Everyday Science · Atoms, Elements & Compounds · page 3 of 15

Some Important Elements MCQs with Answers

Includes 16 past paper MCQs (marked).

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Some Important Elements MCQs (21–30)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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21.
Who discovered Hydrogen?
Correct Answer: C. Henry Cavendish
One-liner
Hydrogen was discovered by Henry Cavendish in 1766.
22.
Which one of the following is Barium?
Correct Answer: A. Ba
One-liner
The chemical symbol for Barium is Ba.
23.
How many naturally occurring isotopes does uranium have?
Correct Answer: C. Three
One-liner
Uranium has three naturally occurring isotopes: uranium-238, uranium-235, and uranium-234.
24.
Past Paper MCQ
The third most abundant element in the Earth's crust is ?
Correct Answer: C. Aluminum
One-liner
The third most abundant element in the Earth's crust is Aluminum (after Oxygen and Silicon).
25.
The study of Carbon is related to which branch?
Correct Answer: C. Inorganic Chemistry
One-liner
The study of carbon is related to Inorganic Chemistry.
26.
Maximum ionization potential is of _?
Correct Answer: C. Be
One-liner
Maximum ionization potential among the given options is of Be (Beryllium).
27.
Group VB of transition elements contains ?
Correct Answer: B. V, Nb, Ta
One-liner
Group VB of transition elements contains V, Nb, Ta (Vanadium, Niobium, and Tantalum).
28.
The atomic weight of Zn is _?
Correct Answer: D. 65.38
One-liner
The atomic weight of Zn (Zinc) is 65.38.
29.
Atomic number of oxygen is:
Correct Answer: C. 8
One-liner
The atomic number of oxygen is 8, meaning it has 8 protons in its nucleus.
30.
In graphite, the carbon atoms are arranged in which of the following structures?
Correct Answer: B. Hexagonal
One-liner
In graphite, carbon atoms are arranged in a hexagonal layered structure, where each carbon atom is bonded to three others in the same plane.

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Some Important Elements MCQs with Answers

Some Important Elements MCQs (21–30)

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