Cement is mixed with water, it sets into a hard mass due to: MCQ with Answer and Explanation

Cement is mixed with water, it sets into a hard mass due to:
A. Reduction
B. Hydration
C. Evaporation
D. Oxidation
Answer: Option B
Solution (By JKSSB Mock Tests)
Cement compounds react with water (hydration) forming hydrated silicates and aluminates, which crystallize and interlock, giving strength. This is exothermic.

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Question #1
Which catalyst is used in the hydrogenation of vegetable oils?
A. V₂O₅
B. Ni
C. Fe
D. Pt

Correct Answer: Option B


Explanation:
Nickel (finely divided) is used as a catalyst in the hydrogenation of unsaturated vegetable oils to saturated fats (vanaspati ghee). The reaction adds H₂ across double bonds. Platinum and palladium are also hydrogenation catalysts but nickel is cheaper and industrially preferred. Fe is used in Haber process for ammonia synthesis, V₂O₅ in contact process for H₂SO₄. Catalysts provide an alternative pathway with lower activation energy.

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Question #2
Hydrogen peroxide decomposes to water and oxygen. This reaction is:
A. 2H₂O₂ → 2H₂ + 2O₂
B. 2H₂O₂ → 2H₂O + O₂
C. H₂O₂ + H₂ → 2H₂O
D. H₂O₂ + O → H₂O + O₂

Correct Answer: Option B


Explanation:
Decomposition of H₂O₂ yields water and O₂. It is catalyzed by MnO₂, light, or enzyme catalase. It's a disproportionation reaction.

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Question #3
Which allotrope of carbon is used as a neutron moderator in nuclear reactors?
A. Graphite
B. Diamond
C. Fullerene
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Correct Answer: Option A


Explanation:
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