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Class 10 Science Chemical Reactions Quiz

8 Questions

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Class 10 Science Chemical Reactions Quiz

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Questions and Answers

What is the effective water of crystallization for one CaSO4 unit according to the formula provided?

0.5 molecules of water (correct)

2 molecules of water

1.5 molecules of water

1 molecule of water

Why do ionic compounds not conduct electricity in the solid state?

Ions are strongly bound together (correct)

Ions are free to move

Ions do not exist in solid ionic compounds

Ions are too large to conduct electricity

What is X in the reaction 2Al + Fe2O3 → Al2O3 + 2Fe?

Iron

Zinc

Aluminum (correct)

Oxygen

What process involves heating the ore strongly in the absence or limited supply of air?

Calcination (A) Signup and view all the answers

Why can't zinc oxide be reduced by heating alone?

Zinc oxide is moderately reactive (A) Signup and view all the answers

What metals make up the alloy solder?

Lead and Tin (D) Signup and view all the answers

Why do covalent compounds have low melting and boiling points?

Weak intramolecular forces between molecules (A) Signup and view all the answers

What does the purple color of KMnO4 decolourize into?

Ethanoic acid (D) Signup and view all the answers