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Chemistry Test - 4

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Chemistry Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0.25

    The volume of 1 mole of any pure gas at standard temperature and pressure is always equal to

    Solution

    The volume of 1 mole of any pure gas at standard and pressure (STP) is equal to 22.414 L

    1 L = 10-3 m3

    ∴ 22.4 L = 0.022414 m3

  • Question 2
    1 / -0.25

    Which of the following is also called as nitrogen sesquioxide?

    Solution

    Nitrogen sesquioxide is an oxide containing three atoms of oxygen with two atoms of nitrogen element. Its chemical formula is N3 O3 .

  • Question 3
    1 / -0.25

    Which among the following is a set of nucleophiles?

    Solution

    Key Idea: Nucleophile is a chemical species that can donate an electron pair to form a chemical bond in relation to a reaction.

    All molecules or ions with free pair of electrons or at least one rt-bood can act as nucleophiles.

    Among given species CN- , H2 O, R—OH are nucleophiles.

  • Question 4
    1 / -0.25

    In ozone molecule the formal charge on the central oxygen atom is

    Solution

    Key Idea: The formal charge can be calculated using a formula.

    Formal charge = number of valence electron electrons

    (number of electrons in bond pairs) - number of electrons in the lone pair.

    For O3 .

  • Question 5
    1 / -0.25

    How many total constituent particles are present in a simple cubic unit cell?

    Solution

    A simple cubic lattice has only eight atoms on the comers. As the contribution by each = 1/8

    Therefore, the number of constituent particles (atoms) present in a unit cell

  • Question 6
    1 / -0.25

    Which among the following is a neutral complex?

    Solution

    A neutral complex is a complex ion which have no charge on it. Among the given options [Pt(NH3 )2Cl2 ] is a neutral complex. The type of complexes in other options are as follows

    (a) [Fe(H2 O)6 ]Cl3 - cationic complexes

    (b) [Ni(NH3 )6 ]Cl2 - cationic complexes

    (d) K[Ag(CN)2 ] - anionic complexes

  • Question 7
    1 / -0.25

    Limestone is used as a flux In the extraction of

    Solution

    Limestone is used as a flux in the extraction of iron because it decomposes in a hot furnace to form calcium oxide and carbon dioxide. The formed calcium oxide actually acts as a flux and is combined with stica to form fustole calcium silicate slag.

  • Question 8
    1 / -0.25

    How many isomers are possible for an akane having molecular formula C5H12?

    Solution

    There can be 3 possible isomers (or an alkane having formula C5 H12 . These are as follows

  • Question 9
    1 / -0.25

    Two moles of an ideal gas is expanded isothermally and reversibly at 300 K from 1L to 10 L. The enthalpy change in kJ is

    Solution

    The enthalpy change at constant pressure is given as

    ΔH = CpΔT

    For isothermal expansion

    ΔT = 0

    ∴ ΔH = 0

  • Question 10
    1 / -0.25

    The bond angle H —O —O in H2 O2 in gaseous phase is

    Solution

    The molecular dimensions of H2 O2 in the gaseous phase is shown in the following figure.

    Thus, the bond angle H —O —O in H2 O2 in gaseous phase is 94.8 º

  • Question 11
    1 / -0.25

    The activation energy of a reaction is zero. Its rate constant at 280 K is 1.6 x 10-6 s-1 , the rate constant at 300 K is

    Solution

    Key Idea: Arrhenius equation is given as

    Given.

    Activation energy of a reaction, EA = 0

    Rate constant, k1 , = 1.6 x 10-6 s-1

    Temperature, T1 = 280K,T2 = 300 K

    According to Arrhenius equation

    k2 =1.6 x 10-6 s-1

  • Question 12
    1 / -0.25

    Which of the following is not a broad spectrum antibiotics?

    Solution

    Antibiotics which kill or inhibit a wide range of gram positive and gram negative bacteria are called broad spectrum antibiotics. Among the given options. penicillIn is not a broad spectrum antibiotics. It is a narrow spectrum antibiotics, i.e. it is effective mainly against specific fancies of bacteria.

  • Question 13
    1 / -0.25

    The reaction in which 2 molecules of chlorobenzene reacts with metallic sodium in presence of dry ether forming diphenyl Is an example of.

    Solution

    The reaction is which 2 molecules of chlorobenzene reacts with metallic sodium in presence of dry ether forming diphenyl is an example of Wurtz-Fittig reaction.

    For reaction can be written as:

  • Question 14
    1 / -0.25

    Isobutylene on hydroboration followed by oxidation with hydrogen peroxide in the presence of base yields

    Solution

    The hydroboration oxidation of an alkene will give the alcohol as the product and the OH group will attach to the carbon which is less hindered. Thus this reaction follows Anti-Markownikoff 's rule.

    Hence isobutylene on hydroboration oxidation will isobutyl alcohol.

  • Question 15
    1 / -0.25

    Which of the following molecules form a Zwitter ion?

    Solution

    Zwitter ion is a molecule containing a positively charged ion at one end and a negatively charged ion at the other. Among the given compounds amino acid.

    H2 NCH2 COOH forms a Zwtter ion which is shown below.

  • Question 16
    1 / -0.25

    Propene when treated with a cold cone. H2SO4forms a compound which on heating with water gives

    Solution

    Propone when treated with cold cone. H2 SO4 forms a compound, isopropyl* hydrogen sulphate on heating with water gives propan-2-ol.

  • Question 17
    1 / -0.25

    For a chemical reaction rate law is, rate = k[A]2[B]. If [A] is doubled at constant [B], the rate of reaction

    Solution

    Given,

    Initial rate = k[A]2 [B]

    Rate k = [2A]2 [B] = 4k[A]2 [B]

    Thus if the concentration of A, [A] is doubled and that of [B] is constant, then initial rate increases by a factor of 4.

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