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 Chemistry Questions

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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:

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:

A Radioactive subatance emits

A) alpha particles B) beta particle
C) gamma particle D) all of the three
 
Answer & Explanation Answer: D) all of the three

Explanation:
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Q:

Number of moles of solute present in 1 litre of solution is

A) Normality B) Molarity
C) Molality D) Formality
 
Answer & Explanation Answer: B) Molarity

Explanation:

Moles of solute present in 1 litre or 1000ml of solution is called molarity

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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 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:

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 = 12mV2  or 

K.E ∝V2, 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:

Which half reaction correctly represents reduction?

A) Fe2+ + e- ---> Fe3+ B) Au3+ + 3e– ---> Au
C) Ag ---> Ag+ + e- D) All of the above
 
Answer & Explanation Answer: B) Au3+ + 3e– ---> Au

Explanation:

A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.

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