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Q:

In Mendeleev's periodic table, the properties of the elements are considered a periodic function of their:

A) Atomic mass B) Ionization enthalpy
C) Atomic size D) Atomic number
 
Answer & Explanation Answer: A) Atomic mass

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Q:

The polar ice-caps are made of ____________ water

A) Saline B) Salt
C) Sour D) Fresh
 
Answer & Explanation Answer: D) Fresh

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Q:

Which of the following molecules is joined by a double covalent bond?

A) Cl2 B) O2
C) N2 D) He2
 
Answer & Explanation Answer: B) O2

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Q:

Which of the following elements has the lowest melting point?

A) Oxygen B) Platinum
C) Sodium D) Tin
 
Answer & Explanation Answer: A) Oxygen

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Q:

The process of depositing a layer of any desired metal on another material by means of electricity is called ___________.

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

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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:

Which process forms exfoliation domes?

A) biological activity B) frost wedging
C) unloading D) reactions with oxygen
 
Answer & Explanation Answer: D) reactions with oxygen

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Q:

Which process is a chemical change?

A) Burning gasoline B) Boiling water
C) Evaporating water D) Melting ice
 
Answer & Explanation Answer: A) Burning gasoline

Explanation:

Burning gasoline is the only process that involving in a chemical change in the given options. A chemical change is a change in the starting substances that are called reactants from the formed new substances that are called products. 

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