Which of the following chemical reaction is balanced as well as is combustion reaction?

C_{3} H_{8} + 5 O_{2} \to 3 C O_{2} + 4 H_{2} O

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6 C O_{2} + 12 H_{2} O \to C_{6} H_{12} O_{6} + 6 O_{2} + 6 H_{2} O

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C_{3} H_{6} + 4 O_{2} \to 3 C O_{2} + 2 H_{2} O

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A l + 3 H_{2} S O_{4} \to A l_{2} (O_{4})_{3} + 2 H_{2}

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Solution

The correct option is A $C_{3} H_{8} + 5 O_{2} \to 3 C O_{2} + 4 H_{2} O$
A. $C_{3} H_{8} + 5 O_{2} \to 3 C O_{2} + 4 H_{2} O$
This reaction is balanced and is an example of commbustion because a hydrocarbon reacts with oxygen to give $C O_{2}$ and $H_{2} O$

B. $6 C O_{2} + 12 H_{2} O \to C_{6} H_{12} O_{6} + 6 O_{2} + 6 H_{2} O$
This is a balanced reaction but is not combustion because $O_{2}$ is very essential for combustion. So $O_{2}$ should be present as reactant.

C. $C_{3} H_{6} + 4 O_{2} \to 3 C O_{2} + 2 H_{2} O$
This is not a balanced reaction as hydrogen atom on left side are $6$ and on right side are $4$ .

D. $A l + 3 H_{2} S O_{4} \to A l_{2} (O_{4})_{3} + 2 H_{2}$
This reaction is neither balanced nor an example of combustion.

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Question 27
Which of the following equations is the summary of photosynthesis?

(a) $6 CO_2 + 12 H_2 O \rightarrow C_6H_{12}O_6+6O_2 + 6H_2O$
(b) $6CO_2+H_2O+Sunlight \rightarrow C_6 H_{12}O_6+O_2+6H_2O$
(c) $6CO_2+12H_2O+Chlorophyll+Sunlight \rightarrow C_6H_{12}O_6 + 6O_2 + 6H_2O$
(d) $6CO_2 + 12H_2O + Chlorophyll+Sunlight \rightarrow C_6 H_{12}O_6 + 6CO_2+6H_2O$