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Chemistry Test 223

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Chemistry Test 223
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Phenyl diazonium salts form azo dye with

    (1) Aniline

    (2) Phenol

    (3) N, N–dimethylaniline

    (4) Anisole (methoxybenzene)

    Of these statements :

    Solution

    PhN+ ≡ N is a weak electrophile that undergoes diazocoupling only with rings activated by −OH,−NH2,−NHR or−NR2. The ring is not sufficiently activated by -OCH3 and hence, anisole does not form azodye.

     

  • Question 2
    4 / -1

    Low spin complex is formed by

    Solution

    Low spin complex utilises (n−1) d-orbital for hybridisation and thus the low spin complex is formed with d2sp3 hybridisation. Inner d-orbital complex is formed.

     

  • Question 3
    4 / -1

    Which of the following hybridization pattern best describes the carbon atom in NCO− ?

    Solution

    NCO. is isoelectronic with CO2, which has a linear geometry in which C−atom is sp-hybridized.

     

  • Question 4
    4 / -1

    The bond dissociation enthalpy of E−H (E = element) bonds is given below. Which of the compounds will act as the strongest reducing agent?

    Solution

    Reducing agents are those which reduce others and oxidise itself.

    Hydrides reduce others by providing hydrogen. So, lesser the bond dissociation energy of the E−H bond, (where E is the element combined with hydrogen) the easier it will be to reduce others. Thus, among the given hydrides, SbH3 will act as the strongest reducing agent.

     

  • Question 5
    4 / -1

    A compound contains atoms X, Y, Z. The oxidation number of X is +2, Y is +5, and Z is −2. The possible formula of the compound is -

    Solution

    Sum of oxidation number of atoms in it is zero.

    For X3(YZ4)2,

    Oxidation number of 3(X) + 2[Oxidation number of Y + 4(Oxidation number of Z)] = 0

    3(+2) + 2[(+5) + 4(−2)] = 0

    ⇒ +6 + 10 − 16 = 0

    ⇒ 0 = 0

     

  • Question 6
    4 / -1

    A depolarizer used in dry cell batteries is

    Solution

    Depolarizer is a substance, which is used in primary cells to prevent a build-up of hydrogen gas bubble.

    A battery depolarizer absorbs electrons during discharge of a cell, so it acts as an oxidising agent.

    In dry cells, manganese dioxide act as a depolariser.

     

  • Question 7
    4 / -1

    Which of the following is the correct order of thermal stability of hydrides?

    Solution

    Thermal stability is the stability of the molecule towards heat. Thermal stability of hydrides decreases down the group, as on going down the group, the size of the element E (side element with hydrogen) increases. So, the E−H bond length increases, hence- bond strength becomes weak and breaks easily to liberate hydrogen gas.

    Thus, the order of thermal stability of hydrides is NH3 > PH3 > AsH3 > SbH3 > BiH3

     

  • Question 8
    4 / -1

    Which undergoes catalytic hydrogenation much faster?

    Solution

    he reagent metal/Hydrogen is used in the catalytic hydrogenation. It is a syn addition to the pi-bond.

    Hence, the reactivity depends on the steric hindrance of the groups present in the molecule.

     

  • Question 9
    4 / -1

    The temporary hardness of water due to calcium bicarbonate and can be removed by adding

    Solution

    Lime treatment removes bicarbonate hardness by forming insoluble CaCO3 as,

     

  • Question 10
    4 / -1

    KO2 is used in space and submarines because it,

    Solution

    KO2 absorbs CO2 and increases O2 concentration, so it is used in space and submarines.

     

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