Combination Reaction

Q. Identify the combination reaction(s) among the following:

1. $2C_8{H}_{18}+25O_2\to 16C{O}_2+18H_{2}O$
2. $8Fe+S_8\to 8FeS$
3. $MgO+C{O}_2\to MgC{O}_3$
4. $3Pb(N{O}_3{)}_2+2AlC{l}_3\to 3PbC{l}_2+2Al(N{O}_3{)}_3$

Q. Balance the following chemical equations and identify the type of chemical reaction.

(a) $\text{HgO(s)}\stackrel{\text{Heat}}{\to }\text{Hg(l)}+{\text{O}}_2\text{(g)}$
(b) $\text{Na(s)}+\text{S(s)}\stackrel{\text{Fuse}}{\to }{\text{Na}}_2\text{S(s)}$
(c) ${\text{TiCl}}_4\text{(l)}+\text{Mg(s)}\to \text{Ti(s)}+{\text{MgCl}}_2\text{(s)}$
(d) $\text{CaO(s)}+{\text{SiO}}_2\text{(s)}\to {\text{CaSiO}}_3\text{(s)}$
(e) ${\text{H}}_2{\text{O}}_2\text{(l)}\stackrel{\text{UV}}{\to }{\text{H}}_2\text{O(l)}+{\text{O}}_2\text{(g)}$

Q. Identify the general representation of a combination reaction.

1. $\text{A+B}\to \text{AB}$
2. $\text{A+B}\to \text{B+C}$
3. $\text{AB}\to \text{A+B}$
4. $\text{A+B+C}\to \text{X+Y}$

Q.

A reaction in which a single product is formed from two or more reactants is known as __ reaction.

Q. $\text{C(s)}+{\text{O}}_2\text{(g)}\to {\text{CO}}_2\text{(g)}$

Identify the type of chemical reaction.

1. Double displacement reaction
2. Displacement reaction
3. Decomposition reaction
4. Combination reaction

Q.

A reaction in which a single product is formed from two or more reactants is known as __.

Q. Which of the following compound is obtained when quicklime reacts with water?

1. ${\text{Ca(NO}}_3{)}_2$
2. ${\text{Ca(OH)}}_2$
3. ${\text{Ca(HCO}}_3{)}_2$
4. ${\text{CaCO}}_3$

Q.

Which of the following are examples of combination reactions?

(i) $CaO+O_2\to 2CaC{O}_3$

(ii) $CaC{O}_3\to CaO+C{O}_2$

(iii) $MgO+C{O}_2\to MgC{O}_3$

(iv) $Fe+S\to FeS$

(v) $2AgCl+sunlight\to 2Ag+C{l}_2$

(vi) $C{H}_4+2O_2\to C{O}_2+2H_{2}O$

(vii) $N{a}_{2}O+H_{2}O\to 2NaOH$

1. (ii), (vii), (iv), (vi)

2. (i), (ii), (v), (vii)

3. (ii), (iii), (iv), (vi)

4. (i), (iii), (iv), (vii)

Q.

Formation of water is an example of ____________ reaction

1. Chemical and combination reaction

2. Combination reaction

3. Chemical reaction

4. Substitution reaction

Q. Complete the statements:
The probability of an event that is certain to happen is ___ .
Such an event is called ___