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2021 Paper - II Chemistry
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120
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180 mins
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Combined Medical Services Examination - Previous Year Papers
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PYP
2021 Paper - II Chemistry
Combined Geo-Scientist (P) Examination 2021
Paper-II (Chemistry)
The number of radial nodes for 2s, 3p and 3d orbitals, respectively are:
PYP
2021 Paper - II Chemistry
What fraction of the total number of electrons is in the p-sublevels in Iron (Fe)?
PYP
2021 Paper - II Chemistry
Which is the correct order of degree of hydration among the following ions?
PYP
2021 Paper - II Chemistry
Consider the following statements regarding diagonal relationship of ‘B’ and ‘Si’:
1. The electronegativity values of both the elements are almost same
2. Both the elements have almost identical values of their ionic potential
Which of the statements given above is/are correct?
PYP
2021 Paper - II Chemistry
Consider the following statements regarding Lanthanum:
1. It is a f-block element
2. It is an inner transition element
3. It is a transition series element
4. It is a rare earth metal
Which of the statements given above are correct?
PYP
2021 Paper - II Chemistry
Argon (Ar) is used in arc welding because of its:
PYP
2021 Paper - II Chemistry
Which one of the following represents the correct order of ionic radii among K+, S2-, Cl- and Ca2+?
PYP
2021 Paper - II Chemistry
The dipole moments of H0C0C0Cl, CO and HCl are in the directions:
PYP
2021 Paper - II Chemistry
Consider the following pairs of species of oxygen and their magnetic behavior:
1. O2-, O2 2- 14 Both diamagnetic
2. O2+, O2 2- 14 Both paramagnetic
3. O2+, O2- 14 Both paramagnetic
4. O, O2 2- 14 Both paramagnetic
Which of the pair(s) of oxygen species given above represents the correct magnetic behavior?
PYP
2021 Paper - II Chemistry
Consider the following statements regarding the properties of Nitric oxide (NO):
1. Nitric oxide gas is paramagnetic but liquid nitric oxide is diamagnetic
2. Nitric oxide gas is diamagnetic but liquid nitric oxide is paramagnetic
3. Nitric oxide is a neutral oxide and is not an acid anhydride
Which of the statement(s) given above is/are correct?
PYP
2021 Paper - II Chemistry
Which one of the following substances has the greatest ionic character?
PYP
2021 Paper - II Chemistry
Consider the following statements regarding Madelung constant:
Statement-1: Madelung constant typically increases with coordination number
Statement-2: Large contribution towards Madelung constant comes from nearest neighbors, and such neighbors are more numerous when coordination number is large
Which one of the following is correct in respect of above statements?
PYP
2021 Paper - II Chemistry
Which one of the following represents the correct order of melting point among BeCl2, MgCl2, CaCl2 and NaCl?
PYP
2021 Paper - II Chemistry
What kind of defect(s) appear in AgBr crystal?
PYP
2021 Paper - II Chemistry
Consider the following statements:
1. N2 molecule is paramagnetic
2. O2 molecule is diamagnetic
3. CO+ has more bond order than CO
4. NO+ has less bond order than NO
Which of the statement(s) given above is/are correct?
PYP
2021 Paper - II Chemistry
The correct order of the bond angles among NH3, NH4+ and NH2- is:
PYP
2021 Paper - II Chemistry
Consider the following statements:
Statement-1: KO2 is paramagnetic
Statement-2: The super oxide O2- is paramagnetic because it has one unpaired electron in π* 2p molecular orbital
Which one of the following is correct in respect of above statements?
(a) Both statement-1 and statement-2 are true and statement-2 is the correct explanation of statement-1
(b) Both statement-1 and statement-2 are true but statement-2 is not the correct explanation of statement-1
(c) Statement-1 is true but statement-2 is false
(d) Statement-1 is false but statement-2 is true
PYP
2021 Paper - II Chemistry
Which one of the following is NOT a resonance structure of cyanate (OCN−)?
(a) :Ö═C≡N:
(b) :Ö−─C≡N:
(c) :Ö+≡C─N:2−
(d) :Ö═C─N−:
[IMAGE]
PYP
2021 Paper - II Chemistry
What are the spin only magnetic moments (in BM) for Ni (II) ion in a square planar and octahedral geometry, respectively?
