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Day 264: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 27 Jun 2022 (same type asked 3 times) See all 3 of this type

    31
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: At 10∘C10^{\circ}C, the density of a 5 M5\ M solution of KClKCl [atomic masses of KK and ClCl are 39 and 35.5 g mol−135.5\ g\ mol^{-1}] is x g mL−1x\ g\ mL^{-1}. The solution is cooled to −21∘C-21^{\circ}C. The molality of the solution will remain unchanged. Reason R: The molality of a solution does not change with temperature as mass remains unaffected with temperature. In the light of the above statements, choose the correct answer from the options given below:

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  2. Question 2

    Some Basic Concepts of Chemistry. Asked once: 2021 Paper 3 (same type asked 3 times) See all 3 of this type

    38
    Complete combustion of 1.80 g1.80\text{ }g of an oxygen containing compound (CxHyOz)\left( C_{x}H_{y}O_{z} \right) gave 2.64 g2.64\text{ }g of CO2CO_{2} and 1.08 g1.08\text{ }g of H2OH_{2}O. The percentage of oxygen in the organic compound is:

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  3. Question 3

    Amines. Asked once: 2021 Paper 2 (same type asked 3 times) See all 3 of this type

    44
    The diazonium salt of which of the following compounds will form a coloured dye on reaction with β\beta-Naphthol in NaOHNaOH?

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  4. Question 4

    Chemical Thermodynamics. Asked once: 10 Apr 2023 (same type asked 3 times) See all 3 of this type

    43
    Given (A) 2CO(g)+O2( g)→2CO2( g) ΔH1θ=−xkJmol−12CO(g) +O_{2}(\text{ }g) \rightarrow 2CO_{2}(\text{ }g)\ \Delta H_{1}^{\theta}= - xkJmol^{- 1} (B) C(graphite) +O2+O_{2} (g) →CO2( g)ΔH2θ=−ykJmol−1\rightarrow CO_{2}(\text{ }g)\Delta H_{2}^{\theta}= - ykJmol^{- 1} The ΔHθ\Delta H^{\theta} for the reaction CC (graphite) +12O2( g)→CO(g)+\frac{1}{2}O_{2}(\text{ }g) \rightarrow CO(g) is

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  5. Question 5

    Electrochemistry. Asked once: 28 Jul 2022 (same type asked 3 times) See all 3 of this type

    33
    Match List-I with List-II.
    List-IList-II
    (A)Cd(s)+2Ni(OH)3(s)→CdO(s)+2Ni(OH)2(s)+H2O(l)Cd(s) + 2Ni(OH)_{3}(s) \rightarrow CdO(s) + 2Ni(OH)_{2}(s) + H_{2}O(l)(I)Primary battery
    (B)Zn(Hg)+HgO(s)→ZnO(s)+Hg(l)Zn(Hg) + HgO(s) \rightarrow ZnO(s) + Hg(l)(II)Discharging of secondary battery
    (C)2PbSO4(s)+2H2O(l)→Pb(s)+PbO2(s)+2H2SO4(aq)2PbSO_{4}(s) + 2H_{2}O(l) \rightarrow Pb(s) + PbO_{2}(s) + 2H_{2}SO_{4}(aq)(III)Fuel cell
    (D)2H2(g)+O2(g)→2H2O(l)2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(l)(IV)Charging of secondary battery
    Choose the correct answer from the options given below:

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