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Class 10  >  Science Class 10  >  Assertion & Reason Test: Acids, Bases & Salts - 1 Download as PDF

Assertion & Reason Test: Acids, Bases & Salts - 1 - Class 10


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15 Questions MCQ Test Science Class 10 - Assertion & Reason Test: Acids, Bases & Salts - 1

Assertion & Reason Test: Acids, Bases & Salts - 1 for Class 10 2023 is part of Science Class 10 preparation. The Assertion & Reason Test: Acids, Bases & Salts - 1 questions and answers have been prepared according to the Class 10 exam syllabus.The Assertion & Reason Test: Acids, Bases & Salts - 1 MCQs are made for Class 10 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Acids, Bases & Salts - 1 below.
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Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 1
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Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: After white washing the walls, a shiny white finish on walls is obtained after two to three days.

Reason: Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish.

Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 1
Calcium hydroxide is obtained by reaction of calcium oxide and water.
Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 2
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Assertion (A): When zinc is added to dilute hydrochloric acid, hydrogen is given off.

Reason (R): Hydrogen chloride molecules contain hydrochloric acid and hydrogen atoms

Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 2

The metal zinc readily reacts with  hydrochloric acid to produce hydrogen ga s (H 2 )  and zinc chloride (ZnCl 2 ).

The reaction is given below:

Zn + 2HCl → ZnCl 2 + H 2



Also,

Hydrochloric acid molecules contain chloride and hydroxide ions .  

 

Thus,

  • Assertion is true
  • Reasoning is true
  • And Reasoning is not the correct explanation of Assertion
Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 3
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Assertion (A): Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.

Reason (R): Carbon dioxide is given off in the reaction.

Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 3
Sodium carbonate reacts with excess hydrochloric acid to form sodium chloride, water and carbon dioxide. In this reaction, bubbles of carbon dioxide are observed.
Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 4
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Assertion (A): Ammonia solution is an alkali.

Reason (R): Ammonia solution turns blue litmus paper red.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 4
Ammonia solution, which is alkaline, turns the red litmus paper blue.
Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 5
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Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): When common salt is kept open, it absorbs moisture from the air.

Reason (R): Common salt contains magnesium chloride.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 5

Assertion (A) is true. When common salt, also known as sodium chloride, is exposed to humid air, it absorbs moisture from the air. This is because the salt molecules are hygroscopic, meaning they have a tendency to absorb water from the air.

Reason (R) is false. Common salt does not contain magnesium chloride. It is a compound of sodium and chlorine, with the chemical formula NaCl.

Therefore, the correct answer is (1) Assertion (A) is true but reason (R) is false.

Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 6
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Assertion (A): Baking soda creates acidity in the stomach.

Reason (R): Baking soda is alkaline.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 6
Baking soda, being alkaline, neutralises the acidity in the stomach and removes it.
Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 7
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Assertion (A): Plaster of Paris is used by doctors for setting fractured bones.

Reason (R): When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 7
Plaster of Paris when mixed with water and applied around the fractured limbs, it sets into a hard mass and keeps the bone joints in a fixed position. So, it is commonly used for setting fractured bones.
Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 8
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Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:

Assertion: While dissolving an acid or base in water, the acids must always be added slowly to water with constant stirring.

Reason: Dissolving an acid on a base in water is a highly exothermic reaction.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 8

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

Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 9
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Assertion : On adding H2SO4 to water the resulting aqueous solution gets corrosive.

Reason: Hydronium ions are responsible for corrosive action.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 9

Because H2SO4 is a strong acid, it readily forms hydronium ions when dissolved in water which are responsible for its corrosive action.

Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 10
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Assertion : Phenolphthalein gives pink colour in basic solution.

Reason : Phenolphthalein is a natural indicator.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 10

Phenolphthalein is often used as an indicator in acid-base titrations. It will appear pink in basic solutions and clear in acidic solutions. Hence, phenolphthalein is chosen because it changes colour in a pH range between 8.3 – 10. But it is not a natural indicator.

Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 11
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Assertion: HCl gas does not change the colour of dry blue litmus paper.

Reason: HCl gas dissolves in the water present in wet litmus paper to from H+ ions.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 11

Both assertion (A) and reason (R) are true, R is not the correct explanation of assertion (A).

Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 12
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Assertion : HCl produces hydronium ions (H3O+) and chloride ions (Cl-) in aqueous solution.

Reason : In presence of water, basic give H+ ions.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 12
Assertion (A) is true but reason (R) is false. HCl produces H+ ions in aqueous solution because in the presence of water, acids give H+ ions. As H+ ions cannot exist alone so it combines with water molecules and forms H3O+.
Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 13
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Assertion: Sodium hydroxide reacts with zinc to produce hydrogen gas.

Reason : Acids react with active metals to produce hydrogen gas.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 13
Sodium hydroxide being a strong base, reacts with active metal (zinc) to produce H2 gas. The reaction is given as follows

Zn (s) + 2NaOH (aq) → Na2ZmO2 (aq)+ H2 (g)

Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 14
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Assertion : Ammonia solution is an alkali.

Reason : Ammonia solution turns blue litmus paper red.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 14

Ammonia gas, which is alkaline, turn the red litmus paper blue.

Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 15
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Assertion : To dilute concentrated sulphuric acid water is added to the acid slowly.

Reason : A lot of heat energy will be given out in the dilution of concentrated sulphuric acid.
Detailed Solution for Assertion & Reason Test: Acids, Bases & Salts - 1 - Question 15

Water is never added to concentrated sulphuric acid as it is an exothermic reaction and releases a large amount of heat energy. It also results in spurting of the acid, which can burn your skin. Concentrated sulphuric acid is added to water in small amounts and that too with constant stirring and cooling.

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