Write the balanced equation for the following chemical reactions.
$(i)$ Hydrogen $+$ Chlorine $\to $ Hydrogen chloride
$(ii)$ Barium chloride $+$ Aluminium sulphate $\to $ Barium sulphate $+$ Aluminium chloride
$(iii)$ Sodium $+$ Water $\to $ Sodium hydroxide $+$ Hydrogen
$(i)$ $H _{2(g)}+ Cl _{2(g)} \longrightarrow 2 HCl _{(g)}$
$(ii)$ $3 BaCl _{2(s)}+ Al _{2}\left( SO _{4}\right)_{3(s)} \longrightarrow 3 BaSO _{4(s)}+2 AlCl _{3(s)}$
$(iii)$ $2 Na _{(s)}+2 H _{2} O _{(i)} \longrightarrow 2 NaOH _{(a q)}+ H _{2(g)}$
Write the balanced chemical equations for the following reactions.
$(a)$ Calcium hydroxide $+$ Carbon dioxide $\rightarrow$ Calcium carbonate $+$ Water
$(b)$ Zinc $+$ Silver nitrate $\rightarrow$ zinc nitrate $+$ Silver
$(c)$ Aluminium $+$ Copper chloride $\rightarrow$ Aluminium chloride $+$ Copper
$(d)$ Barium chloride$+$ Potassium sulphate $\rightarrow$ Barium sulphate $+$ Potassium chloride
Which of the statements about the reaction below are incorrect ?
$2 PbO _{( s )}+ C _{( s )} \longrightarrow 2 Pb _{( s )}+ CO _{2( g )}$
$(a)$ Lead is getting reduced.
$(b)$ Carbon dioxide is getting oxidised.
$(c)$ Carbon is getting oxidised.
$(d)$ Lead oxide is getting reduced.
A shiny brown coloured element $‘X’$ on heating in air becomes black in colour. Name the element $‘X’$ and the black coloured compound formed.
Oil and fat containing food items are flushed with nitrogen. Why ?
What do you mean by a precipitation reaction? Explain by giving examples.