03. Laws of Chemical Combinations
Some Basic Concepts of Chemistry

228761 An organic compound contains $78 \%$ (by wt) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is [Atomic wt. of $C$ is 12, $h$ is 1]

1 $\mathrm{CH}_4$
2 $\mathrm{CH}$
3 $\mathrm{CH}_2$
4 $\mathrm{CH}_3$
Some Basic Concepts of Chemistry

228763 In Kjeldahl's method, ammonia from $5 \mathrm{~g}$ of food neutralizes $30 \mathrm{~cm}^3$ of $0.1 \mathrm{~N}$ acid. The percentage of nitrogen in the food is

1 0.84
2 8.4
3 16.8
4 1.68
Some Basic Concepts of Chemistry

228764 If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water. What will be the content of oxygen in the substance?

1 73.29
2 $78.45 \%$
3 $83.23 \%$
4 $89.50 \%$
Some Basic Concepts of Chemistry

228765 On electrolysis of aqueous solution of a halide of a metal ' $M$ ' by passing 1.5 ampere current for 10 minutes deposits $0.2938 \mathrm{~g}$ of metal. If the atomic mass of the metal is $63 \mathrm{gm} / \mathrm{mole}$, then what will be the formula of the metal halide?

1 $\mathrm{MCl}_2$
2 $\mathrm{MCl}_3$
3 $\mathrm{MCl}$
4 $\mathrm{MCl}_4$
Some Basic Concepts of Chemistry

228761 An organic compound contains $78 \%$ (by wt) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is [Atomic wt. of $C$ is 12, $h$ is 1]

1 $\mathrm{CH}_4$
2 $\mathrm{CH}$
3 $\mathrm{CH}_2$
4 $\mathrm{CH}_3$
Some Basic Concepts of Chemistry

228763 In Kjeldahl's method, ammonia from $5 \mathrm{~g}$ of food neutralizes $30 \mathrm{~cm}^3$ of $0.1 \mathrm{~N}$ acid. The percentage of nitrogen in the food is

1 0.84
2 8.4
3 16.8
4 1.68
Some Basic Concepts of Chemistry

228764 If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water. What will be the content of oxygen in the substance?

1 73.29
2 $78.45 \%$
3 $83.23 \%$
4 $89.50 \%$
Some Basic Concepts of Chemistry

228765 On electrolysis of aqueous solution of a halide of a metal ' $M$ ' by passing 1.5 ampere current for 10 minutes deposits $0.2938 \mathrm{~g}$ of metal. If the atomic mass of the metal is $63 \mathrm{gm} / \mathrm{mole}$, then what will be the formula of the metal halide?

1 $\mathrm{MCl}_2$
2 $\mathrm{MCl}_3$
3 $\mathrm{MCl}$
4 $\mathrm{MCl}_4$
Some Basic Concepts of Chemistry

228761 An organic compound contains $78 \%$ (by wt) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is [Atomic wt. of $C$ is 12, $h$ is 1]

1 $\mathrm{CH}_4$
2 $\mathrm{CH}$
3 $\mathrm{CH}_2$
4 $\mathrm{CH}_3$
Some Basic Concepts of Chemistry

228763 In Kjeldahl's method, ammonia from $5 \mathrm{~g}$ of food neutralizes $30 \mathrm{~cm}^3$ of $0.1 \mathrm{~N}$ acid. The percentage of nitrogen in the food is

1 0.84
2 8.4
3 16.8
4 1.68
Some Basic Concepts of Chemistry

228764 If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water. What will be the content of oxygen in the substance?

1 73.29
2 $78.45 \%$
3 $83.23 \%$
4 $89.50 \%$
Some Basic Concepts of Chemistry

228765 On electrolysis of aqueous solution of a halide of a metal ' $M$ ' by passing 1.5 ampere current for 10 minutes deposits $0.2938 \mathrm{~g}$ of metal. If the atomic mass of the metal is $63 \mathrm{gm} / \mathrm{mole}$, then what will be the formula of the metal halide?

1 $\mathrm{MCl}_2$
2 $\mathrm{MCl}_3$
3 $\mathrm{MCl}$
4 $\mathrm{MCl}_4$
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Some Basic Concepts of Chemistry

228761 An organic compound contains $78 \%$ (by wt) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is [Atomic wt. of $C$ is 12, $h$ is 1]

1 $\mathrm{CH}_4$
2 $\mathrm{CH}$
3 $\mathrm{CH}_2$
4 $\mathrm{CH}_3$
Some Basic Concepts of Chemistry

228763 In Kjeldahl's method, ammonia from $5 \mathrm{~g}$ of food neutralizes $30 \mathrm{~cm}^3$ of $0.1 \mathrm{~N}$ acid. The percentage of nitrogen in the food is

1 0.84
2 8.4
3 16.8
4 1.68
Some Basic Concepts of Chemistry

228764 If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water. What will be the content of oxygen in the substance?

1 73.29
2 $78.45 \%$
3 $83.23 \%$
4 $89.50 \%$
Some Basic Concepts of Chemistry

228765 On electrolysis of aqueous solution of a halide of a metal ' $M$ ' by passing 1.5 ampere current for 10 minutes deposits $0.2938 \mathrm{~g}$ of metal. If the atomic mass of the metal is $63 \mathrm{gm} / \mathrm{mole}$, then what will be the formula of the metal halide?

1 $\mathrm{MCl}_2$
2 $\mathrm{MCl}_3$
3 $\mathrm{MCl}$
4 $\mathrm{MCl}_4$