Chemical Reactions And Equations Mock Tests

29 questions available

Chemical Reactions And Equations Mock Test 1

Questions: 29

Sample Questions

Class 10 Science

The reaction of calcium oxide with water to form calcium hydroxide is:

A Endothermic

B Exothermic

C Redox

D Displacement

Class 10 Science

When ethanoic acid is added to sodium bicarbonate powder, brisk effervescence is observed. The gas evolved is:

A hydrogen gas

B carbon dioxide gas

C hydrogen chloride gas

D carbon monoxide gas

Class 10 Science

When dilute hydrochloric acid is added to zinc granules, which of the following is observed?

A The mixture turns blue

B Hydrogen gas is evolved and zinc chloride is formed

C Zinc dissolves and carbon dioxide is evolved

D A precipitate of zinc chloride is formed

Class 10 Science

The reaction between lead nitrate and potassium iodide produces:

A Yellow precipitate of lead iodide

B White precipitate of lead iodide

C Red precipitate of lead iodide

D No reaction occurs

Class 10 Science

When copper sulphate crystals are heated strongly in a test tube, the blue colour changes to white. On adding a few drops of water to the white residue, the blue colour reappears. The correct explanation is:

A copper sulphate decomposes on heating and reforms on adding water

B copper sulphate loses water of crystallisation on heating and regains it on adding water

C copper sulphate oxidises on heating and reduces on adding water

D copper sulphate undergoes a chemical change that is irreversible

Class 10 Science

When sodium carbonate solution is added to a salt solution, a white precipitate is formed. The salt solution contains:

A Iron(III) ions

B Calcium ions

C Lead(II) ions

D Both calcium ions and lead(II) ions

Class 10 Science

Which of the following is a physical change?

A Rusting of iron

B Burning of magnesium

C Dissolving salt in water

D Souring of milk

Class 10 Science

A student adds zinc granules to dilute sulphuric acid in a test tube. Which observation is correct?

A Zinc dissolves and oxygen gas is evolved

B Zinc dissolves and hydrogen gas is evolved

C Zinc dissolves and sulphur dioxide is evolved

D No reaction occurs

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