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Multiple Choice Questions

1. Mark the rule which is not correctly stated about the determination of significant figures.

2. The reference standard used for defining atomic mass is

3. What will be the standard molar volume of He, if its density is 0.1784 g/L at STP?

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

5. With the increase in temperature, which of these changes?

6. Which of the following statements indicates that the law of multiple proportions is being followed?

7. A mixture of gases contains H and O2 gases in the ratio of 1: 4 (w/w). What is the molar ratio of the two gases in the mixture?

H2   O2

8. The percentage weight of Zn in white vitriol [ ZnSO4.7H2O] is approximately equal to (Zn = 65,S = 32,O = 16 and H = 1).

9. One mole of any substance contains $$6.022 × 10^{23}$$atoms/molecules. The number of molecules of $$H_2SO_4$$ present in 100 mL of 0.02 M $$H_2SO_4$$solution is……..

10. In order to prepare a one-litre normal solution of KMnO4, how many grams of $$KMnO_4$$ is required if the solution is to be used in the acid medium for oxidation?

Total of 10 multiple-choice questions. All the questions cover the entire chapter Structure of atom.

1. If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that of the normal ground state configuration $$1s^22s^22p^3$$, because the electrons would be closer to the nucleus. Yet $$1s^7$$ is not observed because it violates.

2. Which of the following conclusions could not be derived from Rutherford’s α-particle scattering experiment?

3. Based on equation E = – 2.178 × $$10^{-18} J(z^2/n^2)$$, certain conclusions are written. Which of them is not correct?

4. Two electrons occupying the same orbital are distinguished by

5. The electrons identified by quantum numbers n and l :
(A) n = 4, l = 1      (B) n = 4, l = 0
(C) n = 3, l = 2      (D) n = 3, l = 1

can be placed in order of increasing energy as :

6. The number of radial nodes of 3s and 2p orbitals are respectively

7. In which of the following the amount of deviation from
their path in the presence of electric and magnetic field will
be maximum?

8. What will be the difference between electromagnetic radiation shown in A and B respectively?

(i) Velocity              (ii) Wavelength
(iii) Frequency        (iv) Energy

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