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Day 125: JEE Mains Chemistry

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

  1. Question 1

    Chemical Kinetics. Asked once: 23 Jan 2025 (same type asked 6 times) See all 6 of this type

    49
    For the thermal decomposition of N2O5( g)N_{2}O_{5}(\text{ }g) at constant volume, the following table can be formed, for the reaction mentioned below :
    2 N2O5( g)→2 N2O4( g)+O2( g)2{\text{ }N}_{2}O_{5}(\text{ }g) \rightarrow 2{\text{ }N}_{2}O_{4}(\text{ }g) +O_{2}(\text{ }g)
    S. No.Time/sTotal pressure/atm
    100.6
    2100xx
    x=x = ____\_\_\_\_ ×10−3 atm\times10^{- 3}\text{ }atm [nearest integer] Given : Rate constant for the reaction is 4.606×10−2 s−14.606 \times10^{- 2}{\text{ }s}^{- 1}.

  2. Question 2

    The d- and f-Block Elements. Asked once: 21 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    50
    Consider the following reactions:
    NaCl+K2Cr2O7+H2SO4→ A+KHSO4+NaHSO4+H2OA+NaOH→B+NaCl+H2OB+H2SO4+H2O2→C+Na2SO4+H2O\begin{gathered}NaCl + K_{2}{Cr}_{2}O_{7} + H_{2}{SO}_{4} \rightarrow \text{ }A + {KHSO}_{4} + {NaHSO}_{4} + H_{2}O \\ A + NaOH \rightarrow B + NaCl + H_{2}O \\ B + H_{2}{SO}_{4} + H_{2}O_{2} \rightarrow C + {Na}_{2}{SO}_{4} + H_{2}O\end{gathered}
    In the product ' C ', ' X ' is the number of O22−O_{2}^{2 -} units, ' Y ' is the total number oxygen atoms present and ' ZZ ' is the oxidation state of Cr . The value of X+Y+ZX + Y + Z is ____.

  3. Question 3

    The d- and f-Block Elements. Asked once: 7 Apr 2025 (same type asked 6 times) See all 6 of this type

    109
    ' X ' is the number of acidic oxides among VO2VO_{2}, V2O3,CrO3, V2O5V_{2}O_{3},CrO_{3},{\text{ }V}_{2}O_{5} and Mn2O7Mn_{2}O_{7}. The primary valency of cobalt in [Co(H2NCH2CH2NH2)3]2(SO4)3\left\lbrack Co\left( H_{2}NCH_{2}CH_{2}NH_{2} \right)_{3} \right\rbrack_{2}\left( SO_{4} \right)_{3} is Y . The value of X+YX + Y is :

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  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 4 Apr 2024 (same type asked 6 times) See all 6 of this type

    128
    The adsorbent used in adsorption chromatography is/are (A) silica gel (B) alumina (C) quick lime (D) magnesia Choose the most appropriate answer from the options given below:

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  5. Question 5

    The d- and f-Block Elements. Asked once: 30 Jan 2024 (same type asked 6 times) See all 6 of this type

    46
    Match List-I with List-II List-I List-II Species Electronic distribution (A) Cr+2Cr^{+ 2} (I) 3d83d^{8} (B) Mn+Mn^{+} (II) 3 d34 s13{\text{ }d}^{3}4{\text{ }s}^{1} (C) Ni+2Ni^{+ 2} (III) 3 d43{\text{ }d}^{4} (D) V+V^{+} (IV) 3 d54 s13{\text{ }d}^{5}4{\text{ }s}^{1} Choose the correct answer from the options given below:

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