1099+ Important Chemistry MCQ Questions Answers

Q:

In isotopes the number of neutrons are

A) same	B) different
C) both	D) none

Answer & Explanation Answer: B) different

Explanation:

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Q:

Milk is a

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

Answer & Explanation Answer: A) mixture

Explanation:

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Q:

Antimony is

A) metal	B) non metal
C) non metaloid	D) metalloid

Answer & Explanation Answer: D) metalloid

Explanation:

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Q:

The element gold occurs in which period?

A) 11	B) 5
C) 6	D) 7

Answer & Explanation Answer: C) 6

Explanation:

The chemical element gold has an atomic number 79 is present in period 6 and group 11 of the periodic table.

The_element_gold1551271023.png image

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Q:

Which statement describes the acid found in vinegar acetic acid ?

A) It feels slippery	B) It reacts with Mg to produce H2
C) It tastes bitter	D) It releases OH- in a solution

Answer & Explanation Answer: B) It reacts with Mg to produce H2

Explanation:

Acid which is present in vinegar is approximately 5 % of acetic acid. This can be confirmed by testing the vinegar with magnesium which gives out hydrogen as a gas.

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Q:

All atoms of uranium have the same

A) Atomic mass	B) Number of electrons
C) Atomic number	D) Mass number

Answer & Explanation Answer: C) Atomic number

Explanation:

There are many isotopes of uranium and all of them have same atomic number i.e, sum of nmber of neutrons and protons.

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Q:

The Kinetic energy of gas molecules

A) is unaffected by temperature variations	B) decreases with increase of temperature
C) increases with decrease of temperature	D) increases with increase of temperature

Answer & Explanation Answer: D) increases with increase of temperature

Explanation:

Kinetic Energy $K . E = \frac{1}{2} m V^{2}$ or

$K . E \propto V^{2}$ , Where 'm' is the mass and 'v' is the velocity of molecules.

Velocity is proportional to temperature. Hence, KE is proportional to temperature and would increase with temperature.

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Q:

A mixture of sand and naphthalene can be seperated by __________

A) Fractional distillation	B) Sublimation
C) Chromatography	D) Any of them

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