Question

1. The number of unpaired electrons present in the complex ion [CoCl4]

2− is

A. 3 B. 2

C. 4 D. 0

2. Amongst Na2O, CaO, BaO and ZnO, the amphoteric oxide is

A. Na2O B. ZnO

C. CaO D. BaO

3. The hybridization, geometry and magnetic moment of Na2[Cu(CN)4] respectively,

are

A. sp

3

, tetrahedral, 1.73 B.M. B. sp

3

, tetrahedral, 2.84 B.M.

C. dsp2

, square planar, 1.73 B.M. D. dsp2

, square planar, 2.84 B.M.

4. Reaction of water with aluminium carbide gives a colorless gas. The gas is

A. acetylene B. propene

C. propane D. methane

5. The number lone pairs on the central atom of the following molecules

respectively, are

XeCl2, XeF4, SF4, ClF3

A. 3, 2, 1, 2 B. 2, 3, 1, 2

C. 3, 2, 2, 1 D. 1, 2, 1, 3

6. The most stable isotope of copper and the number of neutrons present in its

nucleus are, respectively

A. 65Cu, 36 B. 63Cu, 34

C.

67Cu, 34 D. 63Cu, 32​

Answer 1

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