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Q:

In modern periodic table while going from top to bottom in a group ______.

 

A) size of an atom increases B) size of an atom decreases
C) ionisation energy of an atom increases D)  size and ionisation energy of an atom increases

Answer:   D)  size and ionisation energy of an atom increases



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Subject: Chemistry
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Answer & Explanation Answer: A) Amphoteric oxides

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Which of the following metals does NOT react with cold or hot water?

A) Aluminium B) Potassium
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Metals are placed on which side of the Modern Periodic table?

A) Top row B) Left side
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Answer & Explanation Answer: B) Left side

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What enables an electric current to flow in a circuit?

 

A) The motion of electrons B) The motion of neutrons
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Answer & Explanation Answer: A) The motion of electrons

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The pH value increase from 7 to 14 represents a

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Answer & Explanation Answer: C) increase in OH- ion concentration

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Which of the following salts is acidic in nature?

A) Sodium Carbonate B) Ammonium Phosphate
C) Magnesium Sulphate D) Sadium Acetate
 
Answer & Explanation Answer: A) Sodium Carbonate

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The credit for classifying the elements on the basis of their atomic masses goes to

A) John Dalton B) John Alexander Reina Newlands
C) Dmitri Mendeleev D) Johann Wolfgang Dobereiner
 
Answer & Explanation Answer: C) Dmitri Mendeleev

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___ is amphoteric in nature.

A) SO2 B) CaO
C) ZnO D) N2O
 
Answer & Explanation Answer: C) ZnO

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