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 Chemistry Questions

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Q:

Match the following items.

A) I – 2, II – 3, III – 4, IV – 1 B) I – 2, II – 3, III – 1, IV – 4
C) I – 3, II – 2, III – 1, IV – 4 D) I – 2, II – 1, III – 3, IV – 4
 
Answer & Explanation Answer: A) I – 2, II – 3, III – 4, IV – 1

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Q:

Which of the following metals displaces Iron from Iron Chloride?

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

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Q:

‘Plum  Pudding  Model’  for  an  atom  was proposed by

A) Antoine Lavoisier B) Robert Boyle
C) Ernest Rutherford D) J. J. Thomson
 
Answer & Explanation Answer: D) J. J. Thomson

Explanation:

The   first   model   of   atom   was proposed   by   J.   J.   Thomson   in 1898.According  to  this  model,  the positive   charge   of   the   atom   is uniformly   distributed   throughout the  volume  of  the  atom  and  the negatively  charged  electrons  are embedded  in  it  like  seeds  in  a watermelon.    This    model    was picturesquely  called  plum  pudding model of the atom

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Q:

In which of the following solution the concentration of H+ ion is the maximum?

A) pH 6 B) pH 8
C) pH 5 D) pH 9
 
Answer & Explanation Answer: C) pH 5

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2 1077
Q:

By volume, 78% of air is _______________

A) nitrogen B) oxygen
C) hydrogen D) helium
 
Answer & Explanation Answer: A) nitrogen

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2 1077
Q:

Crystallisation is an example of?

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

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2 1076
Q:

Which of the following is used in the preparation of tincture iodine, cough syrup and many tonics?

A) Methanol B) Ethanoic acid
C) Acetic acid D) Ethanol
 
Answer & Explanation Answer: D) Ethanol

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2 1074
Q:

How many groups and periods are present in the Modern Periodic Table?

A) 9 groups, 9 periods B) 7 groups, 8 periods
C) 18 groups, 7 periods D) 8 groups, 7 periods
 
Answer & Explanation Answer: C) 18 groups, 7 periods

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