Question

Please give me this questions solutions. ...

Answer 1

Answer (4) :

(i) Substance X is calcium oxide or quicklime. Its chemical formula is CaO.

(ii) Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime).

$CaO \ (s) + H_{2}O \ (l) \longrightarrow Ca(OH)_{2} \ (aq)\\X \ \ \ \ \ \ \ \ \ \ \ Water \ \ \ \ \ \ \ \ \ \ Slaked \ lime \ (Calcium \ hydroxide)$

Answer (5) : A chemical equation in which the total number of atoms of each element is same on both sides, i.e., reactants and products, is called a balanced chemical equation.

An equation should be balanced in order to satisfy 'law of conservation of mass'.

Answer (6) :

(i) $3H_{2} (g) + N_{2}(g) \longrightarrow 2NH_{3} (g)$

(ii) $2H_{2}S (g) + 3O_{2}(g) \longrightarrow 2H_{2}O(l) + 2SO_{2}(g)$

(iii) $3BaCl_{2}(aq) + Al_{2}(SO_{4})_{3} (Aq) \longrightarrow 2AlCl_{3}(aq) + 3BaSO_{4} \downarrow$

(iv) $2K(s) + 2H_{2}O (l) \longrightarrow 2KOH(aq) + H_{2} \uparrow$