Which of the following is-are combination reactions-i 2KClO3Heat- 2KCl - 3O2ii MgO - H2O - MgOH2iii 4Al - 3O2- 2Al2 O3iv Zn - FeSO4- ZnSO4 - Fe

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Standard X

Chemistry

Precipitation Reaction

Which of the ...

Question

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

(i) and (iii)

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(iii) and (iv)

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(ii) and (iv)

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(ii) and (iii)

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Solution

The correct option is D (ii) and (iii)
Option (i) is a decomposition reaction.
Option (ii) is a combination reaction as magnesium oxide $(M g O)$ and water combines to form magnesium hydroxide $(M g (O H)_{2})$ .
Option (iii) is again a combination reaction as aluminium $(A l)$ combines with oxygen $(O_{2})$ to form aluminium oxide $(A l_{2} O_{3})$ .
Option (iv) is a displacement reaction.
The correct answer is option $D$ .

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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. 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)

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

Which of the following are examples of combination reactions?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

A l

and

K C l O_{3}

react together to form

A I_{2} O_{3}

according to the following reaction:

2 K C l O_{3} ⟶ 2 K C l + 3 O_{2}

4 A l + 3 O_{2} ⟶ 2 A l_{2} O_{3}

4

moles of

K C l O_{3}

(

50 %

pure) on reaction with excess of

A l

forms

A l_{2} O_{3}

equal to :

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Which of the following is/are combination reaction(s)?(i) 2KClO3Heat→2KCl+3O2(ii) MgO+H2O→Mg(OH)2(iii) 4Al+3O2→2Al2O3(iv) Zn+FeSO4→ZnSO4+Fe

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