NCERT Solutions for class 11 Chemistry | Chapter : Some Basic Concepts of Chemistry

Questions
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

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

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

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

Answer: Atomicity
6 The significant figures in 3400 are
A 2
B 5
C 6
D 4

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

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

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

Answer: 0.05 M
10 Which of the following cannot give iodometric titrations
A Fe3+
B Cu2+
C Pb2+
D Ag+

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

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

Answer:20 ml
13 The total number of ions present in 111 g of CaCl2 is
A One Mole
B Two Mole
C Three Mole
D Four Mole

Answer:Three Mole
14 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

Answer: 3.0 N
15 Which is not a unit of pressure:
A Bar
B N/m²
C Kg/m²
D Torr

Answer: Kg/m²
16 The -ve charged particles is called:
A Anion
B Cation
C Radical
D Atom

Answer: Anion
17 What is the concentration of nitrate ions if equal volumes of 0.1 M AgNO3 and 0.1 M NaCl are mixed together
A 0.1 N
B 0.2 M
C 0.05 M
D 0.25 M

Answer: 0.2 M
18 The number of moles present in 6 gms of carbon is:
A 2
B 0.5
C 5
D 1

Answer: 0.5
19 Agra is locatApproximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be
A 26.89
B 8.9
C 17.8
D 26.7

Answer: 26.7
20 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

Answer: One mole of sodium

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