Home
Class 10
CHEMISTRY
Assertion (A) : After white washing the ...

Assertion (A) : After white washing the walls, a shiny white finish on walls is obtained after two to three days.
Reason (R ) : Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish.

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 and R is True.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the given question, we will analyze the assertion and the reason provided, and determine their validity. ### Step 1: Analyze the Assertion The assertion states: "After whitewashing the walls, a shiny white finish on walls is obtained after two to three days." - This statement is **true**. When walls are whitewashed, they do appear shiny and white after the application, and this finish typically becomes more pronounced after a couple of days as the materials settle and dry. ### Step 2: Analyze the Reason The reason states: "Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish." - This statement is **false**. The correct reaction involves Calcium Oxide (CaO) reacting with water (H2O) to form Calcium Hydroxide (Ca(OH)₂), which contributes to the shiny finish. Calcium Oxide does not react with Carbon Dioxide to produce Calcium Hydrogen Carbonate in the context of whitewashing. ### Step 3: Conclusion - Since the assertion is true and the reason is false, we can conclude that the correct answer is that the assertion is true but the reason is false. ### Final Answer The correct option is: **Assertion is true but reason is false.** ---
To solve the given question, we will analyze the assertion and the reason provided, and determine their validity. ### Step 1: Analyze the Assertion The assertion states: "After whitewashing the walls, a shiny white finish on walls is obtained after two to three days." - This statement is **true**. When walls are whitewashed, they do appear shiny and white after the application, and this finish typically becomes more pronounced after a couple of days as the materials settle and dry. ### Step 2: Analyze the Reason The reason states: "Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish." ...
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ACIDS, BASES AND SALTS

    OSWAL PUBLICATION|Exercise CASE-BASED MCQs |42 Videos

  • ACIDS, BASES AND SALTS

    OSWAL PUBLICATION|Exercise Self Assessment - 1 (I. Objective Type Questions) A. Multiple Choice Questions|3 Videos

  • ACIDS, BASES AND SALTS

    OSWAL PUBLICATION|Exercise Board Corner (Long Answer Type Questions)|3 Videos

  • CARBON AND ITS COMPOUNDS

    OSWAL PUBLICATION|Exercise CREATING BASED QUESTIONS|23 Videos

Similar Questions

Explore conceptually related problems

Assertion (A) : Permanent hardness of water is removed by treatment with washing soda. Reason (R): Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.

Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B) ?

Knowledge Check

  • 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.

    A
    Both A and R are true, and R is correct explanation of the assertion.
    B
    Both A and R are true, but R is not the correct explanation of the assertion.
    C
    A is true, but R is false.
    D
    A is false, but R is true.

  • Assertion (A): Calcium and magnesium oxides are not reduced by carbon. Reason (R ): Calcium and magnesium oxides react with carbon to form their respected carbides.

    A
    If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`.
    B
    If both `(A)` and `(R )` are correct, but `(R )` is not the correct explanation of `(A)`.
    C
    If `(A)` is correct, but `(R )` is incorrect.
    D
    If `(A)` is incrrect, but `(R )` is correct.

  • Assertion . Calcium and magnesium oxides are not reduced by carbon . Reason . Calcium and magnesium oxides react with carbon to form their respective carbides .

    A
    If both assertion and reason are true, and reason is the true explanation of the assertion.
    B
    If both assertion and reason are true, but reason is not the true explanation of the assertion.
    C
    If assertion is true, but reason is false
    D
    If both assertion and reason are false.

    • Similar Questions

    Explore conceptually related problems

    Assertion : All alkali metals do not form superoxides as one of the main products in excess of air on heating. Reason : Superoxide reacts with carbon monoxide producing a white powder and liberating dioxygen.

    Assertion (A) : Calcium hydroxide reacts slowly with the CO_(2) in air to form a thin layer of CaCO_(3) on the walls. Reason (R) : Decomposition reactions require energy in the form of heat, light or electricity for breaking down the reactants.

    Assertion: Permanent hardness of water can be removed by treatement with washing soda. Reason: Washing soda reacts with calcium and magnesium sulphates and chlorides to form insoluble carbonates.

    This section contains Assertion and Reason type question. Each question has 4 choices (1), (2), (3) and (4), out of which only one is correct. Assertion (A) Hard water does not give lather with soap. Reason (R) Hard water contains calcium and magnesium salt in the form of hydrogen carbonate, chloride and sulphate.

    Assertion : Permanent hardness of water can be removed by using washing soda. Reason : Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates.

    Home
    Profile