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Today’s Test
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White vitriol has the formula :

  • Solution

    ZnSO4.7H2O is White vitriol

    FeSO4.7H2O is Green vitriol

    CuSO4.5H2O is Blue vitriol

2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly

  • Solution

    Ease of replacement of H-atom 3° > 2° > 1°.

The maximum number of molecules are present in

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When an electron is removed from an atom, its energy

  • Solution

    Energy is supplied in order to remove electron from atoms. So energy of atom increases when electron is removed from atom.

The term that corrects for the attractive forces present in areal gas in the van der Waals equation is

  • Solution

    Correction factor for attractive force for n moles of real gas is given by the term mentioned in (b).

The density of 0.5 M glucose solution is 1.0900 g ml–1. The molality of the solution is

  • Solution

    Mass of 1 L (= 1000 ml)solution =1000 × 1.090 = 1090g
    Mass of glucose in 1L = 0.5 × 180 = 90 g.
    Mass of water = 1090.0 g – 90.0 g= 1000 g
    Hence, molality = \(\frac{0.5 \times 1000}{1000}\) = 0.5

DIRECTIONS: These are Assertion-Reason type questions.Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :Camphor is used as solvent in the determination of molecular masses of naphthalene,anthraceneetc.
Statement-2 :Camphor has high molal elevation constant

  • Solution

    Camphor has high molal depression constant.

The quantity of DDT in food chain

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Which of the following relations is correct with respect to first (I) and second (II) ionization potentials of sodium and magnesium?

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Which one of the following is a correct statement:

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    Solubility depends upon temperature. In most cases it increases with rise in temperature but in those cases where the process of dissolution is exothermic,solubility decreases with rise in temperature.

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The simplest way to check whether a system is colloidal or not is by

  • Solution

    Tyndall effect is the simplest way to check colloidal system since path of light beam becomes visible due to scattering of light.

Among of the following statements the correct one is

  • Solution

    Zinc blende is ZnS and iron pyrite is FeS.

Water is :

  • Solution

    Polarity of bond depends on difference in electronegativity of the two concerned atoms. H2O is more polar than H2S because oxygen (in O–H)is more electronegative than sulphur (in S–H).

The first order rate constant for the decomposition of N2O5 is 6.2 × 10-4sec-1. The half life period for this decomposition in seconds is

  • Solution

Which of the following ions can exhibit optical isomerism–

  • Solution

    cis-[Co(en)2Cl2]+: cis-[M(aa)2b2] can show optical isomerism.

A weak acid, HA is found to be 10% ionized in 0.01 M aqueous solution.Calculate the pH of a solution which is 0.1 M in HA and 0.05 M in Na A.

  • Solution

    α= 0.1,
    \(K_{a}=\frac{\alpha ^{2}C}{1-\alpha }=\frac{(0.1)^{2}\times (0.01)}{(1-0.1)}= 1.11\times 10^{-4}\)

    Now pKa= –log 1.11×10-4=3.9542

    \(pH=pK_{a}+log\frac{[salt]}{[acid]}\)

    = 3.9542 +log\(\left [ \frac{0.05}{0.10} \right ]= 3.653\)

Dalton’slaw of partial pressure will not apply to which of the following mixture of gases

  • Solution

    Because H2 & Cl2 gases may react with each other to produce HCl gas hence Dalton’s law is not applicable.

Which of the following atoms will have the smallest size ?

  • Solution

    Within a period, the size decreases from left to right, i.e.,Na > Mg > Li > Be. Atomic size increases down the group.

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