Question Text
Question 1 :
Translate the following statements into chemical equations and then balance them:
Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
Question 2 :
Write the balanced chemical equation for the following and identify the type of reaction in each case:
Zinc carbonate (s) $\rightarrow$ Zinc oxide (s)+ Carbon dioxide (g)
Question 3 :
A shiny brown coloured element X on heating in air becomes black in colour. Name the element X and the black coloured compound formed.
Question 4 :
What happens when dilute hydrochloric acid is added to iron filings?
Question 5 :
Write the balanced chemical equations for the following reactions:
Calcium hydroxide + Carbon dioxide $\rightarrow$ Calcium carbonate + Water
Question 6 :
A solution of a substance 'X' is used for white washing
Name the substance 'X'.
Question 7 :
Write the balanced chemical equation for the following and identify the type of reaction in each case:
Magnesium (s)+ Hydrochloric acid (aq) $\rightarrow$ Magnesium chloride (aq) + Hydrogen (g)
Question 8 :
Identify the substances that are oxidised in the following reactions.
$4Na(s) + O_{2}(g) \rightarrow 2Na_{2}O(s)$
Question 9 :
Oil and fat containing food items are flushed with nitrogen. Why?
Question 10 :
Why does the colour of copper sulphate solution change when an iron nail is dipped in it?