Question
For question two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
  1. Both A and R are true, and R is correct explanation of the assertion.
  2. Both A and R are true, but R is not the correct explanation of the assertion.
  3. A is true, but R is false.
  4. A is false, but R is true.
Assertion: Acetic acid does not act as an acid in benzene solution.
Reason: Benzene is non-polar.

Answer

  1. Both A and R are true, and R is correct explanation of the assertion.

Explanation:

For ionization of an acid or base, polar solvents (like water) are required. As ionization does not take place in non-polar solvents (like benzene) so acetic acid does not act as an acid.

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For two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
  1. Both A and R are true, and R is correct explanation of the assertion.
  2. Both A and R are true, but R is not the correct explanation of the assertion.
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  4. A is false, but R is true.
Assertion: Metals generally act as reducing agents.
Reason: The reducing character is expressed in terms of electron releasing tendency.
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Assertion: pH of ammonium nitrate solution is acidic.
Reason: Solution of a salt of weak base and strong acid is acidic.
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Assertion: Gold occurs in native state.
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Assertion: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.
Reason: The decomposition reaction takes place on application of heat, therefore, it is an endothermic reaction.
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  2. Both A and R are true, but R is not the correct explanation of the assertion.
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Assertion: Diamond is the hardest natural known substance.

Reason: Diamond is used for cutting marble, granite and glass.
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Assertion: Chemical reaction changes the physical and chemical state of a substance.
Reason: When electric current is passed through water (liquid), it decomposes to produce hydrogen and oxygen gases.
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Assertion: Bleaching powder reacts with dilute acids to evolve chlorine.
Reason: The chlorine liberated by the action of dilute acids on bleaching powder is called available chlorine.
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Assertion: Electrovalency of Na is+ 1.
Reason: The number of electrons which an atom either loses or gains in the formation of an ionic bond is known as its valency.
For question two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
  1. Both A and R are true, and R is correct explanation of the assertion.
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Assertion: The chemical name of bleaching powder is calcium oxychloride.
Reason: Bleaching powder is used as an oxidising agent in chemical industries.
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Assertion: The reaction during which hydrogen is lost is called oxidation reaction.
Reason: Reducing agent removes hydrogen from another substance.