Question

An ordered list of chemical substances is shown.

1. CuO
2. O2
3. Cu2O
4. N2
5. C2H5NH2
6. Li2O

Which substances in the list can be some of the reactants and products in the same combustion reaction?

Answer Choices:
A. 1, 2, and 4
B. 2, 3, and 6
C. 2, 4, and 5
D. 1, 2, and 5

Answer 1

Answer : The correct option is, (C) 2, 4 and 5.

Explanation :

Combustion reaction : It is a type of reaction in which a hydrocarbon react with an oxygen molecule to give carbon dioxide, water as a product.

For example : Methane react with oxygen to give carbon dioxide and water.

$CH_4+2O_2\rightarrow CO_2+2H_2O$

In the given list of chemical substances, $CuO,Cu_2O,Li_2O$ are in oxide form. They can not be both reactant and product of a single combustion reaction.

In the given list, $C_2H_5NH_2$ is the only hydrocarbon which shows a combustion reaction. That means $C_2H_5NH_2$ react with $O_2$ to give $CO_2,H_2O$ and $N_2$ as a product.

The balanced combustion reaction of $C_2H_5NH_2$ is,

$20C_2H_5NH_2+40O_2\rightarrow 40CO_2+7H_2O+10N_2$

Therefore, the correct answer is, (C) 2, 4, and 5.

Answer 2

Answer:

the anser is C

Explanation:

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