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Introduction to Sulphuric Acid

Setting of ce...

Question

Setting of cement is an example of:

A

Exothermic reaction

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B

Precipitation reaction

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C

Endothermic reaction

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D

Physical change

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Solution

The correct option is A
Exothermic reaction

A large amount of heat is evolved during the setting of cement.

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Q. Fill in the blanks to say whether the following changes are 'reversible' or irreversible':
1. A change which cannot be reversed is called ............................... .
2. Setting of cement is an example of a ............................... change.
3. Absorption of water by a sponge is an example of a ............................... change.
4. Cooking of food represents ............................... change.
5. Digestion of food is a ............................... change.

Q. Write example for each of the following
a) change in colour
b) change in temperature
c) Formation of precipitate.

Example of a reaction in which change of state and formation of precipitate occur simultaneously

Q. (a) What is meant by chemical reaction? Explain with the help of an example.
(b) Give one example each of a chemical reaction characterised by:
(i) evolution of a gas
(ii) change in colour
(iii) formation of a precipitate
(iv) change in temperature
(v) change in state.

Q. A quick-setting cement has an initial setting time of about

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