Question Text
Question 1 :
Write the balanced chemical equations for the following reactions:
Calcium hydroxide + Carbon dioxide $\rightarrow$ Calcium carbonate + Water
Question 2 :
Balance the following chemical equations:
$NaOH + H_{2}SO_{4} \rightarrow Na_{2}SO_{4} + H_{2}O$
Question 3 :
Translate the following statements into chemical equations and then balance them:
Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
Question 4 :
Identify the substances that are reduced in the following reactions.
$4Na(s) + O_{2}(g) \rightarrow 2Na_{2}O(s)$
Question 5 :
Write the balanced chemical equations for the following reactions:
Zinc+ Silver nitrate $\rightarrow$ Zinc nitrate + Silver
Question 6 :
Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Question 7 :
Identify the substances that are oxidised in the following reactions.
$CuO(s)+ H_{2}(g) \rightarrow Cu(s)+ H_{2}O(l)$
Question 8 :
Give an example of a double displacement reaction other than the reaction of barium chloride with sodium sulphate.
Question 10 :
Write the balanced chemical equation for the following and identify the type of reaction in each case:
Potassium bromide (aq) + Barium iodide (aq) $\rightarrow$ Potassium iodide (aq) + Barium bromide (s)
Question 15 :
Which of the following is not one of the reactants to produce baking soda?
Question 16 :
How do indicators tell us about the acidic or basic property of a substance?
Question 18 :
What is the colour of impure salt crystals found across the world?
Question 20 :
Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is neutral?