(a) 0 (zero) and 2.83
(b) 2.83 and 0 (zero)
(c) 2.83 and 2.83
(d) 0 (zero) and 0 (zero)
PYP
2021 Paper - II Chemistry
Which one of the following complexes is tetrahedral as well as diamagnetic?
(a) [Ni(NH3)4]2+
(b) [NiCl4]2−
(c) [Ni(CO)4]
(d) [Ni(CN)4]2−
PYP
2021 Paper - II Chemistry
Which one of the following will NOT precipitate AgCl while reacting with excess of AgNO3 solution at room temperature?
(The oxidation state of cobalt (Co) in all the complexes is +3)
(a) CoCl3.6NH3
(b) CoCl3.5NH3
(c) CoCl3.4NH3
(d) CoCl3.3NH3
PYP
2021 Paper - II Chemistry
Which one of the following complexes CANNOT be ionized in solution?
PYP
2021 Paper - II Chemistry
The maximum denticity of the polydentate ligand tetraethylene pentamine is equal to:
PYP
2021 Paper - II Chemistry
The correct IUPAC name of K2[Zn(OH)4] is:
PYP
2021 Paper - II Chemistry
Which one of the following octahedral complexes does NOT show geometrical isomerism? ('A' and 'B' are monodentate ligands)
PYP
2021 Paper - II Chemistry
Which one of the following will NOT show optical isomerism?
PYP
2021 Paper - II Chemistry
How many isomers are possible for [Co(en)2Cl2]+ complex ion?
PYP
2021 Paper - II Chemistry
Which one of the following equilibria will shift to the left in response to increase in pressure?
PYP
2021 Paper - II Chemistry
The correct order of the acidic strength of H3PO4, H3PO3 and H3PO2 is:
PYP
2021 Paper - II Chemistry
Which one of the following substances has highest proton affinity?
PYP
2021 Paper - II Chemistry
An aqueous solution of HN3 was diluted two times, three times, four times and five times using required amount of water. Considering ‘α’ to be the ionization constant and ‘V’ as the final volume of diluted solution, choose the correct answer from the following:
PYP
2021 Paper - II Chemistry
Which one of the following represents the correct order of acidity of water and alcohols?
PYP
2021 Paper - II Chemistry
A student calculated the pH of 10⁻7 M NaOH solution and 10⁻8 M HCl solution to be 7 and 8, respectively. To verify, the student performed experiment in laboratory using pH-meter. The instrument displays the pH of former and later solutions as 7.3 and 6.9, respectively. Choose the correct answer from the following:
PYP
2021 Paper - II Chemistry
Which one of the following has the pH value NOT equal to one?
PYP
2021 Paper - II Chemistry
What will be the pH of a buffer solution containing 0.20 mole of NH4OH and 0.25 mole of NH4Cl per litre? (Dissociation constant of NH4OH at room temperature is 1.81 × 10−5, log1.81 = 0.2577 and log1.25 = 0.0969)
PYP
2021 Paper - II Chemistry
The molarity of concentrated commercial HCl with 36 % (w/w) HCl and density 1.19 g/cm3 is close to:
PYP
2021 Paper - II Chemistry
Which one of the following primary standard is usually used to standardize KOH by titration?
PYP
2021 Paper - II Chemistry
While performing the titration between Mohr’s salt solution and potassium dichromate solution using diphenylamine as indicator, a student forgot to add o-phosphoric acid. Choose the correct answer from the following:
PYP
2021 Paper - II Chemistry
Consider following statements in respect of titration between Ca2+ solution and EDTA solution using Eriochrome Black T as indicator (In):
1. The end point will be red in color
2. The end point will be blue in color
3. The end point depends on pH of solution which is controlled by adding ammonia –ammonium citrate buffer
4. The end point is observed since metal–In complex is more stable than metal–EDTA complex
Which of the statement(s) given above is/are correct?
PYP
2021 Paper - II Chemistry
In acid base titration the color change of an indicator is expressed by:
pH = pK'ln + log [In_B]/[In_A]
(Where In_B = Indicator in the basic form, In_A = indicator in acid form)
The basic color of the indicator would be visible when:
PYP
2021 Paper - II Chemistry
Which one of the following comparisons of the average translational kinetic energy (K.E.) and the average molecular speeds of H2 and N2 gases at 300 K is correct?
