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Day 369: JEE Mains Chemistry

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

  1. Question 1

    Coordination Compounds. Asked once: 25 Jan 2023 (same type asked 10 times) See all 10 of this type

    57
    The number of paramagnetic species from the following is
    [Ni(CN)4]2−,[Ni(CO)4],[NiCl4]2−[Fe(CN)6]4−,[Cu(NH3)4]2+[Fe(CN)6]3− and [Fe(H2O)6]2+\begin{matrix} & \left\lbrack Ni(CN)_{4} \right\rbrack^{2 -},\left\lbrack Ni(CO)_{4} \right\rbrack,\left\lbrack NiCl_{4} \right\rbrack^{2 -} \\ & \left\lbrack Fe(CN)_{6} \right\rbrack^{4 -},\left\lbrack Cu\left( NH_{3} \right)_{4} \right\rbrack^{2 +} \\ & \left\lbrack Fe(CN)_{6} \right\rbrack^{3 -}\text{~and~}\left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack^{2 +} \end{matrix}

  2. Question 2

    Some Basic Concepts of Chemistry. Asked once: 26 Jul 2022 (same type asked 10 times) See all 10 of this type

    121
    Hemoglobin contains 0.34%0.34\% of iron by mass. The number of FeFe atoms in 3.3 g3.3\text{ }g of hemoglobin is (Given : Atomic mass of FeFe is 56 u56\text{ }u, NA=6.022×1023 mol−1N_{A} = 6.022 \times 10^{23}\text{ }mol^{- 1})

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  3. Question 3

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 26 Jun 2022 (same type asked 10 times) See all 10 of this type

    58
    On complete combustion 0.30 g0.30\text{ }g of an organic compound gave 0.20 g0.20\text{ }g of carbon dioxide and 0.10 g0.10\text{ }g of water. The percentage of carbon in the given organic compound is (Nearest Integer)

  4. Question 4

    Coordination Compounds. Asked once: 29 Jan 2023 (same type asked 10 times) See all 10 of this type

    132
    Correct order of spin only magnetic moment of the following complex ions is: (Given At. no. Fe: 26, Co: 27)

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  5. Question 5

    Chemical Bonding and Molecular Structure. Asked once: 26 Jun 2022 (same type asked 10 times) See all 10 of this type

    143
    Amongst SF4,XeF4,CF4SF_{4},XeF_{4},CF_{4} and H2OH_{2}O, the number of species with two lone pairs of electrons