Assertion (A) : Air is compound substance.
Reason (R) : We can separate air into two or more components only by means of a chemical reaction.
A) A and R are true
B) A and R are false
C) A is true but R is false
D) A is false but R is true
1 Answers
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10. Lymph differs from blood in possessing (1) More proteins and less waste products (2) Less proteins and more waste products (3) More proteins and more waste products (4) Less proteins and less waste products
(2) Less proteins and more waste products
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……………. defined an element as any substance that cannot be decomposed into further simple substance by physical or chemical change.
B) Robert Boyle
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Substances which can be separated into two or more components by chemical reactions are called as ……………….
C) compounds
2 Answers 1 views
Ink is a mixture of a dye in water. We can separate the components in the ink using evaporation. The correct observation in the experiment is
Correct option is (A) i and ii Ink is a mixture of dye in water. We can separate the components in the ink. Using evaporation water in ink is evaporated thus...
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Ink is a mixture of a dye in water. We can separate the components in the ink using evaporation. The correct observation in the experiment is
2 Answers
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Ink is a mixture of a dye in water. We can separate the components in the ink using evaporation. The correct observation in the experiment is
2 Answers
1 views
When the particles of a substance contain only one type of atoms, that substance is called a / an
Correct option is B) element
2 Answers 1 views
Uma : Mass is neither created nor destroyed during a chemical reaction. Rama : Matter is conserved in a chemical reaction.
A) Uma is correct, Rama is incorrect.
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Assertion (A) : All the chemical equations must be balanced. Reason (R) : Atoms are either created or destroyed in chemical reaction.
C) ‘A’ is correct, but ‘R’ is incorrect.
2 Answers 2 views
Assertion : Chemical messenger gives message to the cell without entering the cell. Reason: Chemical messenger is received at the binding site of rece
Correct Answer - B Reason is the correct explanation of the assertion.
2 Answers 1 views