Average translational K.E. Average molecular speed
PYP
2021 Paper - II Chemistry
The expression of isothermal compressibility factor is:
PYP
2021 Paper - II Chemistry
An equimolar mixture of H2 and N2 is allowed to effuse through a hole. What is the ratio of rate of diffusion of H2 to that of N2?
(M.W. of H2 = 2 g mol−1 and M.W. of N2 = 28 g mol−1)
PYP
2021 Paper - II Chemistry
The temperature at which the average velocity of Nitrogen (N2) is equal to that of Oxygen (O2) at 320 K is:
(M.W. of N2 = 28 g mol−1 and M.W. of O2 = 32 g mol−1)
PYP
2021 Paper - II Chemistry
Which one of the following relations for three types of velocities is true for oxygen gas at 300 K? (where ⟨c2⟩1⁄2 = root mean square velocity; ⟨c⟩ = average velocity; cp = most probable velocity)
PYP
2021 Paper - II Chemistry
Consider the following statements regarding the most probable speed of gas particles:
1. The most probable speed increases with increasing temperature and with decreasing molar mass and simultaneously distribution becomes broader
2. The most probable speed increases with increasing temperature and with increasing molar mass and distribution becomes sharp
3. The most probable speed decreases with the decrease of temperature and with increasing molar mass and simultaneously distribution becomes sharp
Which of the statement(s) given above is/are correct?
PYP
2021 Paper - II Chemistry
One hundred molecules of Oxygen (O2) escape through a small hole on a container at a pressure of 1 torr and temperature of 300 K per second to vacuum. The number of hydrogen molecules that would escape per second through the same hole under the same conditions of temperature and pressure is: (M.W. of O2 = 32 g mol−1 and M.W. of H2 = 2 g mol−1)
PYP
2021 Paper - II Chemistry
The mean free path of a gas is:
PYP
2021 Paper - II Chemistry
Which one of the following is NOT a Maxwell thermodynamic relation?
PYP
2021 Paper - II Chemistry
Consider the following first order elementary reaction:
A(g) <===> B(g) with forward rate constant K1 and backward rate constant K2
The half-life period of the forward reaction is 10 min. and that of the backward reaction is 1 min. What is the value of equilibrium constant for the above reaction?
PYP
2021 Paper - II Chemistry
Consider the following figure representing the increase in entropy of a substance from absolute zero to its gaseous state with temperature change:
ΔS° (fusion) and ΔS° (vaporization) are respectively indicated by:
[IMAGE]
PYP
2021 Paper - II Chemistry
Consider the following quantities:
1. Concentration
2. Volume
3. Standard electrode potential
4. Internal energy
Which of the following statements given below are correct?
PYP
2021 Paper - II Chemistry
Joule Thomson coefficient for a gas is given by:
PYP
2021 Paper - II Chemistry
Consider the following statements regarding Joule Thomson effect:
1. Joule Thomson effect occurs at constant enthalpy
2. For perfect gas Joule Thomson coefficient is zero
3. Heating effect corresponds to positive value of Joule Thomson coefficient
Which of the statements given above is/are correct?
PYP
2021 Paper - II Chemistry
For the reaction H2F2(g) → H2(g) + F2(g), ΔH is equal to:
PYP
2021 Paper - II Chemistry
Which of the following thermodynamic relations are correct?
1. Lim T → 0 S = 0
2. ST = ∫0T Cp dT / T
3. -ΔS = (∂(ΔG)/∂T)P
Select the correct answer using the code given below:
PYP
2021 Paper - II Chemistry
What is the sign of ΔG° and the value of K for an electrochemical cell for which E°cell = 0.80V?
PYP
2021 Paper - II Chemistry
If 94G = 94H 013 T94S and 94G = 94H + T \left( \delta(\u0394G)/\delta T \right)ₚ then the variation of emf of cell (Ed) with temperature T at constant pressure is given by:
PYP
2021 Paper - II Chemistry
Which of the following is correct about the sign of enthalpy and entropy changes of an evaporating liquid?
PYP
2021 Paper - II Chemistry
Consider the following equilibrium process at 373K and 1 atm. pressure:
H2O(l) 1414141414141414 H2O(g)
Which one of the following relations is true for the above process?
PYP
2021 Paper - II Chemistry
Which one of the following aqueous solutions has the lowest vapor pressure at room temperature?
