A small amount of $C u S O_{4}$ , $N a O H$ and $N a C l$ was added to water present in beakers A, B and C respectively. The temperature of beaker A and B increases, while that of beaker C decreases. The correct statement(s) is/are:
(i) in beakers A and B, endothermic process has occurred
(ii) in beakers A and B, exothermic process has occurred
(iii) in beaker C, exothermic process has occurred
(iv) in beaker C, endothermic process has occurred

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Important Questions on Chemical Reactions and Equations

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 1 - Chemical Reactions and Equations>Value Based Questions>Q 39

Silver Bromide on exposure to sunlight turns grey due to:

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 1 - Chemical Reactions and Equations>Value Based Questions>Q 40

The gases which can be used for storage of fresh sample of oil are:

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 1 - Chemical Reactions and Equations>Value Based Questions>Q 41

When a solution of barium chloride in water is added to an aqueous solution of sodium sulphate, the following happens:

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 1 - Chemical Reactions and Equations>Value Based Questions>Q 42

Rahul took some zinc granules in a test-tube and added dilute

H C l

to it. He observed that the colour of zinc granules changed to

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 1 - Chemical Reactions and Equations>Value Based Questions>Q 43

Iron sulphate crystals on heating shows the evolution of gas which:

EASY

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 1 - Chemical Reactions and Equations>Value Based Questions>Q 44

On keeping iron nails in copper sulphate solution for two hours, the colour of solution changes:

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF CHEMISTRY X>Chapter 1 - Chemical Reactions and Equations>Value Based Questions>Q 45

Four students were asked to study the reaction between aqueous solutions of barium chloride and sodium sulphate. On mixing the solutions of the two salts in a test tube, they reported their experiment as follows:
$(i)$ the colour of the mixture becomes brown
$(ii)$ the solutions form separate layer
$(iii)$ a colourless mixture is obtained
$(iv)$ a white substance settles at the bottom