Chemical Building Blocks of Life UPSC Questions

Biology

Chemical Building Blocks of Life MCQ Questions


13.

What is the equation for the formula of Magnesium + Oxygen → Magnesium Oxide

A.

Mg + O2 → MgO

B.

Mn + O2  → MgO

C.

Mg + O3 → MgO

D.

Mg + O2  →O

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ANSWER :

A. Mg + O2  → MgO

14.
A chemical equation is a _____________ chemical equation for a reaction.
A.
Bones
B.
Body
C.
Muscle
D.
Skeletal
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ANSWER :
D. Skeletal
15.
Equation is a skeletal chemical equation for the burning of
A.
Magnesium Oxide
B.
Magnesium Ribbon
C.
Magnesium in Air
D.
Air Vapour
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ANSWER :
C. Magnesium in Air
16.
The ___________________ can neither be created nor destroyed in a chemical reaction.
A.
Law of Chemical
B.
Law of Conservation Mass
C.
Law of Electrical
D.
Law of Neutron
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ANSWER :
B. Law of Conservation Mass
17.
The total mass of the elements present in the _____________ has to be equal to the total of elements present in the reactants.
A.
Material of a Chemical Reaction
B.
Manufacturing of Chemical Reaction
C.
Production of Chemical Reaction
D.
Products of a Chemical Reaction
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ANSWER :
D. Products of a Chemical Reaction
18.

Hydrogen gas can be produced by reacting zinc with sulfuric acid. This reaction also produces zinc sulfate. Which of the following symbol equations shows this chemical reaction?

A.

ZnSO₄ + H₂ ⟶ Zn + H₂SO₄

B.

H₂ + H₂SO₄ ⟶ Zn + ZnSO4

C.

Zn + Hâ‚‚SOâ‚„ ⟶ ZnSOâ‚„ + Hâ‚‚ 

D.

Zn + Hâ‚‚SOâ‚„ ⟶ Znâ‚„ + HOâ‚‚ 

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ANSWER :

C. Zn + H₂SO₄ ⟶ ZnSO₄ + H₂