Chemistry - Questions and Answers, General Study (GK)

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61.

Which among the following is a chemical change?

(a)A wet towel dries in the sun

(b)Lemon juice added to tea causing its color to change

(c)Hot air rises over a radiator

(d)Coffee is brewed by passing steam through ground coffee

Comment

Answer is: DNA

62.

In which one of the following situations a chemical reaction does not occur?

(a)Common salt is exposed to air

(b)Coal is burnt in air

(c)Sodium is placed in water

(d)Iron is kept in moist air

Comment

Answer is: ANA

63.

A fan produces a feeling of comfort during hot weather, because

(a)our body radiates more heat in air

(b)fan supplies cool air

(c)conductivity of air increases

(d)our perspiration evaporates rapidly

Comment

Answer is: DNA

64.

In the pressure cooker, cooking is faster because the increase in vapour pressure

(a)increases the specific heat

(b)decreases the specific heat

(c)decreases the boil point

(d)increases the boiling point

Comment

Answer is: DNA

65.

A close bottle containing water at room temperature was taken to the moon and then the lid is opened. The water will

(a)freeze

(b)boil

(c)decompose into oxygen and hydrogen

(d)not change at all

Comment

Answer is: BNA

66.

Combustion of a candle is

(a)physical change

(b)reduction reaction

(c)endothermic reaction

(d)exothermic reaction

Comment

Answer is: ANA

67.

The depolarization in a primary cell is used for the purpose of

(a)increasing the life of the cell

(b)increasing the emf of the cell

(c)removing the hydrogen collected at one of the plates

(d)removing the dipoles from the electrolytes

Comment

Answer is: BNA

68.

When two plates of different metals are placed in an electrolyte, the developed emf between them depends on

(a)the type of electrolyte

(b)distance between the plates

(c)position of the two metals in the electrochemical series

(d)All of the above

Comment

Answer is: BNA

69.

The internal resistance of a dry cell is

(a)equal to that of electrolytic cell

(b)smaller than that of electrolytic cell

(c)higher than that of electrolytic cell

(d)zero

Comment

Answer is: CNA

70.

Which one among the following metals is more reactive than hydrogen?

(a)Mercury

(b)Copper

(c)Silver

(d)Tin

Comment

Answer is: DNA

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Chemistry - Questions and AnswersPage 7

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