Assertion and Reason Atoms and Molecules Part 2

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Q (1): Assertion : Ions are always positively charged.

Reason : Ions are formed by losing or gaining of electrons.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (2): Assertion : When 12 g of CaCO3 is decomposed, 4.6 g of residue is left and 4.4 g of CO2 escapes.

Reason : Law of conservation of mass is followed.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (3): Assertion : Pure water obtained from different sources such as river, well, spring, sea etc. always contains hydrogen and oxygen combined in the ratio of 1 : 8 by mass.

Reason : A chemical compound always contains same elements combined in different fixed proportion by mass.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (4): Assertion : Law of conservation of mass holds good for all the reactions.

Reason : It states that energy can neither be created nor destroyed in a chemical reaction.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (5): Assertion : Number of gram-molecules of SO2 Cl2 in 13.5 g of sulphur chloride is 0.1.

Reason : Gram molecular mass is equal to two gram molecule.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (6): Assertion : All noble gases are monoatomic.

Reason : Noble gases are highly stable and unreactive.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (7): Assertion : Atomic mass of aluminium is 14.

Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (8): Assertion : All noble gases are monoatomic.

Reason : Noble gases are highly stable and unreactive.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (9): Assertion: Carbonates are polyatomic ions.

Reason: The carbonate ion consists of one carbon atom and three oxygen atoms and carries an overall charge of.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (10): Assertion: Atoms can neither be sub-divided, created nor destroyed.

Reason: This postulate of Dalton’s theory is the result of law of constant proportion.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (11): Assertion : Law of conservation of mass holds good for all the reactions.

Reason : I states that energy can neither be created nor destroyed in a chemical reaction.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (12): Assertion : Pure water obtained from different sources such as river, well, spring, sea etc. always contains hydrogen and oxygen combined in the ratio of 1 : 8 by mass.

Reason : A chemical compound always contains same elements combined in different fixed proportion by mass.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (13): Assertion : Ions are always positively charged.

Reason : Ions are formed by losing or gaining of electrons.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (14): Assertion : In water, the ratio of mass of hydrogen to the mass of oxygen is always 1:8 whatever the source of water.

Reason : According to law of constant proportion, the elements are always present in definite proportion by mass in a chemical substance.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (15): Assertion : A sodium ion has positive charge.

Reason : Sodium ion has more protons than a neutral atom.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

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