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

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

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)

No worries! We‘ve got your back. Try BYJU‘S free classes today!

(iii) and (iv)

No worries! We‘ve got your back. Try BYJU‘S free classes today!

(ii) and (iv)

No worries! We‘ve got your back. Try BYJU‘S free classes today!

(ii) and (iii)

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

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 $D$ .

Suggest Corrections

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 :

Join BYJU'S Learning Program

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