JEE CHEMISTRY UNIT 1: SOME BASIC CONCEPTS IN CHEMISTRY
QUIZ NO 3
TOTAL QUESTIONS = 20
1. If 0.5 moles of BaCl₂ are mixed with 0.2 moles of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ that can be formed is
A. 0.3
B. 0.1
C. 0.4
D. 0.2
2. If 1 mole of a gas occupies 22.4 L at STP, what is the volume of 2 moles?
A. 22.4 L
B. 56 L
C. 11.2 L
D. 44.8 L
3. The number of significant figures in 0.00250 is
A. 5
B. 4
C. 3
D. 2
4. Avogadro's number is
A. 6.022 × 10^23
B. 6.022 × 10^22
C. 3.011 × 10^22
D. 3.011 × 10^23
5. The mass percentage of oxygen in H2O is approximately
A. 33%
B. 50%
C. 89%
D. 66%
6. The percentage of nitrogen in NH₃ is
A. 46%
B. 82.35%
C. 14%
D. 17.65%
7. How many molecules are present in 1 mole of oxygen gas?
A. 2.204 × 10^23
B. 6.022 × 10^23
C. 3.011 × 10^23
D. 1.204 × 10^24
8. The number of moles in 44 g of CO₂ is
A. 2
B. 0.5
C. 1
D. 3
9. The molarity of a solution containing 5.85 g of NaCl in 500 mL of solution is
A. 0.2 M
B. 0.1 M
C. 1 M
D. 0.5 M
10. How many significant figures are there in 0.00420?
A. 5
B. 2
C. 4
D. 3
11. The atomic mass of an element is equal to
A. the number of electrons
B. the sum of protons and neutrons
C. the number of protons
D. the number of neutrons
12. An organic compound contains 80% carbon and 20% hydrogen by mass. Its empirical formula is
A. C₃H₈
B. CH₄
C. C₂H₆
D. C₄H₁₀
13. The equivalent weight of H₃PO₄ in the reaction forming H₂PO₄⁻ is
A. 32.7 g/equiv
B. 24.5 g/equiv
C. 98 g/equiv
D. 49 g/equiv
14. For a reaction A + 2B → C, the amount of C formed by starting the reaction with 5 moles of A and 8 moles of B is
A. 5 moles
B. 6 moles
C. 4 moles
D. 8 moles
15. 100 mL of PH₃ on heating forms P₄ and H₂. The volume change in the reaction is
A. an increase of 100 mL
B. an increase of 50 mL
C. a decrease of 50 mL
D. an increase of 150 mL
16. Which of the following has the highest mass percentage of oxygen?
A. CO₂
B. H₂O
C. CH₃OH
D. H₂O₂
17. What is the molecular formula of a compound with empirical formula CH and molar mass 78 g/mol?
A. CH₄
B. C₇H₇
C. C₂H₂
D. C₆H₆
18. A sample of pure compound contains 9 g of aluminum and 35.5 g of chlorine. The empirical formula of the compound is
A. AlCl₂
B. AlCl₃
C. AlCl
D. Al₂Cl₃
19. The mass of 112 mL of NH₃ gas at STP is
A. 0.34 g
B. 0.51 g
C. 0.085 g
D. 0.17 g
20. The limiting reagent in the reaction 2H₂ + O₂ → 2H₂O when 4 g of H₂ reacts with 32 g of O₂ is
A. H₂O
B. H₂
C. O₂
D. none of these
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