Chemistry Questions

Q:

The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.

A) Crystallisation B) Crystallisation
C) Evaporation D) Evaporation
 
Answer & Explanation Answer: B) Crystallisation

Explanation:
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Q:

Which molecule is nonpolar and has a symmetrical shape?

A) NH3 B) HCl
C) H2O D) CH4
 
Answer & Explanation Answer: D) CH4

Explanation:

Among the given options, CH4 is a non polar molecule with symmetrical tetrahedral shape.

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Q:

Metals that are liquid at room temperature?

A) Caesium B) Gallium
C) Rubidium D) Mercury
 
Answer & Explanation Answer: D) Mercury

Explanation:

Mercury is the only metal that is in liqid form at room temperature. Caesium, Gallim and Rubidium are also metals that are in liquid form but at slightly high temperature than the room temperature.

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Q:

Which base is present in soap?

A) Sodium hydroxide B) Silicon dioxide
C) Calcium hydroxide D) Ammonium hydroxide
 
Answer & Explanation Answer: A) Sodium hydroxide

Explanation:
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Q:

Which among the following is false about alpha particles?

A) They have high ionizing power B) They have high penetrating power
C) They have high kinetic energy D) They are positively charged helium nuclei
 
Answer & Explanation Answer: B) They have high penetrating power

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Q:

Which among the following will be a negative ion?

A) If it has more electrons than protons B) If it has more electrons than neutrons
C) If it has more protons than electrons D) If it has more protons than neutrons
 
Answer & Explanation Answer: A) If it has more electrons than protons

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Q:

What two elements are used to make bronze?

A) Lead and copper B) copper and tin
C) Tin and lead D) copper and iron
 
Answer & Explanation Answer: C) Tin and lead

Explanation:

The two elements that are used to make bronze are tin and lead.

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Q:

What types of atoms form covalent bonds?

A) metal and metal B) metal and non metal
C) non metal and non metal D) All of the above
 
Answer & Explanation Answer: C) non metal and non metal

Explanation:

Covalent bonds are bonds formed between two non metals by sharing of electrons in their outer most orbits for stable.

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