________ is a chemical substance which alters the speed of a chemical reaction.

रिकाम्या जागा भरा

Catalyst is a chemical substance which alters the speed of a chemical reaction.

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पाठ 10: Changes around us - Exercises [पृष्ठ १११]

पाठ 10 Changes around us
Exercises | Q II. 5. | पृष्ठ १११

How do the following help in bringing about a chemical change?

pressure.

Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.

Name affects the acidified K₂Cr₂O₇ paper and also turns lime water dirty milky.

What do you observe when HCI is passed through a silver nitrate solution.

Give a chemical test to distinguish between the following gases.

NH₃ and HCl

Select the correct answer from the options given below:

State the gaseous product formed, when

An ammonium salt reacts with an alkali.

______ is not a chemical change.

Explain the following statement: Digestion is a chemical change.

A chemical change may involve –

______ occurs in the absence of air and in the presence of micro-organisms such as yeast.