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Chemistry : General Chemistry


Answer the following questions by choosing the most appropriate option.

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Multiple choice

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1.

The lead of a pencil mainly contains _______.

  graphite

  carbon black

  lead

  plastics

  Half-n-half Clue
 

2.

What is the combination of any substance with oxygen known as?

  Combustion

  Hydrogenation

  Reduction

  Oxidation

  Half-n-half Clue
 

3.

Fill in the missing word:
Acid + _______ = Salt + Water

  Base

  Oxygen

  Metal

  Non Metal

  Half-n-half Clue
 

4.

A pH below 7 indicates _______.

  purity of the sample

  presence of ions

  alkalinity

  acidity

  Half-n-half Clue
 

5.

Heat is liberated in _______ reactions.

  substitution

  exothermic

  all chemical

  endothermic

  Half-n-half Clue
 

6.

The 'fizz' in soft drinks is caused by _______.

  helium

  hydrogen

  Carbon dioxide

  nitrogen

  Half-n-half Clue
 

7.

Catalysts speed up the rate of chemical reactions.

  True

  False

 


 
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