Catalytic converters in automobiles use which metals to reduce pollution? MCQ with Answer and Explanation

Catalytic converters in automobiles use which metals to reduce pollution?
A. Iron, Copper, Nickel
B. Platinum, Palladium, Rhodium
C. Zinc, Lead, Tin
D. Gold, Silver, Copper
Answer: Option B
Solution (By JKSSB Mock Tests)
Catalytic converters use precious metals like platinum, palladium, and rhodium as catalysts to convert toxic exhaust gases (CO, NOx, unburnt hydrocarbons) into less harmful substances (CO₂, N₂, H₂O) before they are released into the atmosphere. These metals are chosen for their high catalytic activity and durability.

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Practice More chemistry Questions

Question #1
The father of modern chemistry is:
A. Antoine Lavoisier
B. Dmitri Mendeleev
C. J.J. Thomson
D. John Dalton

Correct Answer: Option A


Explanation:
Lavoisier is known for the law of conservation of mass, naming oxygen/hydrogen, and establishing chemistry as a quantitative science. Dalton proposed atomic theory; Mendeleev periodic table.

This question belongs to: Science chemistry
Question #2
The number of atoms in a molecule of phosphorus (P₄) is:
A. 2
B. 4
C. 8
D. 1

Correct Answer: Option B


Explanation:
White phosphorus exists as P₄ tetrahedral molecules, containing 4 phosphorus atoms. So atomicity is 4. Sulfur is S₈, oxygen is O₂, ozone O₃. Atomicity is the number of atoms in a molecule of an element. Phosphorus is a non-metal. Red phosphorus is polymeric but P₄ is the common molecular form.

This question belongs to: Science chemistry
Question #3
Which of the following sets of quantum numbers is impossible?
A. n=2, l=1, m=-1, s=-1/2
B. n=1, l=0, m=0, s=+1/2
C. n=3, l=2, m=-3, s=+1/2
D. n=4, l=3, m=0, s=-1/2

Correct Answer: Option C


Explanation:
The magnetic quantum number (m) can only take integer values ranging from -l to +l. For n=3, l can be 2 (a d-orbital). If l=2, the possible values for m are -2, -1, 0, +1, +2. The value m=-3 is outside this range, making this set of quantum numbers impossible.

This question belongs to: Science chemistry