SMATEE TEST SERIES 9 CHEMISTRY

1. The shape of XeO₂F₂ molecule is

a) Octahedral
b) Square planar
c) Tetrahedral
d) Trigonal bipyramidal

2. What is the Geometry of SF4 (excluding the lone pair of electrons)

a) T shape
b) See saw
c) Tetrahedral
d) Trigonal bipyramidal

3. Which of the following molecule does not contain unpaired electrons ?

a) N₂⁺
b) O₂^2-
c) B₂
d) O₂

4. Which of the following pair of species have the same bond order ?

a) O₂, NO⁺
b) CN^–, CO
c) CO, NO
d) N₂, O₂^–

5. Maximum number of electrons in a subshell with l=2, n=3 is

a) 8
b) 10
c) 18
d) 32

6. The following quantum numbers are possible for how many orbitals
n=3, l=2, m_l =0

a) 1
b) 2
c) 3
d) 5

7. Choose the incorrect statements about Cathode Rays

a) Cathode Rays Travel in a straight line
b) They are not visible
c) It Produce mechanical effect
d) It depend upon the nature of electrodes.

8. Two electrons occupying the same orbitals are distinguished by

a) Principal quantum numbers
b) Azimuthal quantum numbers
c) Magnetic quantum numbers
d) Spin quantum numbers.

9. The bond strength is maximum in

a) O₂⁺
b) O₂^–
c) O₂^2-
d) O₂

10. The K_p expression for the reactions CaCO₃ (s) ⇌ CaO (s) + CO₂ (g) and N₂ (g) + 3H₂ (g) ⇌ 2NH₃ (g) in terms of K_c are respectively

a) Kp = Kc (RT)-2 and Kp = Kc RT
b) Kp = Kc RT and Kp = Kc (RT)-2 
c) Kp = Kc and Kp = Kc RT
d) Kp = Kc RT and Kp = Kc

11. If K₁ and K₂ are the equilibrium constant for the two reactions A + B ⇌ C + D and  C + D ⇌ E + F respectively. What will be the equilibrium constant (K₃) when the two reactions are added?

a) K₃ = K₁ + K₂
b) K₃ = K₁ – K₂
c) K₃ = K₁/K₂
d) K₃ = K₁.K₂

12. For reaction 2NOCl (g) ⇌ 2NO (g) + Cl₂ (g), K_c at 427⁰C is 3 x 10^-6 L mol^-1. The value of K_p is nearly: (R = 0.0821)

a) 7.5 x 10^-6
b) 2.5 x 10^-5
c) 1.72 x 10^-4
d) 2.5 x 10^-4

13. In which of the following equilibrium K_c and K_p are not equal ?

a) 2NO (g) ⇌ N₂ (g) + O₂ (g)
b) SO₂ (g) + NO₂ (g) ⇌ SO₃ (g) + NO (g)
c) H₂ (g) + I₂ (g) ⇌ 2HI (g)
d) 2C (g) + O₂ (g) ⇌ 2CO₂ (g)

14. In the following equilibrium reaction 2A ⇌ B + C, the equilibrium concentrations of A, B and C are 1 x 10^-3 M, 2 x 10^-3 M and 3 x 10^-3 M respectively at 300 K. The value of K_c for this equilibrium at the same temperature is

a) 1/6
b) 6
c) 1/36
d) 36

15. What is the pH of 10^-7 M H₂SO₄?

a) 4.7
b) 5.7
c) 6.7
d) 7.7

16. What is the pH of solution obtained by dissolving 0.1 mol of CH₃COONa in water to get 100 L of solution? Take K_a of CH₃COOH as 2 x 10^-5

a) 6.42
b) 7.84
c) 8.42
d) 10.24

17. Which of the following favours backward reaction in a chemical equilibrium?

a) Increasing concentration the product
b) Increasing concentration of the reactant
c) Removal of at least one of the products at regular intervals
d) Increasing the pressure

18. Which of the following is most stable carbocation?

a) Ph₂CH⁺
b) PhCH₂⁺
c) Ph₃C⁺
d) Ph⁺

19. Aniline is purified by

a) Extraction with solvent
b) Steam distillation
c) Vacuum distillation
d) Sublimation.

20. Which of the following hybridization has maximum s-character?

a) sp
b) sp₂
c) sp₃
d) All have same s-character