NDA CHEMISTRY QUIZ

Question 1:

The element belongs to group 14 and period 2 forms which type of bond?

Metallic bond

Ionic bond

Coordinate bond

Covalent bond

Question 2:

What is the relation between equivalent and molecular weight?

Equivalent weight = $\frac{2\times \text{molecular weight}}{n-factor}$

Equivalent weight = molecular weight$\times$ n –factor

Equivalent weight = $\frac{\text{molecular weight}}{n-factor}$

Equivalent weight = $\frac{n-factor}{\text{molecular weight}}$

Question 3:

________is not a covalent molecule.

Question 4:

In which of the following orbitals is the valence electron of magnesium located?

M orbital

N orbital

L orbital

K orbital

Question 5:

How many electrons are there in the outermost shell of a group 16 element?

5

4

3

6

Question 6:

Which of the following polymers exhibit elasticity?

Neoprene

Bakelite

Nylon -6

PVC

Question 7:

Match the following-

List I	List II
A-Sulphuric acid	I-Weak base
B-Caustic soda	II-Strong acid
C-Ammonium Hydroxide	III-Strong base
D-Carbonic acid	IV-Weak acid

A-II, B-I, C-III, D-IV

A-III, B-II, C-I, D-IV

A-II, B-III, C-I, D-IV

A-II, B-III, C-IV, D-I

Question 8:

Bronze is often used to make medals whereas solder is used for welding electrical wires together. Both bronze and solder are tin containing alloys, yet they are differ in their chemical composition for additionally containing-

Lead in bronze and aluminium in solder

Copper in bronze and lead in solder

Zinc in bronze and aluminium in solder

Iron in bronze and aluminium in solder

Question 9:

Which of the following statements is INCORRECT?

Metals have high melting points.

Metals are good conductors of heat.

Lead and mercury are best conductors of heat.

Pure metals have a shining surface.

Question 10:

In Ammonia compounds the ratio of combining elements is -

1: 8

14 : 3

3 : 8

none of the above

सूची I	सूची II
A- सल्फ्यूरिक अम्ल	I- दुर्बल क्षार
B-कास्टिक सोडा	II- प्रबल अम्ल
C-अमोनियम हाइड्रोक्साइड	III- प्रबल क्षार
D-कार्बोनिक अम्ल	IV- दुर्बल अम्ल