1What type of chemical reaction is the reaction between sodium chloride and silver nitrate? (combination, single displacement, decomposition, double displacement)
2What type of reaction is \( \mathrm{4Na + O_2 \rightarrow 2Na_2O} \)? (addition, decomposition, acid base, displacement)
3Which substance is X in \( \mathrm{HCl + X \rightarrow NaCl + H_2O} \)? (NaOH, Na, NaH, Na and H₂O)
4What type of reaction is the heating of \( \mathrm{CaCO_3} \)?
5Give reason: Acid base reaction is also known as neutralisation reaction.
6Write the differences between single and double displacement reaction.
7Write the differences between combination and decomposition reaction.
8Balance \( \mathrm{KClO_3 \rightarrow KCl + O_2} \) and mention its type.
9Balance \( \mathrm{CH_4 + O_2 \rightarrow CO_2 + H_2O} \) and mention its type.
10Balance \( \mathrm{Fe + O_2 \rightarrow Fe_2O_3} \) and mention its type.
11Balance \( \mathrm{Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2} \) and mention its type.
12Balance \( \mathrm{Al + H_2SO_4 \rightarrow Al_2(SO_4)_3 + H_2} \) and mention its type.
13What do you mean by a displacement reaction? Write two examples with their balanced chemical equations.
14Write two examples of decomposition reactions with balanced chemical equations.
15An iron nail hung on a thread is dipped in copper sulphate solution in a test tube. What type of chemical reaction occurs inside the test tube? Write its balanced chemical equation.
16Four students A, B, C and D are asked to carry out a decomposition reaction in the laboratory. A burns a magnesium ribbon, B mixes zinc in iron sulphate solution, C heats potassium chlorate in a hard glass test tube, and D mixes zinc with hydrochloric acid. Which student followed the correct procedure? Write the balanced equation of that process.
17Samir burns a magnesium ribbon. It burns brightly and forms a white ash 'A'. Write the name of substance 'A' and a balanced chemical equation of the process.
18What is a radical? Give two examples.
19Why is there no change when a piece of copper is placed in zinc sulphate solution?
20Why is photosynthesis not a combination reaction even though two substances join in it?
21What is a precipitate? Which precipitate forms when barium chloride reacts with sodium sulphate?
22Why is an acid base reaction counted as a kind of double displacement reaction?