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Acids Bases And Salts Test - 6

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Acids Bases And Salts Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which one of the following is not a bleaching agent?
    Solution
    Chlorine, sulphur dioxide and sodium hypochlorite can be used as bleaching agents, but carbon dioxide cannot be used as a bleaching agent.
  • Question 2
    1 / -0
    Gypsum is
    Solution
    Gypsum is a soft sulphate mineral composed of calcium sulphate dihydrate. It has chemical formula CaSO4•2H2O.
  • Question 3
    1 / -0
    An aqueous solution of a sodium salt was electrolysed by using graphite electrodes in an electrolytic cell. A gas 'X' was evolved at the anode. When 'X' was allowed to mix with hydrogen sulphide gas contained in a jar, a yellow coloured solid was deposited on the walls of the gas jar. Which one of the following gases is 'X'?
    Solution
    Electrolysis of aqueous NaCl results in the formation of hydrogen gas at the cathode and chlorine gas at the anode.
    At the anode, chloride (Cl−) is oxidised to chlorine gas (X).
    The reaction at the anode is:
    2Cl−(g) → Cl2(g) + 2e−
    At the cathode, water is reduced to hydroxide and hydrogen gas.
    The reaction at the cathode is:
    2H2O(l) + 2e− → H2(g) + 2OH−
    When a gas jar of hydrogen sulphide is inverted over a gas jar of chlorine (X), a yellow precipitate of sulphur and hydrogen chloride gas will be formed.
    H2S(g) + Cl2(g) → 2HCl(g) + S(s)
  • Question 4
    1 / -0
    Permanent hardness of water can be removed by adding
    Solution
    Calcium and magnesium ions present in hard water react with sodium carbonate to produce soluble and harmless sodium salts.
  • Question 5
    1 / -0
    Sodium bicarbonate is also known as
    Solution
    Sodium bicarbonate (sodium hydrogen carbonate) is a chemical compound with formula NaHCO3. It is a salt composed of sodium ions and bicarbonate ions. It is also known as baking soda.
  • Question 6
    1 / -0
    Which of the following is not a salt?
    Solution
    H3PO4 is not a salt, it is an acid. It has three acidic protons (attached to oxygen) and is therefore tribasic. Its salts are called phosphates.
  • Question 7
    1 / -0
    Which of the following is used for disinfecting drinking water?
    Solution
    Bleaching powder is a chemical compound with formula CaClO2 (Calcium hypochlorite). It is widely used for water treatment. It is used for disinfection of water in the treatment process.
    It is a mixture of two salts present in fixed proportions are CaCl2 and Ca(OCl)2,both of which share a common cation ie Ca2+.
    Thus bleaching powder is Ca(OCl)Cl or CaOCl2.
    H2O + CaOCl2 Ca(OH)2 + Cl2
    The chlorine released by the bleaching powder kills pathogens (disease causing bacteria).
  • Question 8
    1 / -0
    Which of the following is not a use of sodium hydrogen carbonate?
    Solution
    Sodium hydrogen carbonate is not used in glass industry. Glass production is the most common use of sodium carbonate.
  • Question 9
    1 / -0
    Which of the following salts is used as a plaster for supporting fractured bones?
    Solution
    Calcium hemihydrate, commonly called plaster of Paris, is used as a plaster for supporting fractured bones.
    A paste of the salt on cooling sets into a hard mass.
    The chemical formula of the salt is CaSO4.H2O.
  • Question 10
    1 / -0
    Which of the following salts is insoluble in water?
    Solution
    Calcium sulphate usually does not react with water. It results in a hydrated salt. Its solubility is also very less in water.
  • Question 11
    1 / -0
    Potassium ferrocyanide is a
    Solution
    A complex compound is a compound formed from a Lewis acid and a Lewis base. They do not dissociate into its constituent ions in solutions.
    e.g. Fe(CN)2 + 4KCN ---> K4[Fe(CN)6]
    K4[Fe(CN)6] on dissociation gives 4K+ + [Fe(CN)6]4-.
  • Question 12
    1 / -0
    Which among the following is not an alkali?
    Solution
    An alkali is a water-soluble base. As Cu(OH)2 is not soluble in water, it is not an alkali.
  • Question 13
    1 / -0
    Which of the following acts as a Bronsted acid but not a Lewis acid?
    Solution
    can donate a proton and act as a Bronsted acid.
    However, it does not have empty orbitals to accommodate electrons, and is not a Lewis acid.
  • Question 14
    1 / -0
    Which of the following solutions can cause a strip of onion to lose its odour?
    Solution
    Onion has a characteristic smell and is used as an olfactory indicator. When a basic solution like sodium hydroxide solution is added to a cloth strip treated with onions, the odour cannot be detected. However, the odour is retained with acidic solutions.
    Hence, option (2) is correct.
  • Question 15
    1 / -0
    Which of the following acids is present in ant sting?
    Solution
    Methanoic acid (also called formic acid) is the simplest carboxylic acid. The chemical formula is HCOOH. It is an important intermediate in chemical synthesis and occurs naturally, most notably in some ants.
  • Question 16
    1 / -0
    Which of the following is a dibasic acid?
    Solution
    A dibasic acid is an acid that has two hydrogen ions to donate to a base in an acid-base reaction. Therefore, a dibasic molecule has two replaceable hydrogen atoms. Sulphuric acid (H2SO4) is a dibasic acid.
  • Question 17
    1 / -0
    Which of the following is a triacidic base?
    Solution
    Aluminium hydroxide is a triacidic base because it will give three OH- ions.
  • Question 18
    1 / -0
    Which of the following indicators shows colour changes in the entire pH range?
    Solution
    Universal indicator is formed by mixing different indicators and shows a colour change in the entire pH range.
    Hence, it is used to compare the relative strength of acids and bases.
  • Question 19
    1 / -0
    Which of the following gases is evolved when metal hydrogen carbonate reacts with an acid?
    Solution
    When a metal hydrogen carbonate reacts with an acid, carbon dioxide gas is evolved along with the formation of a salt.
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