20 Questions MCQ Test Science Class 9 - Test: Laws Of Chemical Combination
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A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?
Detailed Solution for Test: Laws Of Chemical Combination - Question 1
Two laws are followed in this question.
First law is Law of definite proportion as follows:
Here 25 g of reactant A reacts with 50 g of reactant B to produce 50 g of product C. That means 25 g of A consumes only 25 g of B. The ratio is 1:1. Even if there would have been say 75 g B is present, still only 25 g of B will react with 25 g of A. Or if 10 g of B is present then only 10 g of A will react and remaining 15 g of A will remain unreacted.
Second law is Law of conservation of mass as follows :
There is 25 g of A and 50 g of B. That means total 75 g of reactant is present. On product side 50 g of C and 25 g of unreacted B is present. That means total 75 g of product is present. Hence, the correct option will be " Law of conservation of mass and Law of constant proportion ".
Law of conservation of mass can be derived from which postulate of Dalton’s atomic theory?
Detailed Solution for Test: Laws Of Chemical Combination - Question 2
The postulates of Dalton’s Atomic theory that is the result of the law of conservation of mass in the relative numbers and kinds of atoms are constant in a given compound. Atoms cannot be created nor destroyed in a chemical reaction.
According to Law of conservation of mass, mass of reactants wil be equal to the mass of:
Detailed Solution for Test: Laws Of Chemical Combination - Question 4
Law of conversation of mass:in a chemical reaction mass of reactants must be equal to the mass of products because atoms r neither created nor destroyed in a chemical reaction. This was proposed by Antoine lavoisier but experimentally proved by landolt.
Detailed Solution for Test: Laws Of Chemical Combination - Question 11
A molecule of water will always have two hydrogen atoms and one oxygen atom, meaning that in a bottle of pure water the hydrogen to oxygen atom ratio will always be 2:1. This seems very logical to us today. But 300 years ago, scientists didn't understand compounds this way. However, in 1794, Joseph Proust published the Law of Constant Proportions, which says that a chemical molecule will always contains the same elements in the same proportion.
There are two parts to the law of constant proportions: 1) there will always be the same elements that make up a compound, and 2) the mass of these compounds will always be in the same proportion.
Which of the following statement is not in accordance with Dalton’s atomic theory?
Detailed Solution for Test: Laws Of Chemical Combination - Question 12
Dalton’s Atomic Theory was given by John Dalton.
According to this theory: -
(a) Matter is made up of invisible particles known as atoms.
(b) The properties of all the atoms of a given element are the same including mass.
(c) Atoms of different elements combine in fixed ratios to form compounds.
(d) Atoms are neither created nor destroyed.
(e) The formation of new products results from the rearrangements of existing atoms.
(f) Atoms of an element are identical in mass, size and properties.
Which of the following is the major drawback of Dalton’s atomic theory?
Detailed Solution for Test: Laws Of Chemical Combination - Question 13
According to Dalton’s atomic theory, matter is indivisible, i.e., which cannot be divided. But now it is known that under special circumstances, atoms can be divided into still smaller particles called electrons, protons and neutrons. This was the major drawback of Dalton's atomic theory of matter.
Detailed Solution for Test: Laws Of Chemical Combination - Question 15
The balancing of chemical equations is based on the law of conservation of mass.
The law of conservation of mass states that mass can be neither created nor destroyed in a chemical reaction. Total mass of reactants is equal to total mass of products.
Which type of reaction is being used in the experiment of verifying the law of conservation of mass?
Detailed Solution for Test: Laws Of Chemical Combination - Question 17
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.
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