Engineer & Medical

Some Basic Concepts of Ch question bank (Chemistry)

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Q1.

An oxide of iron contains $69.9\%$ iron, its empirical formula, is: (Given: Molar mass of Fe and O are $56$ and $16$ g mol$^{-1}$ respectively.)

(A)

$\text{FeO}$

(B)

$\text{Fe}_2\text{O}_3$

(C)

$\text{Fe}_3\text{O}_4$

(D)

$\text{FeO}_3$

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Q2.

Number of moles and number of molecules in $1.4187$ L of $SO_2$ at STP respectively are:

(A)

$0.1266; 3.812 \times 10^{22}$

(B)

$0.0633; 3.812 \times 10^{22}$

(C)

$0.1266; 7.6238 \times 10^{22}$

(D)

$0.0633; 7.6238 \times 10^{22}$

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