PYP
2021 Paper - II Chemistry
Compared to pure water, 1 M sugar-water solution will have a:
PYP
2021 Paper - II Chemistry
The relation between osmotic pressure (Π) and lowering of vapor pressure in an infinitely dilute solution is:
PYP
2021 Paper - II Chemistry
The vapor pressure of ethyl acetate at 293K is 72.8 torr. The vapor pressure of the solution obtained by dissolving 0.4 g of a non-volatile solute (molar mass = 60 gmol⁻1) in 100 g of ethyl acetate at the same temperature is:
PYP
2021 Paper - II Chemistry
People with high blood pressure are advised to have lower intake of salt in their food because:
1. Higher intake of salt causes higher osmotic pressure
2. It results in greater inflow of water in the cells and causes water retention in the tissue cells and intercellular spaces
Which of the statement(s) given above is/are correct?
PYP
2021 Paper - II Chemistry
The equation Π = c2RT is known as:
(where c2 = n2/V is the molar concentration of the solute in the given solution and other symbols have their usual meanings)
PYP
2021 Paper - II Chemistry
The boiling point of Chloroform was raised by 0.325K when 5.141 × 10⁻4 kg of a non-volatile solute was dissolved in 35 × 10⁻3 kg of Chloroform. Calculate the molar mass of the solute?
(molal boiling point elevation constant for chloroform is 3.9 K kg mol⁻1)
PYP
2021 Paper - II Chemistry
P is the total vapor pressure of an ideal binary liquid solution. If yA and yB are the amount fractions of the constituents in vapor phase, then which one of the following statements is correct?
PYP
2021 Paper - II Chemistry
The Henry Law constant (Ki) for Hydrogen (H2) in water at room temperature is 7.03 × 10⁹ Pa. If the pressure of H2 in equilibrium with water is 1.00 × 10⁶ Pa at the same temperature, then the mole fraction of H2 in the solution is:
PYP
2021 Paper - II Chemistry
Specific conductance of a decimolar solution of KCl at 18°C is 1.12 Sm−1. The resistance of a conductivity cell containing the solution at the same temperature was found to be 55 ohm. What is the cell constant?
PYP
2021 Paper - II Chemistry
In acidic medium MnO4− converted to Mn2+. The quantity of electricity in Faraday required to reduce 0.2 mole of MnO4− to Mn2+ would be:
PYP
2021 Paper - II Chemistry
What will be the correct order of mobility of the following ions in aqueous solution at 298 K?
PYP
2021 Paper - II Chemistry
At 291 K the ionic velocities of Ag+ is 0.00057 cm/s and that of NO3− is 0.00063 cm/s. If the specific conductivity of 0.1N AgNO3 solution is 0.00947ohm−1cm−1, then the degree of dissociation at this dilution is:
PYP
2021 Paper - II Chemistry
Plots of equivalent conductance (Λ) vs square root of concentration (√C) of two electrolytes are given below, with Λ0 being the equivalent conductance at infinite dilution:
Which one of the following statements is correct?
[IMAGE]
PYP
2021 Paper - II Chemistry
Consider the following statements for an electrolyte solution which is diluted to approach infinite dilution:
Statement-I: Ion-ion interactions are reduced to effect the increase in conductance
Statement-II: The number of ions gets increased to effect increase in conductance
Which one of the following is correct with respect to above statements?
PYP
2021 Paper - II Chemistry
The value of log γ± in the Debye-Huckel limiting law for a 0.01m KCl solution in water at 25 °C is:
(where γ± is the mean ionic activity coefficient)
PYP
2021 Paper - II Chemistry
Consider the following plot:
The above plot indicates the conductometric titration between:
[IMAGE]
PYP
2021 Paper - II Chemistry
Consider the following plot for conductometric study of a reaction between KCl and AgNO3 solutions:
Cause/s behind the constancy of conductance in the region PQ is/are due to:
[IMAGE]
PYP
2021 Paper - II Chemistry
Consider the following plot for the conductometric titration:
Which one of the following is correct in respect of above plot?
[IMAGE]
PYP
2021 Paper - II Chemistry
Two electrolytes AX and BX were chosen to determine transport number using moving boundary method. It is given that:
I: The cation B+ moves slower than the cation A+
II: The electrolyte BX is denser than AX
Which one of the following is correct?
