Set-1 Set-2 Set-3 Set-4 Set-5

Set 5

1. Consider reaction: Na(s) + O₂(g) → Na₂O(s). Moles of sodium needed to balance equation would be

(A) 1
(B) 2
(C) 3
(D) 4

2. Consider equation: Cu²⁺ (aq) + 2OH^-(aq) → Cu (OH)₂ (s). precipitate of Copper Hydroxide Cu (OH)₂ will be of

(A) Green color
(B) Blue color
(C) Brown color
(D) White color

3. Consider equation: Pb²⁺ (aq) + 2OH^- (aq) → Pb (OH)₂ (s). precipitate of lead (II) hydroxide will be of

(A) Green color
(B) Blue color
(C) Brown color
(D) White color

4. Consider equations: Ca²⁺(aq) + 2OH‾(aq)→Ca (OH)₂ (s). Precipitate of calcium hydroxide will be of

(A) Green color
(B) Blue color
(C) Brown color
(D) White color

5. Color of Solid magnesium is

(A) Dark grey
(B) Silver grey
(C) Black
(D) Whitish silver

6. When carbon dioxide is passed through lime water

(A) Calcium hydroxide is formed
(B) White precipitate of CaO is formed
(C) Lime water turns milky
(D) Color of lime water disappears

7. If magnesium is gently heated, it forms

(A) Magnesium oxide
(B) Magnesium sulfide
(C) Magnesium nitrite
(D) Magnesium carbonate

8. Color of magnesium oxide is

(A) White
(B) Blue
(C) Grey
(D) Pink

9. What chemicals are used in fireworks?

(A) Copper chloride
(B) Calcium chloride
(C) Barium chloride
(D) All of above

10. Reaction of 'magnesium' with air is

(A) Exothermic reaction
(B) Endothermic reaction
(C) Reversible reaction
(D) Substitution reaction
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