1099+ Important Chemistry MCQ Questions Answers

Q:

What is the systematic name of Mg(NO3)2?

A) Manganese nitrite	B) Magnesium nitrite
C) Magnesium nitrate	D) Manganese nitrate

Answer & Explanation Answer: C) Magnesium nitrate

Explanation:

Mg(NO3)2 is Magnesium nitrate.

In the case of Mg(NO3)2, the metal in the compound is magnesium (Mg), and the non-metal here is called the nitrate ion (NO3). This makes the name of the compound simply magnesium nitrate.

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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:

One method by which the components of air can be seperated is

A) shaking with caustic soda solution	B) shaking with water
C) fractional distillation of liquid air	D) passing air over heated magnesium

Answer & Explanation Answer: C) fractional distillation of liquid air

Explanation:

The two main components of air are nitrogen and oxygen. They are seperated by the fractional distillation of liquid air. Liquefied air contains liquid nitrogen and liquid oxygen. Liquid nitrogen with the lower boiling point more readily evaporates than the less volatile liquid oxygen.

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Q:

Triple point of water corresponds to

A) 1 atm, 0°C	B) 1 atm, 0.01°C
C) 1 atm, 0 K	D) 4.58 Torr, 0.01°C

Answer & Explanation Answer: D) 4.58 Torr, 0.01°C

Explanation:

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Q:

The atoms of the elements having same mass number but different atomic number are called

A) Isotopes	B) Isobars
C) Isotones	D) Isomers

Answer & Explanation Answer: B) Isobars

Explanation:

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Q:

Which acid is present in tomato?

A) Sulphuric acid	B) HCl
C) Both A & B	D) Citric acid

Answer & Explanation Answer: D) Citric acid

Explanation:

which_acid_is_present_in_tomato1542371895.jpg image

Citric acid is present in tomatoes.

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Q:

Chloroform used as anaesthetic should be preserved in the dark in tightly stoppered bottles because otherwise

A) it becomes coloured	B) it gets evaporated in air
C) it gets oxidised to phosgene	D) it gets decomposed to chloropicrin

Answer & Explanation Answer: C) it gets oxidised to phosgene

Explanation:

Chloroform, $C H C l_{3}$ is easily oxidised to the highly poisonous gas known as phosgene or carbonyl chloride COCl2. Hence if it is used as anaesthetic it should be kept free from sunlight and air.

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Q:

Isotopes have ______.

I. similar physical quantities and different chemical properties

II. different physical properties

III. similar chemical properties

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

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