8 Questions
What is the effective water of crystallization for one CaSO4 unit according to the formula provided?
0.5 molecules of water
Why do ionic compounds not conduct electricity in the solid state?
Ions are strongly bound together
What is X in the reaction 2Al + Fe2O3 → Al2O3 + 2Fe?
Aluminum
What process involves heating the ore strongly in the absence or limited supply of air?
Calcination
Why can't zinc oxide be reduced by heating alone?
Zinc oxide is moderately reactive
What metals make up the alloy solder?
Lead and Tin
Why do covalent compounds have low melting and boiling points?
Weak intramolecular forces between molecules
What does the purple color of KMnO4 decolourize into?
Ethanoic acid
Test your knowledge on chemical reactions and equations with these important questions from CBSE exams. Questions cover topics like observations of calcium oxide reaction with water, chemical formula of product formed, and color change of silver chloride in sunlight.
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