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Day 318: JEE Mains Chemistry

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

  1. Question 1

    Coordination Compounds. Asked once: 8 Apr 2024 (same type asked 19 times) See all 19 of this type

    148
    Total number of unpaired electrons in the complex ion [Co(NH3)6]3+\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack^{3 +} and [NiCl4]2−\left\lbrack NiCl_{4} \right\rbrack^{2 -} is

  2. Question 2

    Chemical Bonding and Molecular Structure. Asked once: 9 Apr 2024 (same type asked 15 times) See all 15 of this type

    35
    In which one of the following pairs the central atoms exhibit sp2sp^{2} hybridization?

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  3. Question 3

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 29 Jan 2025 (same type asked 15 times) See all 15 of this type

    30
    Match List-I with List-II.
    List-I (Structure)List-II (IUPAC Name)
    (A)H3C−CH2−CH(C2H5)−CH2−CH(CH3)−C2H5\mathrm{H_{3}C-CH_{2}-CH(C_{2}H_{5})-CH_{2}-CH(CH_{3})-C_{2}H_{5}}(I)4-Methylpent-1-ene
    (B)
    (CH3)2C(C3H7)2\left( CH_{3} \right)_{2}C\left( C_{3}H_{7} \right)_{2}
    		(II)3-Ethyl-5-methylheptane
    (C)CH2=C(CH3)−CH=CH−CH3\mathrm{CH_{2}=C(CH_{3})-CH=CH-CH_{3}}(III)4,4-Dimethylheptane
    (D)CH2=CH−CH2−CH(CH3)2\mathrm{CH_{2}=CH-CH_{2}-CH(CH_{3})_{2}}(IV)2-Methyl-1,3-pentadiene
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  4. Question 4

    Some Basic Concepts of Chemistry. Asked once: 23 Jan 2025 (same type asked 14 times) See all 14 of this type

    123
    When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is ____\_\_\_\_ . (Nearest integer) Given : Molar mass of Al is 27.0 g mol−127.0\text{ }g{\text{ }mol}^{- 1} Molar mass of O is 16.0 g mol−116.0\text{ }g{\text{ }mol}^{- 1}

  5. Question 5

    Chemical Bonding and Molecular Structure. Asked once: 6 Apr 2024 (same type asked 13 times) See all 13 of this type

    39
    Match List I with List II :
    LIST I (Compound / Species)LIST II (Shape / Geometry)
    A.
    SF4SF_{4}
    		I.Tetrahedral
    B.
    BrF3BrF_{3}
    		II.Pyramidal
    C.
    BrO3−BrO_{3}^{-}
    		III.See saw
    D.
    NH4+NH_{4}^{+}
    		IV.Bent T-shape
    Choose the correct answer from the options given below:

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