Chapter 1: Some Basic Concepts of Chemistry

Two students performed the same experiment separately and each one of

them recorded two readings of mass which are given below. The correct reading

of mass is 3.0 g. Based on given data, mark the correct option out of the

following statements.

Student Readings

A measured temperature on the Fahrenheit scale is 200 °F. What will this reading

be on a Celsius scale?

(i) 40 °C

(ii) 94 °C

(iii) 93.3 °C

(iv) 30 °C

What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per

500 mL?

If 500 mL of a 5M solution is diluted to 1500 mL, what will be the molarity of

the solution obtained?

(i) 1.5 M

(ii) 1.66 M

(iii) 0.017 M

(iv) 1.59 M

The number of atoms present in one mole of an element is equal to Avogadro

number. Which of the following element contains the greatest number of

atoms?

If the concentration of glucose (C₆H₁₂O₆) in the blood is 0.9 g L^-1, what will be the

molarity of glucose in the blood?

(i) 5 M

(ii) 50 M

(iii) 0.005 M

(iv) 0.5 M

What will be the molality of the solution containing 18.25 g of HCl gas in

500 g of water?

(i) 0.1 m

(ii) 1 M

(iii) 0.5 m

(iv) 1 m

One mole of any substance contains 6.022 × 10²³ atoms/molecules. Number

of molecules of H₂SO₄ present in 100 mL of 0.02M H₂SO₄ solution is ______.

(i) 12.044 × 10²⁰ molecules

(ii) 6.022 × 10²³ molecules

(iii) 1 × 10²³ molecules

(iv) 12.044 × 10²³molecules

What is the mass per cent of carbon in carbon dioxide?

(i) 0.034%

(ii) 27.27%

(iii) 3.4%

(iv) 28.7%

The empirical formula and molecular mass of a compound are CH₂O and

180 g respectively. What will be the molecular formula of the compound?

(i) C₉H₁₈O₉

(ii) CH₂O

(iii) C₆H₁₂O₆

(iv) C₂H₄O₂