Chemistry - Questions and Answers, General Study (GK)

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171.

During isothermal expansion of an ideal gas, its

(a)Enthalpy reduced to zero

(b)Enthalpy decreases

(c)Internal energy increases

(d)Enthalpy remains unaffected

Comment

Answer is: DNA

172.

Which low if the thermodynamics introduces the concept of entropy?

(a)Second low

(b)Zeroth low

(c)Third low

(d)First low

Comment

Answer is: ANA

173.

Combustion of a candle is

(a)Physical change

(b)Reduction reaction

(c)Endothermic reaction

(d)Exothermic reaction

Comment

Answer is: ANA

174.

When ammonium chloride is dissolved in water, the solution become cold. The change is

(a)Endothermic

(b)Exothermic

(c)Super cooling

(d)None of the above

Comment

Answer is: ANA

175.

Which statement is correct about the fusion of copper?

(a)A solid is formed

(b)Heat is required

(c)The process is exothermic

(d)Heat is released

Comment

Answer is: BNA

176.

The life span of a Daniell cell may be increased by

(a)Larger Zn electrons

(b)Larger Cu electrons

(c)Lowering the temperature

(d)Lowering the concentration

Comment

Answer is: ANA

177.

The electrochemical cell stops working after sometime because

(a)Electrode potential of both the electrodes become zero

(b)One of electrodes completely vanishes

(c)Electrode potential of both electrodes equalizes

(d)The reaction reverses its direction

Comment

Answer is: CNA

178.

The conduction of electricity through the electrolyte solution is due to

(a)Movement of molecule of electrolyte

(b)Movement of ions of electrolyte

(c)Movement of separate atom

(d)Movement of particles of the solvent

Comment

Answer is: BNA

179.

When an acid cell is charged, then

(a)Voltage of cell increases

(b)Resistance of cell increases

(c)Electrolyte of cell dilutes

(d)None of the above

Comment

Answer is: ANA

180.

The advantage of using fuel cell in a motor car could be

(a)Low initial cost

(b)Emission less operation

(c)Light weight

(d)Freedom from refuelling

Comment

Answer is: BNA

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Chemistry - Questions and AnswersPage 18

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