Tag: law of constant proportion

Questions Related to law of constant proportion

A solution of copper oxide was prepared by heating, igniting and precipitation. Which of the following method will give higher ratio of copper oxide?

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  1. Heating

  2. Precipitation

  3. Ignition

  4. All of the above will give the same ratio

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Correct Option: D
Explanation:

In a compound the ratio of the atoms or element by mass remains always same irrespective of the source of compound. This means a certain compound always formed by the combination of atoms in same ratio by mass. Hence, copper oxide made from any method will always give the same ratio of copper oxide.

In a compound the ratio of the atoms or element by mass remains always same irrespective of :

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  1. temperature

  2. nature of compound

  3. source of compound

  4. size of compound

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Correct Option: C
Explanation:

Compounds are formed by the combination of two or more elements. In a compound the ratio of the atoms or element by mass remains always same irrespective of the source of compound. This means a certain compound always formed by the combination of atoms in same ratio by mass. If the ratio of mass of constituent atoms will be altered the new compound is formed.

If the ratio of the atoms by mass is altered then :

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  1. new compound formed

  2. same compound are formed

  3. no reaction takes place

  4. state of compound are changed

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Correct Option: A
Explanation:

In a compound the ratio of the atoms or element by mass remains always same irrespective of the source of compound. This means a certain compound always formed by the combination of atoms in same ratio by mass. If the ratio of mass of constituent atoms will be altered the new compound is formed.

Law of constant proportion states that :

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  1. a chemical compound always contains exactly the same proportion of elements by mass.

  2. mass can neither be created nor destroyed in a chemical reaction.

  3. when two elements combine with each other to form two or more than two compounds, the masses of one the element which combines with the fixed mass of the other, bears a simple whole number ratio.

  4. total mass of products is always equal to the total mass of reactants.

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Correct Option: A
Explanation:

Law of Constant Proportion states that a chemical compound always contains exactly the same proportion of elements by mass. This law is also known as Law of definite proportions. Joseph Louis Proust gave this law hence, this law is also known as Prousts Law.

Hydrogen combines with oxygen to form water. Water exists in:

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  1. liquid

  2. solid

  3. gas

  4. plasma

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Correct Option: A,B,C
Explanation:

Hydrogen combines with oxygen to form water. Water exists in solid ( ice), liquid ( water) and gas ( water vapor).

Four different experiments were conducted in the following ways-

I) $3g$ of carbon was burnt in $8g$ of oxygen to give $11g$ of $CO _2$

II) $1.2g$ of carbon was burnt in air to give $4.2g$ of $CO _2$,

III) $4.5g$ of carbon was burnt in enough air to give $11g$ of $CO _2$

IV) $4g$ of carbon was burnt in oxygen to form $30.3g$ of $CO _2$


Law of constant proportions is illustrated in which of the following experiment(s)?

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  1. I and III only

  2. II and III only

  3. IV only

  4. I only

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Correct Option: D

Hydrogen combines with oxygen to form $H _2O$ in which 16 g of oxygen combine with 2 g of hydrogen. Hydrogen also combines with carbon to form $CH _4$ in which 2 g of hydrogen combine with 6 g of carbon.If carbon and oxygen combine together then they will do show in the ratio of 

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  1. 13 : 32

  2. 6 : 16

  3. 1 : 2

  4. 12 : 24

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Correct Option: B

Two gases found dissolved in natural water are 

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  1. oxygen and carbon dioxide

  2. hydrogen and oxygen

  3. sulphur dioxide and hydrogen

  4. chlorine and ammonia

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Correct Option: A

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

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  1. Law of constant composition

  2. Law of conservation of mass

  3. Law of reciprocal proporties

  4. Law of multiple proportions

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Correct Option: A

In Haber's process, the volume of ammonia relative to the total volume of reactants at STP is:

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  1. one fourth

  2. one half

  3. same

  4. three fourth

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Correct Option: B
Explanation:

This reaction occurs in Haber's process-


$N _2$ + $3H _2$ $\rightarrow$ $2NH _3$

The total volume of reactants at STP is 4x

The volume of ammonia is 2x.

Hence, Volume of ammonia = $\dfrac{1}{2}$(Volume of reactant)