Class 11 Chemistry Chapter 1 -Some Basic Concepts of Chemistry Questions and Answers

1 The S.I unit of temperature is :

A Kelvin

B Celsius

C Fahrenheit

D Centigrade

Answer:Kelvin

2 The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO₄.7H₂O. The atomic weight of M is

A 40.3

B 36.3

C 24.3

D 11.3

View Answer

Answer: 24.3

3 Which of the following weighs the most?

A One g – atom of nitrogen

B One mole of water

C One mole of sodium

D One molecule of H₂SO₄

View Answer

Answer:One mole of sodium

4 What is the normality of a 1 M solution of H₃PO₄

A 0.5 N

B 1.0 N

C 2.0 N

D 3.0 N

View Answer

Answer:3.0 N

5 A symbol not only represents the name of the element but also represents

A Atomic Mass

B Atomic Number

C Atomicity

D Atomic Volume

View Answer

Answer: Atomicity

6 The significant figures in 3400 are

A 2

B 5

C 6

D 4

View Answer

Answer: 5

7 Which of the following contains same number of carbon atoms as are in 6.0 g of carbon (C – 12)?

A 6.0 g Ethane

B 8.0 g Methane

C 21.0 g Propane

D 28.0 g CO

View Answer

Answer: 8.0 g Methane

8 The number of moles present in 6 gms of carbon is:

A 2

B 0.5

C 5

D 1

View Answer

Answer: 0.5

9 What is the concentration of nitrate ions if equal volumes of 0.1 MAgNO3 and 0.1 M NaCl are mixed together

A 0.1 M

B 0.2 M

C 0.05 M

D 0.25 M

View Answer

Answer: 0.05 M

10 Which of the following cannot give iodometric titrations

A Fe³⁺

B Cu²⁺

C Pb²⁺

D Ag⁺

View Answer

Answer: Pb²⁺

11 An organic compound contains carbon , hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be

A CHO

B CH₄O

C CH₃O

D CH₂O

View Answer

Answer:CH₃O

12 Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be

A 100 ml

B 20 ml

C 40 ml

D 60 ml

View Answer