1099+ Important Chemistry MCQ Questions Answers

Q:

Brass gets discoloured in air because of the presence of which of the following gases in air ?

A) Hydrogen sulphide	B) Oxygen
C) Nitrogen	D) Carbon dioxide

Answer & Explanation Answer: A) Hydrogen sulphide

Explanation:

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Q:

Electron configuration of cobalt 2+?

Answer

The s,p,d,f configuration for cobalt (Co) is 1s22s22p63s23p64s23d7, determined by the position of the element on the periodic table. The electron configuration for Cobalt at ground state would simply be Co: [Ar] 4s²3d⁷.

The electron configuration of Cobalt will end in d block as Cobalt is an inner transition metal. Cobalt is in the 7th column of the d block and therefore has 7 d electrons d7.

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Q:

What is the structure of IF7 ?

A) Triagonal bipyramid	B) Pentagonal bipyramid
C) Square pyramid	D) tetrahedral

Answer & Explanation Answer: B) Pentagonal bipyramid

Explanation:

In IF7 out of 7 Flourine atoms 5 of them are placed on a plane in Pentagon shape .In remaining 2 flourines one is placed above the plane and other below the plane each at 90 degrees

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Q:

Silver Mirror test is given by which one of the following compounds?

1. Benzophenone

2. Acetaldehyde

3. Acetone

4. Formaldehyde

A) Only 1	B) Only 2
C) 1 and 3	D) 2 and 4

Answer & Explanation Answer: D) 2 and 4

Explanation:

Both Formaldehyde and Acetaldehyde will give this test

$H C H O \overset{[A g (N H_{3})_{2}^{+}]}{\to} \overset{A g}{S i l v e r m i r r o r} + O r g a n i c c o m p o u n d$

$C H_{3} - C H O \overset{[A g (N H_{3})_{2}^{+}]}{\to} \underset{S i l v e r m i r r o r}{A g} + O r g a n i c c o m p o u n d$

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Q:

A ‘breath test’ used by traffic police to check drunken driving uses ____?

A) Turmeric on filter paper	B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid	D) Potassium dichromatic-sulphuric acid

Answer & Explanation Answer: D) Potassium dichromatic-sulphuric acid

Explanation:

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Q:

Name the Scientist who stated that matter can be converted into energy

A) Boyle	B) Lavoisier
C) Avogadro	D) Einstein

Answer & Explanation Answer: D) Einstein

Explanation:

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Q:

When formaldehyde and potassium hydroxide are heated , we get

A) Acetylene	B) Methyl alcohol
C) Methane	D) Ethyl formate

Answer & Explanation Answer: B) Methyl alcohol

Explanation:

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Q:

The enzyme that converts glucose to ethyl alcohol is

A) Maltase	B) Zymase
C) Diastase	D) Invertase

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