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 Chemistry Questions

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Q:

Which gas is used for the preparation of Soda water?

A) Carbon Dioxide B) Oxygen
C) Hydrogen D) Ammonia
 
Answer & Explanation Answer: A) Carbon Dioxide

Explanation:
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Q:

Which statement about subatomic particles is not true?

A) Protons and neutrons have the same charge B) Protons and electrons have the opposite charhes
C) Protons and neutrons have almost the same mass D) All of the above
 
Answer & Explanation Answer: A) Protons and neutrons have the same charge

Explanation:
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Q:

Removal of oil and grease from sewage [waste water]

A) Skimming B) Filtration
C) Screening D) None of the above
 
Answer & Explanation Answer: A) Skimming

Explanation:

Skimming is the removal of any material or particles that are floating on the surface. Hence, Removal of oil and grease from sewage - waste water is called as skimming.

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Q:

Which chemical bond most likely stores the most energy?

A) Single bond B) Double bond
C) Both A & B D) None of the above
 
Answer & Explanation Answer: B) Double bond

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Q:

Strength of concrete increases with

A) increase in fineness of cement B) decrease in size of aggregate
C) increase in water cement ratio D) decrease in curing time
 
Answer & Explanation Answer: C) increase in water cement ratio

Explanation:

Strength of concrete increases with increase in water cement ratio as the strength of the cement is directly proportional to water cement ratio.

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Q:

Monopotassium tartarate was used in

A) Fertiliser B) Explosives
C) Photography D) Baking
 
Answer & Explanation Answer: D) Baking

Explanation:

Monopotassium tartarate was used in baking powder.

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Q:

What are the end products of cellular respiration?

A) ATP, Glucose B) Glucose, Oxygen
C) Oxygen, Water D) ATP, Water
 
Answer & Explanation Answer: D) ATP, Water

Explanation:

Cellular respiration is the three-step process by which cells make ATP using glucose and oxygen.

Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP, waste products include carbon dioxide and water.

 

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Q:

Which of the following is an example of chemical weathering?

A) Oxidation B) Acid rains
C) Carbonation D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Chemical weathering is what happens when rocks are broken down and chemically altered.

Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.

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