Chemistry - Section 1 (7)

Directions to Solve

Chemistry - Section 1

49.

The number of waves in n x 10th Bohr's orbit are

A.	n2
B.	n
C.	n-2
D.	n3

Answer: Option B

Explanation:

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50.

The oil used in the froth floatation process is

A.	coconut oil
B.	olive oil
C.	kerosene oil
D.	pine oil

Answer: Option D

Explanation:

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51.

The most malleable metal is

A.	platinum
B.	silver
C.	iron
D.	gold

Answer: Option D

Explanation:

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52.

The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

A.	1.568 x 10 3
B.	6.023 x 10 19
C.	4.84 x 10 17
D.	6.023 x 10 23

Answer: Option B

Explanation:

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53.

The luster of a metal is due to

A.	its high density
B.	its high polishing
C.	its chemical inertness
D.	presence of free electrons

Answer: Option D

Explanation:

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54.

The monomer of polythene is

A.	vinyl chloride
B.	ethylene
C.	ethyl alcohol
D.	None of the above

Answer: Option B

Explanation:

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55.

The main use of salt in the diet is to

A.	make the taste of food better
B.	produce in small amounts the hydrochloric acid required for the digestion of food
C.	ease the process of cooking
D.	increase the solubility of food particles in water

Answer: Option B

Explanation:

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56.

What are the number of moles of CO2 which contains 16 g of oxygen?

A.	0.5 mole
B.	0.2 mole
C.	0.4 mole
D.	0.25 mole

Answer: Option A

Explanation:

One mole of CO2 has mass of 44 g and 32 g of O2. So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.

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