Question
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.
  3. A is true, but R is false.
  4. A is false, but R is true.
Assertion: The property of beating a metal into sheets is called ductility.
Reason: Gold and silver are most malleable metals.

Answer

  1. A is false, but R is true.

Explanation:

The property of beating a metal into sheets is called malleability.

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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.
  3. A is true, but R is false.
  4. A is false, but R is true.
Assertion: Magnesium wire bums in presence of O2.
Reason: Magnesium acts as a reducing agent.
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Assertion: Baking soda is prepared by chlor-alkali process.
Reason: Brine decomposes to sodium hydroxide on passing electricity through it.
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Assertion: Following reaction describes the rusting of iron and is a redox reaction.
4Fe + 3O2 → 4Fe3+ + 602-.
Reason: The metallic iron is oxidised to Fe3+.
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:
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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: Sodium carbonate pentahydrate is also known as washing soda.
Reason: Chief raw materials for the manufacture of washing soda are NH3, NaCl and CaCO3.
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  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: Tooth decay starts when the pH of the mouth is lower than 5.5.
Reason: Enamel starts corroding below 5.5 pH.
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:
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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: Saturated hydrocarbons are chemically less reactive.

Reason: All the valencies of carbon atom are satisfied by single covalent bonds. 
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  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.
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Assertion: The food items containing oil and fat are flushed with nitrogen.
Reason: Oil and fat become rancid on oxidation which has the bad taste and smell.
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Assertion: Iron articles are painted so as to prevent them from rusting.
Reason: When the surface of iron is coated with paint, its surface does not come in contact with oxygen and moisture therefore rusting does not take place.
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Assertion: Diamond and graphite do not have the same crystal structure.

Reason: Diamond is crystalline while graphite is amorphous.
Assertion (A): Tap water conducts electricity but distill water does not conducts electricity.
Reason (R): Tap water conducts electricity as it contains ions whereas distilled water does not contain ions.