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 Chemistry Questions

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Q:

Elements that are poor conductors of heat and electricity are

A) Metals B) Non metals
C) Halogens D) Noble
 
Answer & Explanation Answer: B) Non metals

Explanation:

Elements that are poor conductors of heat and electricity are called Non metals.

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3 1607
Q:

Tooth decay starts when the pH of the mouth is lower than

A) 5.7 B) 5.5
C) 5.6 D) 5.4
 
Answer & Explanation Answer: B) 5.5

Explanation:
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0 1606
Q:

The biogas used for cooking is a mixture of which of the following ?

A) Carbon dioxide & oxygen B) Isobutane & propane
C) Methane & carbon monoxide D) Methane & carbon dioxide
 
Answer & Explanation Answer: D) Methane & carbon dioxide

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4 1604
Q:

Which base is present in lime water?

A) Sodium hydroxide B) Magnesium hydroxide
C) Calcium hydroxide D) Ammonium hydroxide
 
Answer & Explanation Answer: C) Calcium hydroxide

Explanation:
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1 1603
Q:

Most liquids that conduct electricity are solutions of acids, bases and ______.

A) Copper B) Aluminium
C) Salts D) Iron
 
Answer & Explanation Answer: C) Salts

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0 1603
Q:

Safety matches contain

A) Sulphur B) Phosphorus
C) Magnesium D) Potassium
 
Answer & Explanation Answer: B) Phosphorus

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20 1602
Q:

Which process usually requires water?

A) Physical weathering B) Mass wasting
C) Chemical weathering D) Erosion
 
Answer & Explanation Answer: C) Chemical weathering

Explanation:

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic.

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4 1598
Q:

Which of the following acts as best adsorbent?

A) Charcoal B) Activated Charcoal
C) Activated Coconut Charcoal D) Carbon black
 
Answer & Explanation Answer: C) Activated Coconut Charcoal

Explanation:
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