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Practice each question, then open the answer or worked solution.
On addition of conc. H2SO4 to a chloride salt, colourless fumes are evolved but in case of an iodide salt, violet fumes come out. This is because
Option (iii) is the answer.
In qualitative analysis when H2S is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO3, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives _________.
Option (ii) is the answer.
In a cyclotrimetaphosphoric acid molecule, how many single and double
bonds are present?
Solution;
Option (iii) is the answer.
Solution coming soon.
Which of the following elements can be involved in pπ–dπ bonding?
Option (iii) is the answer.
Which of the following pairs of ions are isoelectronic and isostructural?
Option (i) is the answer.
Solution coming soon.
Affinity for hydrogen decreases in the group from fluorine to iodine. Which of
the halogen acids should have the highest bond dissociation enthalpy?
Option (i) is the answer.
Bond dissociation enthalpy of E—H (E = element) bonds are given below. Which
of the compounds will act as the strongest reducing agent?
| Compound
∆diss (E—H)/kJ mol–1 |
NH3
389 |
PH3
322 |
AsH3
297 |
SbH3
255 |
Option (iv) is the answer.
On heating with concentrated NaOH solution in an inert atmosphere of CO2, white phosphorus gives a gas. Which of the following statement is incorrect about the gas?
Option (iii) is the answer.
Which of the following acids forms three series of salts?
Option (iii) is the answer.
Strong reducing behaviour of H3PO2 is due to
Option (iii) is the answer.
Solution coming soon.