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 Chemistry Questions

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Q:

Calculate the relative molecular mass of water H2O?

A) 18u B) 1.8u
C) 2.0u D) 20u
 
Answer & Explanation Answer: A) 18u

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Q:

A change in which one or more new substances are formed is called _________.

A) Physical Change B) Chemical Change
C) Rusting D) Galvanisation
 
Answer & Explanation Answer: B) Chemical Change

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Q:

What is the chemical formula of aluminium nitride?

A) AlN B) Al2N
C) AlN2 D) AlN3
 
Answer & Explanation Answer: A) AlN

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Q:

Which is a compound that contains carbon?

A) Ethane B) Propane
C) Methane D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

The compound methane is a simple hydrocarbon contains one carbon bonded to four hydrogens. Ethane is a simple hydrocarbon which contains two carbon atoms and four hydrogen atoms. Similarly, propane with three carbons.

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Q:

Which among the following is an endothermic reaction?

A) Respiration B) Combustion
C) Sweating D) Burning of natural gas
 
Answer & Explanation Answer: C) Sweating

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Q:

______ decreases the rate of setting of cement.

A) Alumina B) Silica
C) Gypsum D) Magnesium oxide
 
Answer & Explanation Answer: C) Gypsum

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Q:

What is the product formed when sodium bicarbonate is heated strongly?

A) Sodium Carbonate B) Sodium Hydroxide
C) Sodium Peroxide D) Sodium Monoxide
 
Answer & Explanation Answer: A) Sodium Carbonate

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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 1st group and the 4th period?

A) 21 B) 17
C) 19 D) 9
 
Answer & Explanation Answer: C) 19

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