1099+ Important Chemistry MCQ Questions Answers

Q:

Which one of the following statements would be INCORRECT to use?

A) An atom of a compound	B) A mole of an element
C) A mole of a compound	D) An atom of an element

Answer & Explanation Answer: A) An atom of a compound

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

Answer & Explanation Answer: D) C,O,N,H

Explanation:

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Q:

Which is released during the formation of a peptide bond?

A) an amino group	B) a five-carbon sugar
C) both 1 and 2	D) a water molecule

Answer & Explanation Answer: D) a water molecule

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:

Which of the following statements is INCORRECT?

I) Bleaching powder is a pale yellow powder

II) Dry NH3 gas turns red litmus blue

III) The pH of rain water is nearly 7

IV) The pH of acid rain is nearly 5.6

A) I, II and IV	B) II and III
C) I and IV	D) Only II

Answer & Explanation Answer: D) Only II

Explanation:

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Q:

Fill in the blank with the most appropriate option.

An element attains stability when it achieves ________ state.

A) an only-duplet	B) an only-octet
C) a duplet or octet	D) a heptate

Answer & Explanation Answer: C) a duplet or octet

Explanation:

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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:

The reduction potential of hydrogen half-cell will be negative if :
(1) $P (H_{2})$ = 2 atm and [H+] = 2.0 M
(2) $P (H_{2})$ = 1 atm and [H+] = 2.0 M
(3) $P (H_{2})$ = 1 atm and [H+] = 1.0 M
(4) $P (H_{2})$ = 2 atm and [H+] = 1.0 M

A) Option 1	B) Option 2
C) Option 3	D) Option 4

Answer & Explanation Answer: D) Option 4

Explanation:

$H^{+} - e^{-} \to \frac{1}{2} H_{2}$

Apply Nernst equation

$E = 0 - \frac{0.059}{1} \log (\frac{P H_{2}^{\frac{1}{2}}}{[H^{+}]})$

$E = - \frac{0.059}{1} \log (\frac{2^{\frac{1}{2}}}{1})$

Therefore E is Negative

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