Which among the following is are double displacement reactions- i Pb - CuCl2 -PbCl2 - Cu ii Na2SO4 - BaCl2 -BaSO4 - 2NaCl iii C - O2 -CO2 iv CH4 - 2O2 -CO2 - 2H2O a i and iv b ii only c i and ii d iii and iv

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Double Displacement Reaction

Which among t...

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Question 7

Which among the following is (are) double displacement reaction(s)?

(i) $Pb + {CuCl}_{2} \to {PbCl}_{2} + Cu$
(ii) ${Na}_{2} {SO}_{4} + {BaCl}_{2} \to {BaSO}_{4} + 2 NaCl$
(iii) $C + O_{2} \to {CO}_{2}$
(iv) ${CH}_{4} + 2 O_{2} \to {CO}_{2} + 2 H_{2} O$

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

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Pb + {CuCl}_{2} \to {PbCl}_{2} + Cu

{Na}_{2} {SO}_{4} + {BaCl}_{2} \to {BaSO}_{4} + 2 NaCl

C + O_{2} \to {CO}_{2}

{CH}_{4} + 2 O_{2} \to {CO}_{2} + 2 H_{2} O

P b + C u C l_{2} \to P b C l_{2} + C u

N a_{2} S O_{4} + B a C l_{2} \to B a S O_{4} + 2 N a C l

C + O_{2} \to C O_{2}

C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O

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