Why are noble gases less reactive compared to other elements?

A. They have low ionization energy

C. They are found in trace amounts

Everyday Science · Atoms, Elements & Compounds · page 6 of 15

Some Important Elements MCQs with Answers

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Some Important Elements MCQs (51–60)

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Past paper MCQs in this chapter · See all past papers

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51.
Past Paper MCQ
Lead pencil is made up of?
Correct Answer: B. Graphite
One-liner
Lead pencil is made up of graphite, not lead.
52.
Past Paper MCQ
Diamond is an allotropic form of?
Correct Answer: C. Carbon
One-liner
Diamond is an allotropic form of Carbon.
53.
Who discovered noble gases for the first time?
Correct Answer: C. Sir William Ramsay
One-liner
Noble gases were first discovered by Sir William Ramsay, who isolated argon in 1894 and went on to discover neon, krypton, and xenon.
54.
Which noble gas is highly polarized?
Correct Answer: C. Xenon
One-liner
Xenon is the most highly polarized noble gas due to its large atomic size and high number of electrons.
55.
Which of the following uranium isotopes is used in nuclear reactions?
Correct Answer: B. 92 U-235
One-liner
The uranium isotope used in nuclear reactions is 92 U-235.
56.
Bio elements considered as vital for life are in numbers.
Correct Answer: C. 16
One-liner
Bio elements considered as vital for life are 16 in number.
57.
Ferrum is another name of _?
Correct Answer: B. Iron
One-liner
Ferrum is the Latin name for Iron, from which its chemical symbol Fe is derived.
58.
Past Paper MCQ
Why are noble gases less reactive compared to other elements?
Correct Answer: D. They have complete octet
One-liner
Noble gases are less reactive because they have a complete octet of electrons in their outermost shell.
59.
The atomic mass of sodium is _?
Correct Answer: A. 23 amu
One-liner
The atomic mass of sodium is 23 amu.
60.
What is the main component of sand?
Correct Answer: B. Silicon
One-liner
The main component of sand is silicon, which is present in the form of silica (silicon dioxide, SiO₂).

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Some Important Elements MCQs with Answers

Some Important Elements MCQs (51–60)

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