Chemistry Questions

Q:

Which element is generally No Radioactive?

A) Thorium B) Polonium
C) Germanium D) Plutonium
 
Answer & Explanation Answer: C) Germanium

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Q:

............ element is represented by the given symbol.

A) Hydrogen B) Mercury
C) Carbon D) Gold
 
Answer & Explanation Answer: B) Mercury

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Q:

Process of loosing electrons is known as _____.

A) oxidation B) reduction
C) radiation D) both oxidation and reduction
 
Answer & Explanation Answer: A) oxidation

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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:

Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in

A) Conduction B) Convection
C) Radiation D) Both conduction and convection
 
Answer & Explanation Answer: B) Convection

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Q:

By which of the following processes are metals of high reactivity extracted from purified molten ore?

A) Reduction by an appropriate reducing agent B) Roasting
C) Electrolysis D) Calcination
 
Answer & Explanation Answer: C) Electrolysis

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Q:

Which of the following is the best fire-extinguisher?

A) Water B) Oxygen
C) Carbon-dioxide D) Soil
 
Answer & Explanation Answer: C) Carbon-dioxide

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Q:

A) Mineral B) Tribe
C) Grass D) Town
 
Answer & Explanation Answer: C) Grass

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