Question 18 Which of the following are combination reactions-i 2 KClO 3Heat - 2 KCl -3 O 2ii MgO - H 2 O - Mg OH 2iii 4 Al -3 O 2- 2 Al 2 O 3iv Zn - FeSO 4- ZnSO 4- Fea i and iiib iii and ivc ii and ivd ii and iii

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Standard IX

Chemistry

Types of Chemical Reaction

Question 18 W...

Question

Question 18
Which of the following are combination reactions?

(i) $2 {KClO}_{3} Heat \to 2 KCl + 3 O_{2}$
(ii) $MgO + H_{2} O \to {Mg(OH)}_{2}$
(iii) $4 Al + 3 O_{2} \to 2 {Al}_{2} O_{3}$
(iv) $Zn + {FeSO}_{4} \to {ZnSO}_{4} + Fe$

(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iv)
(d) (ii) and (iii)

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Solution

A reaction in which two or more reactants react together to form a single product is called a combination reaction. In reaction (ii), $MgO$ and $H_{2} O$ are combining to form ${Mg(OH)}_{2}$ and in reaction (iii), $Al$ and $O_{2}$ are combining to form ${Al}_{2} O_{3}$ .

In reaction (i), $2 {KClO}_{3}$ is undergoing thermal decomposition, hence it is a decomposition reaction whereas reaction (iv) is a single displacement reaction.

So, Option (d) is correct.

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Similar questions

Q. Question 18
Which of the following are combination reactions?

(i)

2 {KClO}_{3} Heat \to 2 KCl + 3 O_{2}

(ii)

MgO + H_{2} O \to {Mg(OH)}_{2}

(iii)

4 Al + 3 O_{2} \to 2 {Al}_{2} O_{3}

(iv)

Zn + {FeSO}_{4} \to {ZnSO}_{4} + Fe

(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iv)
(d) (ii) and (iii)

Q. Which of the following is/are combination reaction(s)?
(i)

2 K C l O_{3} H e a t \to 2 K C l + 3 O_{2}

(ii)

M g O + H_{2} O \to M g (O H)_{2}

(iii)

4 A l + 3 O_{2} \to 2 A l_{2} O_{3}

(iv)

Z n + F e S O_{4} \to Z n S O_{4} + F e

Which of the following are combination reactions?

i) 4K + O₂ → 2K₂O

ii) CuSO₄+ 2NH₄OH → (NH₄)₂SO₄+ Cu(OH)₂

iii) 2ZnS + 3O₂ → 2ZnO + 2SO₂

iv) Na₂O + H₂O → 2NaOH

Q. Which of the following alkyl halides gives the same product in both

S_{N} 1 & S_{N} 2

reactions?

Question 10

Consider the list of terms given below:
(i) Tsunami
(ii) Landslides
(iii) Floods
(iv) Lightning
Earthquakes can cause
(a) (i), (ii) and (iii)
(b) (ii) and (iv)
(c) (ii), (iii) and (iv)
(d) (iii) and (iv)

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Types of Chemical Reaction

Standard IX Chemistry

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Question 18 Which of the following are combination reactions? (i) 2KClO3Heat→2KCl+3O2 (ii) MgO+H2O→Mg(OH)2 (iii) 4Al+3O2→2Al2O3 (iv) Zn+FeSO4→ZnSO4+Fe (a) (i) and (iii) (b) (iii) and (iv) (c) (ii) and (iv) (d) (ii) and (iii)