Chemical Reactions and Equations

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Question

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Question 1 :

Magnesium ribbon should be cleaned before burning in air ............... .

1. to make it stable
2. to make it is more reactive
3. to remove layer of magnesium oxide
4. to make it unstable
Answer
15128

Question 2 :

The layer of Magnesium Oxide formed on the Magnesium ribbon is ........

1. stable
2. unstable
3. reactive
4. a & b above
Answer
15129

Question 3 :

Magnesium is .......... metal.

1. stable
2. reactive
3. non-reactive
4. a & b above
Answer
15130

Question 4 :

Write the balanced equation for the following chemical reactions.

Hydrogen + Chlorine ? Hydrogen Chloride

Answer
15131

Question 5 :

When an iron nail is dipped in Copper Sulphate solution, the colour of the solutions turns ........ .

1. blue
2. rust coloured
3. brown
4. green
Answer
15132