1099+ Important Chemistry MCQ Questions Answers

Q:

A bond formed by the transfer of electrons between atoms of the elements is called

A) Ionic bond	B) Covalent bond
C) Co-ordinate bond	D) Hydrogen bond

Answer & Explanation Answer: A) Ionic bond

Explanation:

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Q:

The compound MgCl2 is named

A) Magnesium Chloride	B) Magnesium Chlorine
C) Magnesium Dichloride	D) Dimagnesium Chloride

Answer & Explanation Answer: A) Magnesium Chloride

Explanation:

The compound MgCl2 is named as Magnesium Chloride.

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Q:

Number of moles of CO2 present in 24 grams of carbon is

A) 0.5	B) 1
C) 2	D) 0.25

Answer & Explanation Answer: C) 2

Explanation:

1 mole of CO2 contain 12gms of carbon and 44 gms of CO2

therefore 24 gms of carbon is present in 88 gms of CO2 or 2 moles of CO2

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Q:

Nucleus of Hydrogen atom consists of

A) 2 protons only	B) 2 neutrons only
C) 1 proton only	D) 1 electron only

Answer & Explanation Answer: C) 1 proton only

Explanation:

The nucleus of hydrogen consists of only a single proton.

Its parts are a single negatively-charged electron that circles a single positively-charged nucleus of the hydrogen atom.

The electron is bound to the nucleus by the Coulomb force.

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Q:

The main use of salt in the diet is to

the_main_use_of_salt_in_the_diet_is_to1552126680.jpg image

A) produce in small amounts the hydrochloric acid required for the digestion of food	B) increase the solubility of food particles in water
C) make the taste of food better	D) ease the process of cooking

Answer & Explanation Answer: A) produce in small amounts the hydrochloric acid required for the digestion of food

Explanation:

The main use of salt in the diet is to produce in small amounts the hydrochloric acid required for the digestion of food.

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Q:

Which of the following definitions describes a chemical hazard?

A) Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness	B) These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks
C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job	D) The most commonly thought of hazards for construction

Answer & Explanation Answer: C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job

Explanation:

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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:

An element X forms an oxide $XO_{_{3}}$ , what ihe valency of X

A) 1	B) 2
C) 3	D) 6

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