1099+ Important Chemistry MCQ Questions Answers

Q:

Which of the Following is an Amorphous solid?

A) Quartz Glass(Sio2)	B) Chrome Alum
C) Silicon Carbide(SiC)	D) Graphite

Answer & Explanation Answer: A) Quartz Glass(Sio2)

Explanation:

An amorphous or non-crystalline solid is a solid that lacks the long-range order that is characteristic of a crystal. In Brief, An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.

Quartz glass (SiO2) is an amorphous solid due to its short range order of constituent particles. Note Quartz is a crystalline solid while quartz glass is an amorphous solid.

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Q:

When water freezes its density

A) decreases	B) remains constant
C) increases	D) become zero

Answer & Explanation Answer: A) decreases

Explanation:

When water freezes its density decreases.

Water at ordinary temperatures contracts and increases in density as it is cooled, like most substances. But at about 4°C it reaches a maximum density and then decreases in density as it approaches the freezing point.

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Q:

' Misch metal ' is widely used in manufacture of which of the following

A) Material of car brake	B) Smoke detectors
C) Cigarette lighters	D) Emergency lights

Answer & Explanation Answer: C) Cigarette lighters

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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Q:

The metal which reacts most violently with with cold water is

A) calcium	B) sodium
C) magnesium	D) potassium

Answer & Explanation Answer: D) potassium

Explanation:

Potassium reacts violently with water liberating hydrogen. The reaction is so violent that the liberated hydrogen catches fire.

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Q:

How many electrons are there in Na+

A) 1	B) 10
C) 11	D) 12

Answer & Explanation Answer: B) 10

Explanation:

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Q:

Which one of the following elements is the poorest conductor of heat

A) sodium	B) lead
C) zinc	D) mercury

Answer & Explanation Answer: B) lead

Explanation:

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Q:

What is the element present in urea

A) C,H,O	B) C,N,O
C) C,N,H	D) C,O,N,H

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