Chemistry Questions

Q:

The absolute zero is a temperature at which _______

A) molecular motion in a gas would cease B) water freezes
C) all gases become liquid D) all gases become solid
 
Answer & Explanation Answer: A) molecular motion in a gas would cease

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Q:

The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 3rd group and the 4th period?

A) 23 B) 21
C) 19 D) 11
 
Answer & Explanation Answer: B) 21

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Q:

Which of the following is used as anaesthetics?

A) N2 B) N2O
C) CH4 D) CO2
 
Answer & Explanation Answer: B) N2O

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Q:

Earth's crust mainly contains ______.

A) bauxite B) manganese
C) silica D) iron
 
Answer & Explanation Answer: C) silica

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Q:

30 litres of salt solution contains 5% salt. How many litres of water must be added so as to get a resultant solution containing 3%salt?

A) 20 litres B) 25 litres
C) 30 litres D) 35 litres
 
Answer & Explanation Answer: A) 20 litres

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Q:

Removal of carbon particles from air involves the principle of

A) Precipitation B) Filteration
C) Electrophoresis D) Sedimentation
 
Answer & Explanation Answer: C) Electrophoresis

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Q:

What is the chemical formula for Sodium Chloride (Salt)?

A) NaCl2 B) NaCl
C) Na2Cl D) Na2C
 
Answer & Explanation Answer: B) NaCl

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Q:

What is the process of melting also called?

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

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