Free CBSE Class 10 Science Chemical Reactions and Equations Worksheets

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Sample CBSE Class 10 Science Chemical Reactions and Equations Worksheet Questions

1.

When does any chemical reaction takes place ?

1.

When entropy is minimum

2.

Free energy is minimum

3.

When temperature max

4.

When reaction balances both side 

2.
  • Which of the statements about the reaction below are correct when it has been balanced?

MnO2 + Al → Al2O3 + Mn

(a) coefficient of MnO2  is 3.

(b) Coefficient of Al is 3.

(c) Coefficient of Mn is 3.

(d) Coefficient of Al2O3  is 2.

1.

(a) and (b)

2.

(a) and (c)

3.

(a), (b) and (c)

4.

.(a), (c) and (d)

3.

The oxide of nitrogen N2O5 do not contain N-N bond

1. True 2. False
4.
How does the food becomes rancid?
5.
What happens when dilute hydrochloric acid is added to iron fillings?
6.
Write the characteristic tests for hydrogen gas.
7.
Fill in the blanks: When a green iron salt is heated strongly its colour changes to black and odour of burning sulphur is given out. The iron salt is ____________
8.
State TRUE/FALSE: The decomposition of vegetable matter into compost is an example of an exothermic reaction.
1. TRUE 2. FALSE
9.
State TRUE/FALSE: Sublimation of dry ice is an exothermic process.
1. TRUE 2. FALSE
10.
State TRUE/FALSE: pH range of acid is more than 7.
1. TRUE 2. FALSE

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