Which of the following are combination reactions-i 4 K - O 2- 2 K 2 Oii CuSO 4-2 NH 4 OH - NH 42 SO 4- Cu OH 2iii 2 ZnS -3 O 2- 2 ZnO -2 SO 2iv Na 2 O - H 2 O - 2 NaOHA- Reactions i and iiB- Reactions ii and iiiC- Reactions i and ivD- Reactions ii and iv

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Byju's Answer

Standard VIII

Chemistry

Oxidation Reduction Reaction

Which of the ...

Question

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

Reactions (i) and (iv)

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Reactions (ii) and (iv)

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Reactions (i) and (ii)

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Reactions (ii) and (iii)

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Solution

The correct option is A
Reactions (i) and (iv)

A chemical reaction in which two or more substances combine to form a single product is called a combination reaction.

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Similar questions

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

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)

Q. Which of the following reaction(s) has a positive entropy change?

(I) A g^{+} (a q) + C l^{-} (a q) \to A g C l (s) (I I) N H_{4} C l (s) \to N H_{3} (g) + H C l (g) (I I I) 2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)

Which of the following are examples of combination reaction?

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

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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

The correct option is A Reactions (i) and (iv) A chemical reaction in which two or more substances combine to form a single product is called a combination reaction.

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

The correct option is A
Reactions (i) and (iv)

A chemical reaction in which two or more substances combine to form a single product is called a combination reaction.