Questions

Q:

____ is the most electropositive and ___ is the most electronegative element of the third period of modern periodic table.

 

A) Sodium, Potassium B) Magnesium, Aluminium
C) Sodium, Chlorine D) Aluminium, Chlorine
 
Answer & Explanation Answer: C) Sodium, Chlorine

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Q:

What is dry ice?

A) Solid Carbon dioxide B) Solid Nitrogen dioxide
C) Solid Sulphur dioxide D) Solid Water
 
Answer & Explanation Answer: A) Solid Carbon dioxide

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Q:

What are isobars?

A) Elements with same atomic number but different mass number B) Elements with different atomic number but same mass number
C) Elements with different atomic number and different mass number D) Elements with same atomic number and same mass number
 
Answer & Explanation Answer: B) Elements with different atomic number but same mass number

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Q:

The Chemical formula of Acetic acid is _____.

A) CH3COH B) CH3COOH
C) CH3COCH3 D) CH2COOH
 
Answer & Explanation Answer: D) CH2COOH

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Q:

For the aquatic organisms, the source of food is

A) Phytoplankton B) Sea Weed
C) Aqua plankton D) Zooplankton
 
Answer & Explanation Answer: A) Phytoplankton

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Q:

The predominant stage of the life cycle of a moss is the gametophyte which consists of two stages. The second stage is the ___________ stage.

A) Agar B) Leafy
C) Chlorella D) protonema
 
Answer & Explanation Answer: B) Leafy

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Q:

__________gives hardness to stainless steel.

A) Zinc B) Carbon
C) Lead D) Tin
 
Answer & Explanation Answer: B) Carbon

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Q:

In the reaction H2O2 + Cl2 -----> 2HCl + O2, H2O2 acts as

A) an acid B) an oxidising agent
C) a reducing agent D) a base
 
Answer & Explanation Answer: C) a reducing agent

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