Question 1 :
Translate the following statements into chemical equations and then balance them:
Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
Question 2 :
Identify the substances that are reduced in the following reactions.
$4Na(s) + O_{2}(g) \rightarrow 2Na_{2}O(s)$
Question 3 :
A solution of a substance 'X' is used for white washing
Name the substance 'X'.
Question 4 :
Balance the following chemical equations:
$NaCl + AgNO_{3} \rightarrow AgCl + NaNO_{3}$
Question 5 :
Oil and fat containing food items are flushed with nitrogen. Why?
Question 6 :
Balance the following chemical equations:
$BaCl_{2} + H_{2}SO_{4} \rightarrow BaSO_{4} + HCl$
Question 8 :
Write the balanced chemical equations for the following reactions:
Barium chloride + Potassium sulphate $\rightarrow$ Barium sulphate + Potassium chloride
Question 9 :
Give an example of a double displacement reaction other than the reaction of barium chloride with sodium sulphate.
Question 10 :
Translate the following statements into chemical equations and then balance them:
Hydrogen gas combines with nitrogen to form ammonia.
Question 11 :
Translate the following statements into chemical equations and then balance them:
Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Question 12 :
What happens when dilute hydrochloric acid is added to iron filings?
Question 14 :
Identify the substances that are oxidised in the following reactions.
$4Na(s) + O_{2}(g) \rightarrow 2Na_{2}O(s)$
Question 15 :
Which of the statements about the reaction below are incorrect?
2PbO(s) + C(s) $\rightarrow$ 2Pb(s) + $CO_{2}(g)$
(i) Lead is getting reduced
(ii) Carbon dioxide is getting oxidised
(iii) Carbon is getting oxidised
(iv) Lead oxide is getting reduced
Question 16 :
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 17 :
The following reaction is an example of :
$Fe_{2}O_{3} + 2Al \rightarrow Al_{2}O_{3} + 2Fe$
Question 18 :
Balance the following chemical equations:
$HNO_{3} + Ca(OH)_{2} \rightarrow Ca(NO_{3})_{2} + H_{2}O$
Question 19 :
Identify the substances that are oxidised in the following reactions.
$CuO(s)+ H_{2}(g) \rightarrow Cu(s)+ H_{2}O(l)$
Question 20 :
Balance the following chemical equations:
$NaOH + H_{2}SO_{4} \rightarrow Na_{2}SO_{4} + H_{2}O$