1099+ Important Chemistry MCQ Questions Answers

Q:

The element that has the highest first ionization potential is.......

A) Oxygen	B) Carbon
C) Boron	D) Nitrogen

Answer & Explanation Answer: D) Nitrogen

Explanation:

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9 4942

Q:

A by product of involuntary muscle contraction and relaxation is

A) Oxygen	B) Water
C) Heat	D) Nitrogen

Answer & Explanation Answer: C) Heat

Explanation:

A_by_product_of_involuntary_muscle_contraction_and_relaxation_is1537166589.jpg image

When a muscle is contracted and relaxed some amount of heat is released as a by product.

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2 4874

Q:

Who present the theory of radioactive disintegration

A) Rutherford and Soddy	B) Soddy and Fajan
C) Thomson and Rutherford	D) Hahn and strassman

Answer & Explanation Answer: A) Rutherford and Soddy

Explanation:

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7 4867

Q:

The substances that are composed of to or more different elements in fixed proportion by mass are called

A) mixture	B) compound
C) element	D) None of these

Answer & Explanation Answer: B) compound

Explanation:

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5 4860

Q:

Oxidation Number of 'S' in $H_{2} S O_{4}$ ?

A) +6	B) +2
C) -6	D) -2

Answer & Explanation Answer: A) +6

Explanation:

In $H_{2} S O_{4}$ ,

Hydrogen has a charge of +2, with each hydrogen has +1.

Oxygen has a charge of -8, with each oxugen has -2.

Total charge = (2 - 8) = -6

Therefore, the Oxidation number of Sulphur S is '+6' because to make the compound stable.

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11 4845

Q:

'Minamata' disease was caused by ?

A) Lead	B) Mercury
C) Cadmium	D) Zinc

Answer & Explanation Answer: B) Mercury

Explanation:

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11 4832

Q:

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :

A) An acetylenic triple bond	B) Two ethylenic double bonds
C) A vinyl group	D) An isopropyl group

Answer & Explanation Answer: C) A vinyl group

Explanation:

$C =} C H_{2} \overset{O z o n o l y s i s}{\to} H C H O$

Vinylic group.

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3 4828

Q:

Standard Electrode potential is measured in terms of

A) Pyrometer	B) Electrometer
C) Thermometer	D) Voltmeter

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