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 Chemistry Questions

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Q:

Harmful bacteria in drinking water cannot be destroyed by 

A) Chlorination B) boiling
C) adding caustic soda D) ozonisation
 
Answer & Explanation Answer: C) adding caustic soda

Explanation:

Water containing caustic soda cannot be used for drinking

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1 4123
Q:

The compound MgCl2 is named

A) Magnesium Chloride B) Magnesium Chlorine
C) Magnesium Dichloride D) Dimagnesium Chloride
 
Answer & Explanation Answer: A) Magnesium Chloride

Explanation:

The compound MgCl2 is named as Magnesium Chloride.

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2 4112
Q:

Antimony is

A) metal B) non metal
C) non metaloid D) metalloid
 
Answer & Explanation Answer: D) metalloid

Explanation:
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3 4108
Q:

All of the following are constituents of RNA molecule except _____

A) Thymine B) Adenine
C) Uracil D) Guanine
 
Answer & Explanation Answer: A) Thymine

Explanation:
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16 4104
Q:

In addition to nitric acid, another acid which may render iron passive is 

A) acetic acid B) oxalic acid
C) chromic acid D) citric acid
 
Answer & Explanation Answer: C) chromic acid

Explanation:

Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide Fe3O4on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive. 

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2 4100
Q:

The oldest known organic compound is

A) Urea B) Methane
C) Acetic acid D) Benzene
 
Answer & Explanation Answer: C) Acetic acid

Explanation:

In the form of vinegar, acetic acid is known from very early times. It is got by oxidation of fermented liquors (10-15%, alcohol) by air under the influence of a bacteria called 'mycoderma acetic'

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4 4059
Q:

Number of moles of CO2 present in 24 grams of carbon is

A) 0.5 B) 1
C) 2 D) 0.25
 
Answer & Explanation Answer: C) 2

Explanation:

1 mole of CO2 contain 12gms of carbon and 44 gms of CO2

therefore  24 gms of carbon is present in 88 gms of CO2 or 2 moles of CO2

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7 4057
Q:

Number of moles of solute present in 1 litre of solution is

A) Normality B) Molarity
C) Molality D) Formality
 
Answer & Explanation Answer: B) Molarity

Explanation:

Moles of solute present in 1 litre or 1000ml of solution is called molarity

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5 4051