1099+ Important Chemistry MCQ Questions Answers

Q:

Which one of the following substances does not have a melting point

A) bromine	B) sodium chloride
C) mercury	D) glass

Answer & Explanation Answer: D) glass

Explanation:

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Q:

The discovery of neutron became very late because

A) it is present in nucleus	B) it is a fundamental particle
C) it does not move	D) it does not carry any charge

Answer & Explanation Answer: D) it does not carry any charge

Explanation:

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Q:

Sodium carbonate crystal lose water molecules this property is called

A) hygroscopy	B) deliquescence
C) efflorescence	D) None of these

Answer & Explanation Answer: C) efflorescence

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:

The absolute value of charge on electron was determined by

A) J.J.Thomson	B) R.A. Millikan
C) Rutherford	D) Chadwick

Answer & Explanation Answer: B) R.A. Millikan

Explanation:

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Q:

Which one of the following elements is essential for construction is nuclear reactors

A) Cobalt	B) Nickel
C) Zirconium	D) Tungsten

Answer & Explanation Answer: C) Zirconium

Explanation:

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Q:

In known elements, the maximum number is of

A) Metals	B) Non Metals
C) Metalloids	D) None of these

Answer & Explanation Answer: A) Metals

Explanation:

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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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