RRB GROUP D Chemistry Quiz

Question 1:

Evaporation is-

Phenomenon of change of a solid into vapours at any temperature below its boiling point is called evaporation.

Phenomenon of change of a liquid into solid at any temperature below its boiling point is called evaporation.

Phenomenon of change of a liquid into vapours at any temperature below its boiling point is called evaporation.

Phenomenon of change of a liquid into vapours at any temperature at its boiling point is called evaporation.

Question 2:

To a test tube A , that contains Fe⁺³ ions , sodium hydroxide solution was added. What would be observed?

White gelatinous ppt is observed

White ppt is obtained

Pale blue ppt is obtained

Reddish brown ppt is appeared

Question 3:

The atomic mass of Aluminum is 27. The number of moles present in 54 g of Aluminum will be:

2

3

1

4

Question 4:

If 700 mL of H₂ at STP contains x molecules of it, how many molecules of O₂ are present in 700 mL of it at the same temperature and pressure?

x

2x

3x

4x

Question 5:

Three compounds A, B and C are formed when carbon combines with hydrogen. The percentage of hydrogen in A, B, and C are 25, 14.3, and 7.7 respectively. The empirical formulae of the compounds A , B and C are

CH₄ , CH₂ , CH₅

CH₄ , CH₂ , CH

CH₄ , CH₂ , CH₂

CH₄ , CH₂ , CH₃

Question 6:

When we heat lead nitrate in a boiling tube, we observe the emission of brown fumes. Which one of the following is the brown gas ?

NO

N2O2

NO3

NO2

Question 7:

Which of the following metals float on water?

Calcium
Magnesium
Zinc
Lead

1,2

2,3

Only 1

1,2,3

Question 8:

Which of the following can bear a lot of stress?

Nitrogen

Sulphur

Iron

Oxygen

Question 9:

Which of the following oxide is acidic in nature?

Phosphorus trioxide
Sulphur dioxide
Carbon monoxide
Nitric oxide

1,2,3

1,2,4

1,2

2,4

Question 10:

The first element in each period has 1 valence electron and the last element in each period has ________ electrons. ( except Helium).

2 valence electrons

8 valence electrons

4 valence electrons

6 valence electrons

RRB GROUP D Chemistry Quiz - 68

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RRB GROUP D Chemistry Quiz - 68

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