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Day 52: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Coordination Compounds. This type asked 3 times: 2021 Paper 8, 1 Feb 2023, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 3 of this type

    36
    Which of the following complexes will show coordination isomerism? (A) [Ag(NH3)2][Ag(CN)2]\left\lbrack Ag\left( {NH}_{3} \right)_{2} \right\rbrack\left\lbrack Ag(CN)_{2} \right\rbrack (B) [Co(NH3)6][Cr(CN)6]\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack\left\lbrack Cr(CN)_{6} \right\rbrack (C) [Co(NH3)6][Co(CN)6]\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack\left\lbrack Co(CN)_{6} \right\rbrack (D) [Fe(NH3)6][Co(CN)6]\left\lbrack Fe\left( {NH}_{3} \right)_{6} \right\rbrack\left\lbrack Co(CN)_{6} \right\rbrack (E) [Co(NH3)6][Fe(CN)6]\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack\left\lbrack Fe(CN)_{6} \right\rbrack Choose the correct answer from the options given below :

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  2. Question 2

    Solutions. This type asked 3 times: 26 Jun 2022, 24 Jan 2026 S1, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 3 of this type

    30
    Solution A is prepared by dissolving 1 g of a protein (molar mass =50000 g mol−1= 50000\text{ }g{\text{ }mol}^{- 1} ) in 0.5 L of water at 300 K . Its osmotic pressure is x bar. Solution B is made by dissolving 2 g of same protein in 1 L of water at 300 K . Osmotic pressure of solution BB is y bar. Entire solution of AA is mixed with entire solution of BB at same temperature. The osmotic pressure of resultant solution is zz bar. x,yx,y and z respectively are : ( R=0.083 LR = 0.083\text{ }L bar mol−1 K−1mol^{- 1}{\text{ }K}^{- 1} )

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  3. Question 3

    Structure of Atom. This type asked 3 times: 2021 Paper 19, 23 Jan 2026 S2, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 3 of this type

    46
    The surface of sodium metal is irradiated with radiation of wavelength x nm . The kinetic energy of ejected electrons is 2.8×10−20 J2.8 \times 10^{- 20}\text{ }J. The work function of sodium is 2.3 eV . The value of x is ____\_\_\_\_ ×102 nm\times 10^{2}\text{ }nm. (Nearest integer) (Given : h=6.6×10−34 J s;1eV=1.60×10−19 Jh = 6.6 \times 10^{- 34}\text{ }J\text{ }s;1eV = 1.60 \times 10^{- 19}\text{ }J; c=3.0×108 ms−1c = 3.0 \times 10^{8}{\text{ }ms}^{- 1} )

  4. Question 4

    The d- and f-Block Elements. This type asked 3 times: 2021 Paper 22, 30 Jan 2024, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 3 of this type

    49
    Number of paramagnetic ions among the following d- and f-block metal ions is ____\_\_\_\_ . Mn2+,Cu2+,Zn2+,Yb2+,Sc3+,La3+,Gd3+,Lu3+,Ti4+{Mn}^{2 +},{Cu}^{2 +},{Zn}^{2 +},{Yb}^{2 +},{Sc}^{3 +},{La}^{3 +},{Gd}^{3 +},{Lu}^{3 +},{Ti}^{4 +}, Ce4+{Ce}^{4 +} (Atomic number of Mn=25,Cu=29,Zn=30Mn = 25,Cu = 29,Zn = 30, Yb=70,Sc=21,La=57,Gd=64,Lu=71Yb = 70,Sc = 21,La = 57,Gd = 64,Lu = 71, Ti=22,Ce=58Ti = 22,Ce = 58 )

  5. Question 5

    The d- and f-Block Elements. This type asked 3 times: 5 Apr 2024, 28 Jan 2025, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 3 of this type

    45
    Among Fe2+,Fe3+,Cr2+Fe^{2 +},Fe^{3 +},Cr^{2 +} and Zn2+Zn^{2 +}, the ion that shows positive borax bead test and with highest ionisation enthalpy is:

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