Question

Q26- In which of the given, heat energy will be evolved?
A) Electrolysis of water
B) Dissolution of NH₄Cl in water
C) Burning of L.P.G.
D) Decomposition of AgBr in the presence of sunlight

Q27- Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.
A) The surface of metal becomes shining
B) The reaction mixture turns milky
C) Odour of a pungent smelling gas is recorded
D) A colorless and odourless gas is evolved

Answer 1

Answer:

Q.26

C) Burning of L.P.G.

Fuels release heat on burning. Heat of combustion is total amount of heat released when a fuel is burnt when there is complete combustion with oxygen. It is a chemical reaction in which hydrocarbon is burnt, and it produces carbon dioxide, heat and water.

Q.27

D) A colorless and odourless gas is evolved

Thus, when dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is a colourless and odourless gas evolves with bubbles.

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Answer 2

Answer:

26. c.

27. d.

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