Single Choice

The minimum amount of $$O_{2}(g)$$ consumed per gram of reactant is for the reaction: (Given atomic mass : $$Fe = 56, O = 16, Mg = 24, P = 31, C = 12, H = 1)$$.

A$$C_{3}H_{g} + 5O_{2}(g) \rightarrow 3CO_{2}(g) + 4H_{2}O(l)$$
B$$P_{4}(s) + 5O_{2}(g) \rightarrow P_{4}O_{10}(s)$$
C$$4Fe(s) + 3O_{2}(g) \rightarrow 2FeO_{3}(s)$$
Correct Answer
D$$2Mg(s) + O_{2}(g) \rightarrow 2 MgO(s)$$

Solution

$$C_{3}H_{g} + 5O_{2}(g) \rightarrow 3CO_{2}(g) + 4H_{2}O(l)$$
Each $$1g$$ of $$C_{3}H_{8}$$ requires $$3.63\ g$$ of $$O_{2}$$
$$P_{4}(s) + 5O_{2}(g) \rightarrow P_{4}O_{10}(s)$$
Each $$1g$$ of $$P_{4}$$ requires $$1.29\ g$$ of $$O_{2}$$
$$4Fe(s) + 3O_{2}(g) \rightarrow 2FeO_{3}(s)$$
Each $$1\ g$$ of $$Fe$$ requires $$0.428\ g$$ of $$O_{2}$$
$$2Mg(s) + O_{2}(g) \rightarrow 2 MgO(s)$$
Each $$1g$$ of $$Mg$$ requires $$0.66\ g$$ of $$O_{2}$$
therefore least amount of $$O_{2}$$ is required in option (3).

SIMILAR QUESTIONS

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A cold drink bottle contains $$200$$ mL liquid in which $$CO_2$$ is $$0.1$$ molar. Considering $$CO_2$$ as an ideal gas, the volume of the dissolved $$CO_2$$ at S.T.P is:

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Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP. Take the diameter of an oxygen molecule to be $$\displaystyle{{3 \mathring A}}$$.

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What volume of dioxygen is required for complete combustion of 2 volumes of acetylene gas at NTP?

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What volume of water is to be added to $$100\ cm^3$$ of $$0.5\ M\ NaOH$$ solution to make it $$0.1\ M$$ solution?

Mole Concept

What volume of $$5\ M$$ $$Na_2SO_4$$ must be added to $$25\ mL$$ of $$1\ M$$ $$BaCl_2$$ to produce $$10\ g$$ of $$BaSO_4$$?

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If $$1gm$$ of propionic anhydride is introduced quantitatively into water, calculate the volume of $$0.5N$$ alkali required for neutralisation of the solution?

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What is the difference in the molar volume of a gas if S.T.P. conditions are: (i) 1 atm, $$ 0^{\circ}C $$ (ii) 1 bar, $$ 0^{\circ}C $$

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