Laws of Definite Proportions, Multiple Proportions

Q. The law of multiple proportions is illustrated by the pair of compounds:

1. $Mg(OH{)}_2$ and $MgO$
2. Water and heavy water
3. $S{O}_2$ and $S{O}_3$
4. $NaCl$ and $NaBr$

Q. Sodium and oxygen combine to form two compounds, one being $N{a}_{2}O$. The amount of sodium in the other compound is 59% by weight. Find the formula of this compound.

1. $Na{O}_2$
2. $N{a}_2{O}_2$
3. $NaO$
4. $N{a}_{2}O$

Q. A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.73% oxygen. The data supports:

1. Gay-Lussac's law
2. Law of conservation of mass
3. Law of multiple proportions
4. Law of definite proportions

Q. The law of multiple proportions is illustrated by the pair of compounds:

1. $Mg(OH{)}_2$ and $MgO$
2. Water and heavy water
3. $NaCl$ and $NaBr$
4. $S{O}_2$ and $S{O}_3$

Q. $KCl$ contains $52\%$ of potassium, $KI$ contains $23.6\%$ of potassium, and $ICl$ contans $77.8\%$ of iodine. What will be the ratio of K and I in $KI$?

1. 1:2
2. 2:1
3. None of the above
4. 1:1

Q. Sodium and oxygen combine to form two compounds, one being $N{a}_{2}O$. The amount of sodium in the other compound is 59% by weight. Find the formula of this compound.

1. $Na{O}_2$
2. $N{a}_2{O}_2$
3. $NaO$
4. $N{a}_{2}O$

Q. Consider two compounds of A and B. In one compound, x grams of A combines with y grams of B whereas 2x grams of A combines with 3y grams of B in the second one. The data satisfies:

1. Law of multiple proportions
2. Law of conservation of mass
3. Law of constant proportions
4. Law of reciprocal proportions

Q. Pure samples of water always yield $88.89\%$ of oxygen and $11.11\%$ of hydrogen, by mass. This can be explained by using the law of:

1. Conservation of mass
2. Constant proportions
3. Multiple proportions
4. Reciprocal proportions

Q.

5.0 g of a certain element X forms 10.0g of its oxide having the formula $X_4{O}_6$. The atomic mass of X is ?

1. 30.0 amu

2. 32.0 amu

3. 12.0 amu

4. 24.0 amu

Q. Two oxides of a metal contain $27.6\%and30.0\%$ of oxygen, respectively. If the formula of the first is $M_3$$O_4$, the second oxide is.

1. $M_3$$O_5$
2. $M_3$$O_3$
3. $M_3$$O_2$
   
4. $M_2$$O_3$

Q. In a compound A, $1.00\text{g}$ of nitrogen combines with $0.57\text{g}$ of oxygen. In a compound B, $2.00\text{g}$ of nitrogen combines with $2.24\text{g}$ of oxygen. In a compound C, $3.00\text{g}$ of nitrogen combines with $5.11\text{g}$ of oxygen. These data shows which of the following laws?

1. Law of constant proportions
2. Law of multiple proportions
3. Law of reciprocal proportions
4. Dalton’s law of partial pressure

Q. A sample of calcium carbonate $\left(CaC{O}_3\right)$ has the following percentage composition $Ca=40\%;C=12\%;O=48\%$
If the law of constant proportions is true, then the weight of calcium in $4\text{g}$ of a sample of calcium carbonate from another source will be

1. $0.016\text{g}$
2. $0.16\text{g}$
3. $1.6\text{g}$
4. $16\text{g}$

Q. $KCl$ contains $52\%$ of potassium, $KI$ contains $23.6\%$ of potassium, and $ICl$ contans $77.8\%$ of iodine. What will be the ratio of K and I in $KI$?

1. 1:2
2. 1:1
3. 2:1
4. None of the above

Q.

5.0 g of a certain element X forms 10.0g of its oxide having the formula $X_4{O}_6$. The atomic mass of X is ?

1. 12.0 amu

2. 24.0 amu

3. 30.0 amu

4. 32.0 amu

Q. The law of multiple proportion was proposed by :

1. Lavoisier
2. Dalton
   
3. Proust
   
4. Gay-Lussac

Q. Suppose the elements $X$ and $Y$ combine to form two compunds $X{Y}_2$ and $X_3{Y}_2$. when $0.1$ mole of $X{Y}_2$ weighs $10g$ and $0.05mole$ of $X_3{Y}_2$ weighs $9g$, the atomic weights of $X$ and $Y$ are

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1. 20, 30
2. 60 , 40
3. 30, 20
4. 40 , 30

Q. Two different oxides of a metal contain 20% and 27% oxygen by weight. This is in accordance with the law of:

1. Conservation of mass
2. Constant composition
3. Multiple proportions
4. Reciprocal proportions

Q.

Zinc sulphate contains $22.65\%$ of zinc and $43.9\%$ of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be

1. 45.3 g
2. 4.53 g
3. 0.453 g
4. 453 g

Q. Two elements A and B combine to form compounds X and Y. For a fixed mass of A, the masses of B that combine to form the compounds X and Y are in the ratio $3:7$. If in the compound X, $4\text{g}$ of A combines with $12\text{g}$ of B, then in compound Y, $8\text{g}$ of A will combine with _______ $\text{g}$ of B.

1. $24$
2. $56$
3. $28$
4. $8$