Chemical Building Blocks of Life UPSC Questions

Biology

Chemical Building Blocks of Life MCQ Questions


7.
Which is an example of a redox reaction?
A.
NaOH + HCl → NaCl + H₂O
B.
CuO + H₂ → Cu + H₂O
C.
CaO + H₂O → Ca(OH)₂
D.
BaCl₂ + Na₂SO₄ → BaSO₄ + NaCl
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ANSWER :
B. CuO + H₂ → Cu + H₂O
8.
What is corrosion?
A.
Rusting of iron
B.
Tarnishing of silver
C.
Formation of green coating on copper
D.
All of the above
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ANSWER :
D. All of the above
9.
What causes rancidity in food items?
A.
Moisture
B.
Air oxidation
C.
Bacteria
D.
Sugar
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ANSWER :
B. Air oxidation
10.
Which of these is a double displacement reaction?
A.
Zn + CuSO₄ → ZnSO₄ + Cu
B.
BaCl₂ + Na₂SO₄ → BaSO₄ + NaCl
C.
H₂ + Cl₂ → HCl
D.
Fe + H₂O → Fe₃O₄ + H₂
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ANSWER :
B. BaCl₂ + Na₂SO₄ → BaSO₄ + NaCl
11.
Which reaction shows thermal decomposition?
A.
CaCO₃ → CaO + CO₂
B.
2KBr + Cl₂ → 2KCl + Br₂
C.
H₂ + O₂ → H₂O
D.
C + O₂ → CO₂
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ANSWER :
A. CaCO₃ → CaO + CO₂
12.
What is formed when magnesium burns in air?
A.
Magnesium nitrate
B.
Magnesium hydroxide
C.
Magnesium oxide
D.
Magnesium carbonate
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ANSWER :
C. Magnesium oxide