Question 12 Marks
A displacement reaction in which a metal above hydrogen in the reactivity series, displaces another metal from the solution of its compound.
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Question 22 Marks
A catalytic, reversible, exothermic reaction.
Answer
View full question & answer→A catalytic, reversible, exothermic reaction.
$\ce{2SO_2 + O_2 \underset{450^{\circ} C }{\stackrel{ V_2O_5}{\rightleftharpoons}} 2SO_3 + \Delta}$
$\ce{N_2 + 3H_2 \underset{450-500^{\circ} C }{\stackrel{ Fe }{\rightleftharpoons}} 2NH_3 + Heat}$
$\ce{2SO_2 + O_2 \underset{450^{\circ} C }{\stackrel{ V_2O_5}{\rightleftharpoons}} 2SO_3 + \Delta}$
$\ce{N_2 + 3H_2 \underset{450-500^{\circ} C }{\stackrel{ Fe }{\rightleftharpoons}} 2NH_3 + Heat}$
Question 32 Marks
A thermal decomposition reaction in which a metallic nitrate decomposes to give $–$ a basic oxide.
Answer
View full question & answer→Metallic nitrate is calcium nitrate on thermal decomposition gives $\ce{CaO}$ which is a basic oxide.
Question 42 Marks
A reaction of direct combination i.e. synthesis In which two gases combine to give another gas $–$ which turns lime
water milky.
water milky.
Answer
View full question & answer→Synthesis when two gases combine to give a gas which turns lime water milky.
Question 52 Marks
A thermal decomposition reaction in which a compound decomposes to give two new compounds.
Question 62 Marks
Differentiate between $–$
$(a)$ Direct combination reaction $\&$ a decomposition reaction
$(b)$ Displacement reaction $\&$ a neutralization reaction.
$(a)$ Direct combination reaction $\&$ a decomposition reaction
$(b)$ Displacement reaction $\&$ a neutralization reaction.
Answer
View full question & answer→$(a)$ Direct combination: "Is a reaction in which two elements ' or compound combine to give one new compound."
$C + \ce{O_2 \rightarrow CO_2}$
Decomposition reaction: "A chemical compound $($breaks up$)$ decomposes into two or more simpler substances."
Copper carbonate $\rightarrow$ Copper oxide + carbon dioxide
$\ce{CuCO_3 \rightarrow CuO}+\ce{CO_2}$
$(b)$ Displacement reaction : “A chemical reaction in which an element displaces the element from a solution of its compound.”
In a activitiy series of metals, an element placed higher displaces the element placed below it.
Here $Zn$ is placed above $Cu$ in activity series of metal and is more reactive than copper has displaced $Cu$ from copper sulphate.
Neutralization reaction :
“A reaction between an acid and a base to form salt and water is called neutralization reaction.”
$C + \ce{O_2 \rightarrow CO_2}$
Decomposition reaction: "A chemical compound $($breaks up$)$ decomposes into two or more simpler substances."
Copper carbonate $\rightarrow$ Copper oxide + carbon dioxide
$\ce{CuCO_3 \rightarrow CuO}+\ce{CO_2}$
$(b)$ Displacement reaction : “A chemical reaction in which an element displaces the element from a solution of its compound.”
In a activitiy series of metals, an element placed higher displaces the element placed below it.
Here $Zn$ is placed above $Cu$ in activity series of metal and is more reactive than copper has displaced $Cu$ from copper sulphate.
Neutralization reaction :
“A reaction between an acid and a base to form salt and water is called neutralization reaction.”
Question 72 Marks
State why a direct combination reaction is called a $–$ ‘synthesis reaction’.
Answer
View full question & answer→When two or more substances $[$element with element or element with compound or compound with another compound$]$ combine to form a new compound with new properties. Hence direct combination is called ‘synthesis reaction’.
Example :
Hydrogen $($a gas$) +$ Oxygen $($a gas$)$ combines to form water $($liquid$)$.
$\ce{2H_2}+ \ce{O_2 \rightarrow 2H_2O}$
Example :
Hydrogen $($a gas$) +$ Oxygen $($a gas$)$ combines to form water $($liquid$)$.
$\ce{2H_2}+ \ce{O_2 \rightarrow 2H_2O}$