1099+ Important Chemistry MCQ Questions Answers

Q:

Which of the following does not contain the material particles

A) alpha - rays	B) beta - rays
C) gamma - rays	D) anode rays

Answer & Explanation Answer: C) gamma - rays

Explanation:

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Q:

Of the following elements, which one has the same oxidation state in all of its compounds?

A) Hydrogen	B) Fluroine
C) Carbon	D) oxygen

Answer & Explanation Answer: B) Fluroine

Explanation:

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Q:

Formation of cation occurs by

A) gain of electron	B) loss of electron
C) gain of proton	D) loss of proton

Answer & Explanation Answer: B) loss of electron

Explanation:

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Q:

A particle which is similar to electron is

A) positron	B) beta particle
C) photon	D) mason

Answer & Explanation Answer: B) beta particle

Explanation:

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Q:

When combining with nonmetallic atoms, metallic atoms generally will

A) Lose electrons and forms cations	B) Gain electrons and forms anions
C) Lose electrons and forms anions	D) Gain electrons and forms cations

Answer & Explanation Answer: A) Lose electrons and forms cations

Explanation:

When combining with nonmetallic atoms, metallic atoms generally will Lose electrons and forms cations.

As the ionization energy of te metals are very low, so they can easily lose electrons and form positively charged ion called cations.

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3 6664

Q:

Which of the following statements about monosaccharide structure is true?

A) Aldoses and ketoses differ in the position of their hydroxyl groups.	B) Monosaccharides can be classified according to the spatial arrangement of their atoms.
C) All monosaccharides contain carbon, hydrogen, oxygen, and nitrogen atoms.	D) A six-carbon sugar is called a pentose.

Answer & Explanation Answer: B) Monosaccharides can be classified according to the spatial arrangement of their atoms.

Explanation:

Monosaccharides, also called simple sugars, are the most basic units of carbohydrates. They are fundamental units of carbohydrates and cannot be further hydrolyzed to simpler compounds.

Hence, Monosaccharides can be classified according to the spatial arrangement of their atoms is true about Monosaccharides.

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3 6651

Q:

The magnetic moment (spin only) of $[N i C l_{4}]^{2 -}$ is

A) 1.41 BM	B) 1.82 BM
C) 5.46 BM	D) 2.82 BM

Answer & Explanation Answer: D) 2.82 BM

Explanation:

Hybridisation of Ni is $e^{-}$

Unpaired $3 d^{8}$ in is 2

So $Ω = \sqrt{n (n + 2)} B M = \sqrt{2 x 4} = \sqrt{8} = 2.82 B M$

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Q:

By volume, 21% of air is _______________.

A) hydrogen	B) oxygen
C) nitrogen	D) carbon dioxide

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