PYP
2021 Paper - II Chemistry
The total number of delocalized pi-electrons in compounds I and II are:
[IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Rank the following structures in order of increasing contribution to the resonance hybrid:
H3C H3C H3C
CH3-C=N--NH2 CH3-C-N=NH2 CH3-C--N--NH2
I II III
[IMAGE]
PYP
2021 Paper - II Chemistry
Which of the following indicated atoms in each species has sp2-hybridization?
I II III IV
[IMAGE]
PYP
2021 Paper - II Chemistry
The total number of hyperconjugative structures possible for the following carbocation is:
CH3
H3C-C-CH3
|
H-C+
|
CH3
[IMAGE]
PYP
2021 Paper - II Chemistry
Which one of the following statements regarding polarity of bonds is NOT true?
PYP
2021 Paper - II Chemistry
The correct order of the basicity of the following amines is: [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The correct order of stability of the following carbocations is: [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Rank the following compounds in order of their decreasing dipole moment: [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The relationship between the following pair of compounds is: [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Consider the following set of compounds:
Which one of the following statements is NOT true about the above compounds (I–IV)?
[IMAGE]
PYP
2021 Paper - II Chemistry
The correct statement about the following molecule is:
[IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
A sample of lactic acid was found to have an enantiomeric excess (ee) of 14% with respect to R (+) isomer. What is the percentage of S (–) isomer in the sample?
PYP
2021 Paper - II Chemistry
In 2-butanol observed angle of rotation is 1.03°, concentration of sample is 1M and length of sample tube is 10 cm. Specific angle of rotation will be:
PYP
2021 Paper - II Chemistry
The absolute configuration of C2 and C3 in the following compound is:
[IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The configuration of C1 and C2 carbons in the following molecule is:
C6H5
HO 1 H
Cl 2 H
CH2CH3
[IMAGE]
PYP
2021 Paper - II Chemistry
The most stable conformation of the following compound is:
[IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The stereochemical notations for the following compound is:
[IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The total number of geometrical isomers for the following compound is:
[IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The correct order of stability of Newman projections of 1, 2-dichloroethane is:
PYP
2021 Paper - II Chemistry
Among the following, the Newman projections for meso-2,3-butanediol are: [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The major products [X] and [Y] formed in the following reactions are:
[X] H2, Pd / BaSO4 Me=Me Na, NH3 (liq) [Y] [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Which one of the following chlorides undergoes a fastest SN2 reaction with KI in acetone?
(a) [IMAGE] (b) [IMAGE] (c) [IMAGE] (d) [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Indicate the order of reactivity of HX in the following reaction:
ROH + HX RX + H2O
PYP
2021 Paper - II Chemistry
Which isomer of 1,2,3,4,5,6-hexachlorocyclohexane shown below undergoes E2 elimination (dehydrohalogenation) most slowly? [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The following reaction is an example of: [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Which of the following statement is TRUE for the reaction mentioned below? [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Which one of the following alcohols dehydrates the fastest when heated with acid? [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The major product formed in the following reaction is:
[IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Which one of the following alkenes will react most rapidly with concentrated sulphuric acid?
PYP
2021 Paper - II Chemistry
The regioselective electrophilic addition of HOCl with propene proceeds through:
[IMAGE]
PYP
2021 Paper - II Chemistry
Which one of the following products is formed when bromine adds to anthracene?
[IMAGE]
PYP
2021 Paper - II Chemistry
The correct sequence of reactions to accomplish the following transformation is:
[IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
The intermediate [X] and the major product [Y] formed in the following reaction are: [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Which is the major product formed in the reaction of phenol with bromine in carbon disulfide at 0–5°C temperature? [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Which is the major product formed in the reaction of o-chloroanisole with NaNH2 in liquid ammonia at low temperature?
PYP
2021 Paper - II Chemistry
Predict the major product formed in the following reaction: [IMAGE]
[IMAGE]
PYP
2021 Paper - II Chemistry
Consider the following reaction:
The major product ‘P’ of Wagner-Meerwein rearrangement is:
[IMAGE]
PYP
2021 Paper - II Chemistry
The major product formed in the following reaction is:
[IMAGE]
PYP
2021 Paper - II Chemistry
Which one of the following is NOT a characteristic of neighboring group participation effect?
PYP
2021 Paper - II Chemistry
In which of the following solvents the neighboring group rate enhancement by phenyl group in the solvolysis of PhCH2CH2OTs is maximum?
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