Chemistry Class 12 Questions

 📝Chemistry Class 12 Questions

Multiple Choice Questions 

1. The number of atoms in a body-centered cubic (bcc) unit cell of a monoatomic elementary substance is equal to

(A) 1 
(B) 2
(C) 3 
(D) 4

Ans: (B)

2. Molarity of an aqueous solution containing  40g of `NaOH` in two litre of solution is

(A) 0.5 

(B) 1.0

(C) 1.5 

(D) 0.75

Ans: (A)

3.  `2CH_3Br + 2Na overset{dry  ether}{rightarrow} CH_3-CH_3 + 2NaBr`

The reaction is :

(A) Friedel crafts reaction

(B) Wurtz reaction

(C) Fittig reaction

(D) Wurtz Fittig reaction

Ans: (B)

4. When aqueous solution of `NaCl` is electrolysed the product obtained at cathode is

(A) Hydrogen 

(B) Sodium metal

(C) Oxygen 

(D) Chlorine

Ans: (A)

5. Which of the following is ore of iron

(A) Haematite 

(B) Cassiterite

(C) Dolomite 

(D) Bauxite

Ans: (A)

6. The most stable hydride of group 15 elements is

(A) `NH_3` 

(B) `PH_3`

(C) `AsH_3` 

(D) `SbH_3`

Ans: (A)

7. Which of the following is not a transition element

(A) Fe 

(B) Mn

(C) Cr 

(D) Zn

Ans: (D)

8.