Some Basic Concepts of Chemistry Quiz | Some Basic Concepts of Chemistry Objective Type Questions and Answers

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Questions
21 What volume 0.8 M solution contains 0.1 mole of solute?
A 100 mL
B 125 mL
C 500 mL
D None of these

Answer: 125 mL
22 Naturally occurring thallium consists of two stable isotopes, Tl-203 and Tl-205 (atomic mass = 203.0 and 205.0, respectively) and has an average atomic mass of 204.4. What is percentage of Tl – 205?
A 14.0%
B 30.0%
C 70.0%
D None of these

Answer: 70.0%
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23 Total mass of 1 mole of CO2 + 10 g mole of O2 + 5 g molecule of SO3 + 5 g atom of Na + 10 g of SO3 + 5 g of Na atom
A 764 g
B 879 g
C 894 g
D None of these

Answer: 894 g
24 Four containers of 2 L capacity contains dinitrogen as described below. Which one contains maximum number of molecules?
A 2.5 g molecule of N2
B 4 g atom of nitrogen
C 82 g of dinitrogen
D None of the above

Answer: 82 g of dinitrogen
25 Which of the following represents 1 g mole of the substance
A 6.02  1023 molecules of NH3
B 4 g of He
C 56 g of CaO
D None of these

Answer: 4 g of He
26 The maximum volume of STP is occupied by
A 1 g molecule of CO2
B 1 g of CO2 of molecule
C 44.5 g of CO2
D None Of The Above

Answer: 44.5 g of CO2
27 one gram atom of Nitrogen atom corresponds to
A NA molecules of N2
B 11.2 L of N2 at STP
C 14 g of N2
D 22.4 L of N2 at STP

Answer: 11.2 L of N2 at STP
28 The number of moles of oxygen in 1 L of air containing 21% oxygen by volume, in standard conditions, is
A 0.186 mol
B 0.21 mol
C 0.0093 mol
D None of these

Answer: 0.0093 mol
29 4 g of an unknown gas occupies 2.24 L of volume at Standard temperature and pressure. The gas may be
A Carbon dioxide
B Carbon monoxide
C Oxygen
D Sulphur dioxide

Answer: Carbon dioxide
30 In a mole of water vapours at STP, the volume actually occupied or taken by the molecules (i.e., Avogadro’s No. x volume of one molecule) is
A Zero
B Less than 1% of 22.4 L
C About 10% of the volume of container
D 1% to 2% of 22.4 L

Answer: 1% to 2% of 22.4 L
31 The mass of 112 cm3 of CH4 gas at STP is
A 0.16 g
B 0.8 g
C 0.08 g
D 1.6 g

Answer: 0.08 g
32 32 g O2, 2 g H2 and 28 g N2 at STP occupy separately a volume of
A 1 L
B 2 L
C 22.4 L
D None of the above

Answer: 22.4 L
33 Which of the following contains maximum number of molecules?
A 100 cc of CO2 at STP
B 150 cc of N2 at STP
C 50 cc of SO2 at STP
D 150 cc of O2 at STP

Answer: 50 cc of SO2 at STP
34 The maximum number of molecules is present in
A 10 g of O2 gas
B 15 L of H2 gas at STP
C 5 L of N2 gas at STP
D none of these

Answer: 15 L of H2 gas at STP
35 An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is:
A Five
B Four
C Three
D Two

Answer: Two
36 How many atoms are contained in one mole of sucrose (C12H22OH)?
A 45  6.02  1023 atoms/mole
B 5  6.62  1023 atoms/mole
C 5  6.02  1023 atoms/mole
D None of these

Answer: 45  6.02  1023 atoms/mole
37 The largest number of molecules is in
A 34 g of water
B 28 g of CO2
C 46 g of CH3COH
D 54 g of N2O5

Answer: 34 g of water
38 One mole of CO2 contains
A 6.02  1023 atoms of C
B 6.02  1023 atoms of O
C 18.1  1023 molecules of CO2
D 3 gram of carbon

Answer: 6.02  1023 atoms of C
39 How many molecules are present in one gram of hydrogen?
A 6.02  1023
B 3.01  1023
C 2.5  1023
D 1.5  1023

Answer: 3.01  1023
40 0.2 mole of HCl and 0.2 mole of barium chloride were dissolved in water to produce a 500 mL solution. The molarity of the Cl– ions is:
A 0.06 M
B 0.09 M
C 1.2 M
D None Of The Above

Answer: 1.2 M

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