Chemistry Questions

Q:

Energy transfer by convection is primarily restricted to

A) fluids B) solids
C) liquids D) gases
 
Answer & Explanation Answer: A) fluids

Explanation:

Convection is the mode of heat transfer which involves bulk motion of a fluid to transfer heat. Energy transfer by convection is primarily restricted to fluids. Fluids can be both liquids and gases.

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Q:

What occurs when an atom loses an electron?

A) The atom's radius decreases and the atom becomes a positive ion. B) The atom's radius increases and the atom becomes a negative ion.
C) The atom's radius decreases and the atom becomes a negative ion. D) The atom's radius increases and the atom becomes a positive ion.
 
Answer & Explanation Answer: A) The atom's radius decreases and the atom becomes a positive ion.

Explanation:

When an atom loses an electron it becomes a positive ion by acquiring negatively charged. When it loses electron, the atom's radius also decreased.

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Q:

The process of depositing a layer of zinc on iron is called ___________

A) Galvanisation B) Crystallisation
C) Rusting D) Baking
 
Answer & Explanation Answer: A) Galvanisation

Explanation:
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Q:

In the thermite process, the reducing agent is

A) Chlorine B) Aluminium
C) Silicon D) Iron
 
Answer & Explanation Answer: B) Aluminium

Explanation:

In the thermite process, the reducing agent is Aluminium.

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Q:

Carbon disulfide is prepared by heating sulfur and charcoal.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Yes, Carbon disulfide is prepared by heating sulfur and charcoal. 


S2 + C ----> CS2

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Q:

Water which is suitable for drinking is called _______________ water.

 

A) hygienic B) sparkling
C) potable D) sanitary
 
Answer & Explanation Answer: C) potable

Explanation:
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Q:

Which of the following is also known as Carbolic Acid?

A) Hydroxide B) Sulphuric Acid
C) Ethanol D) Phenol
 
Answer & Explanation Answer: D) Phenol

Explanation:

Phenol with a molecular formula [C6H5OH] is also called as Carbolic Acid. It is a white poisonous clear compound with sweet smell. It is used in making plastics, detergents and drugs.

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Q:

Which one of the following elements does not form solid hydrogen carbonate?

A) Sodium B) Potassium
C) Caesium D) Lithium
 
Answer & Explanation Answer: D) Lithium

Explanation:

Potassium bicarbonate (also known as potassium hydrogen carbonate or potassium acid carbonate) is the inorganic compound with the chemical formula KHCO3. It is a white solid

Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder.

LiHCO3 is found in solution form while rest alkali metals hydrogen carbonates are solid due to the anomalous properties of Li and its diagonal relationship with the Mg.

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