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Acids Bases and Salts Test - 11

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Acids Bases and Salts Test - 11
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  • Question 1
    1 / -0

    Ayush and Ishoo were given one test tube each. One of the test tube contained water and the other contained a solution of sodium hydroxide. They were asked to identify the test tube containing NaOH solution. Which one of the following can be used for correctly identifying the required test tube?

    Solution

    A base (NaOH) turns red litmus blue but a netrul compund (water) does not show any colour change.

  • Question 2
    1 / -0

    When HCl reacts with granulated zinc

    Solution

    Acids (HCl) reat with metals (Zn) to form salt and release hydrogen gas. The hydrogen gas evolved appears as bubbles.

  • Question 3
    1 / -0

    Zinc metal is amphoteric in nature because

    Solution

    A substance that can react with both acids and bases is called an amphoteric substance.

  • Question 4
    1 / -0

    On passing CO2 through lime water for a longer time, why does the milkiness disappear?

    Solution

    When carbon dioxide gas is passed through lime water, it turns milky due to the formation of calcium carbonate which is insoluble in water.
    Ca(OH)2 + CO2 → CaCO3 + H2O
    However, when excess of carbon dioxide is passed through this solution, the milkyness disappears. This is due the formation of calcium bicarbonate, which is soluble in water. Thus, a clear solution is obtained.
    CaCO3 + H2O + CO2 →Ca(HCO3)2

  • Question 5
    1 / -0

    When a few drops of phenolphthalein are added to a solution of NaOH pink colour is produced. What will be the colour of the final mixture when excess of HCl is added to it?

    Solution

    Phenolphthalein remains colourless in acidic solution and forms a pink colour in presence of base.

  • Question 6
    1 / -0

    A solution reacts with crushed egg shells to give a gas that turns lime water milky. The solution contains

    Solution

    Egg shells contains calcium carbonate. On reaction with HCl they liberate CO2 gas which turns lime water to milky according to the following equation:
    CaCO3 + 2HCl → CaCl2 + H2O + CO2

  • Question 7
    1 / -0

    Honey bee sting contains

    Solution

    Formic acid, also known as methanoic acid, in the bee sting causes itching in the skin..

  • Question 8
    1 / -0

    Curd and other sour substances should not be kept in metallic containers because

    Solution

    The sour substances are acidic in nature. Acids react with metals to form salts which can be toxic when eaten.

  • Question 9
    1 / -0

    What is an alkali?

    Solution

    An alkali is a basic hydroxide or ionic salt of an alkali metal or alkaline earth metal element, which is soluble in water. Only few alkalis are known, examples, sodium hydroxide (NaOH), potassium hydroxide (KOH), calcium hydroxide (Ca(OH)2), calcium carbonate (CaCO3), and magnesium hydroxide (Mg(OH)2.

  • Question 10
    1 / -0

    Electrolysis of brine solution produces chlorine gas and hydrogen at

    Solution

    On electrolysis, brine (sodium chloride solution) produces hydrogen gas at the cathode and chlorine gas at the anode.
    The half-equations for the reactions are:
    At the cathode: 2 H+(aq) + 2 e−  → H2(g)
    At the anode: 2 Cl−(aq);→ Cl2(g) +  2 e−
    Overall process: 2 NaCl (or KCl) + 2 H2O → Cl2 + H2 + 2 NaOH (or KOH)
    The solution left provides sodium hydroxide (a strong alkali). 

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