Which statement shows that diamond and graphite are allotropes of carbon?

B. Under suitable conditions, graphite can be converted into diamond

A. Both have the same crystalline structure

B. Under suitable conditions, graphite can be converted into diamond

C. Both are equally good conductors of electricity

D. Both have the same hardness and density

Neon gas was discovered by?

A. William Ramsay and Morris Travers

B. Joseph Priestley and Carl Scheele

C. Henry Cavendish and Humphry Davy

Everyday Science · Atoms, Elements & Compounds · page 5 of 15

Some Important Elements MCQs with Answers

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Some Important Elements MCQs (41–50)

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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41.
Which gas was identified in the Sun using spectroscopy?
Correct Answer: D. Helium
One-liner
Helium was first discovered in the Sun's spectrum before it was found on Earth, hence its name derived from the Greek word "Helios" meaning Sun.
42.
In d-block elements the irregularity in electronic configuration occurs in _?
Correct Answer: D. All of these
One-liner
In d-block elements, irregularity in electronic configuration occurs in all of these, including Cr, Cu, Pd, Mo, and several other transition metals.
43.
The forbidden energy gap of carbon in diamond structure is ?
Correct Answer: C. 5.5 eV
One-liner
The forbidden energy gap of carbon in diamond structure is 5.5 eV.
44.
What element has an atomic number of 22 and a mass of 47.90?
Correct Answer: C. Titanium
One-liner
The element with atomic number 22 and atomic mass 47.90 is Titanium.
45.
Oxygen was discovered in the year:
Correct Answer: B. 1774
One-liner
Oxygen was discovered in the year 1774 by Joseph Priestley.
46.
Which statement shows that diamond and graphite are allotropes of carbon?
Correct Answer: B. Under suitable conditions, graphite can be converted into diamond
One-liner
Graphite can be converted into diamond under suitable conditions, proving both are allotropes of carbon — different structural forms of the same element.
47.
Helium was first found in:
Correct Answer: C. Sun rays
One-liner
Helium was first discovered in sun rays (the solar spectrum) before it was found on Earth.
48.
What is the symbol of Potassium?
Correct Answer: B. K
One-liner
The chemical symbol of Potassium is K, derived from its Latin name "Kalium."
49.
Which of the following was discovered in August 1774?
Correct Answer: B. Oxygen
One-liner
Oxygen was discovered in August 1774 by Joseph Priestley.
50.
Past Paper MCQ
Neon gas was discovered by?
Correct Answer: A. William Ramsay and Morris Travers
One-liner
Neon gas was discovered by William Ramsay and Morris Travers in 1898.

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Some Important Elements MCQs with Answers

Some Important Elements MCQs (41–50)

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