Top 500+ TRB Chemistry Model Question Paper with Answers - 1
Question: 1
Efficiency of the catalysts depends on its
(A) Number of free valencies
(B) Molecule state
(C) Amount used
(D) Physical state
Ans: B
Molecule state
Question: 2
Hardness of water is due to the presence of soluble salts in
(A) Sodium and Calcium
(B) Sodium and Lead
(C) Sodium and Magnesium
(D) Calcium and Magnesium
Ans: D
Calcium and Magnesium
Question: 3
An example for substances that undergo physical change is
(A) Burning of paper
(B) Rusting of iron
(C) Burning of coal
(D) Evaporation of water
Ans: D
Evaporation of water
Question: 4
The pH of lemon juice is
(A) 1.0 - 3.0
(B) 2.2 - 2.4
(C) 4.5 - 5.5
(D) 6.5 - 7.5
Ans: B
2.2 - 2.4
Question: 5
An example for chemical change is
(A) Boiling of water of naphthalene
(B) Change of milk into curd
(C) Melting of ice
(D) Evaporation of water
Ans: B
Change of milk into curd
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