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JEE MAIN - Chemistry (2017 (Offline))

  • 1
    The major product obtained in the following reaction is :

    JEE Main 2017 (Offline) Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 218 English
    Trả lời
    (D)
    JEE Main 2017 (Offline) Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 218 English Option 4
  • 2
    Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution?
    Trả lời
    (D)
    JEE Main 2017 (Offline) Chemistry - Biomolecules Question 150 English Option 4
  • 3
    The correct sequence of reagents for the following conversion will be :

    JEE Main 2017 (Offline) Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 219 English
    Trả lời
    (C)
    [Ag(NH3)2]+OH-, H+/ CH3OH, CH3MgBr
  • 4
    Sodium salt of an organic acid ‘X’ produces effervescence with conc. H2SO4. ‘X’ reacts with the acidified aqueous CaCl2 solution to give a white precipitate which decolourises acidic solution of KMnO4. ‘X’ is :
    Trả lời
    (B)
    Na2C2O4
  • 5
    The major product obtained in the following reaction is :

    JEE Main 2017 (Offline) Chemistry - Haloalkanes and Haloarenes Question 144 English
    Trả lời
    (A)
    C6H5CH = CHC6H5
  • 6
    Which of the following, upon treatment with tert-BuONa followed by addition of bromine water, fails to decolorize the colour of bromine?
    Trả lời
    (A)
    JEE Main 2017 (Offline) Chemistry - Haloalkanes and Haloarenes Question 146 English Option 1
  • 7
    3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is :
    Trả lời
    (C)
    Four
  • 8
    The increasing order of the reactivity of the following halides for the SN1 reaction is :

    JEE Main 2017 (Offline) Chemistry - Haloalkanes and Haloarenes Question 145 English
    Trả lời
    (A)
    (II) < (I) < (III)
  • 9
    Which of the following compounds will form significant amount of meta product during mono-nitration reaction?
    Trả lời
    (B)
    JEE Main 2017 (Offline) Chemistry - Compounds Containing Nitrogen Question 205 English Option 2
  • 10
    Which of the following molecules is least resonance stabilized?
    Trả lời
    (C)
    JEE Main 2017 (Offline) Chemistry - Basics of Organic Chemistry Question 225 English Option 3
  • 11
    On treatment of 100 mL of 0.1 M solution of CoCl3. 6H2O with excess AgNO3; 1.2 $$\times$$ 1022 ions are precipitated. The complex is :
    Trả lời
    (C)
    [Co(H2O)5Cl]Cl2.H2O
  • 12
    In the following reactions, ZnO is respectively acting as a/an :

    (a) ZnO + Na2O $$\to$$ Na2ZnO2

    (b) ZnO + CO2 $$\to$$ ZnCO3
    Trả lời
    (C)
    acid and base
  • 13
    The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%); Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all 1H atoms are replaced by 2H atoms is:
    Trả lời
    (B)
    7.5 kg
  • 14
    Two reactions R1 and R2 have identical pre-exponential factors. Activation energy of R1 exceeds that of R2 by 10 kJ mol–1. If k1 and k2 are rate constants for reactions R1 and R2 respectively at 300 K, then ln(k2/k1) is equal to :
    (R = 8.314 J mol–1 K–1)
    Trả lời
    (C)
    4
  • 15
    Which of the following reactions is an example of a redox reaction?
    Trả lời
    (C)
    $$Xe{F_4}$$ + O2F2 $$\to$$ $$Xe{F_6}$$ + O2
  • 16
    pKa of a weak acid (HA) and pKb of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :
    Trả lời
    (A)
    6.9
  • 17
    Two reactions R1 and R2 have identical pre-exponential factors. Activation energy of R1 exceeds that of R2 by 10 kJ mol–1. If k1 and k2 are rate constants for reactions R1 and R2 respectively at 300 K, then ln(k2/k1) is equal to :
    (R = 8.314 J mol–1 K–1)
    Trả lời
    (C)
    4
  • 18
    Which of the following reactions is an example of a redox reaction?
    Trả lời
    (C)
    $$Xe{F_4}$$ + O2F2 $$\to$$ $$Xe{F_6}$$ + O2
  • 19
    pKa of a weak acid (HA) and pKb of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :
    Trả lời
    (A)
    6.9
  • 20
    Given
    $$E_{C{l_2}/C{l^ - }}^o$$ = 1.36 V, $$E_{C{r^{3 + }}/Cr}^o$$ = - 0.74 V
    $$E_{C{r_2}{O_7}^{2 - }/C{r^{3 + }}}^o$$ = 1.33 V, $$E_{Mn{O_4}^ - /Mn ^{2+}}^o$$ = 1.51 V
    Among the following, the strongest reducing agent is :
    Trả lời
    (D)
    Cr
  • 21
    Given, $${C_{(graphite)}} + {O_2} \to C{O_2}(g)$$;

    $${\Delta _r}{H^o}$$ = - 393.5 kJ mol-1

    $${{\rm H}_2}(g)$$ + $${1 \over 2}{O_2}(g)$$$$\to {{\rm H}_2}{\rm O}(l)$$

    $${\Delta _r}{H^o}$$ = - 285.8 kJ mol-1

    $$C{O_2}(g)$$ + $$2{{\rm H}_2}{\rm O}(l) \to$$ $$C{H_4}(g)$$ + $$2{O_2}(g)$$

    $${\Delta _r}{H^o}$$ = + 890.3 kJ mol-1

    Based on the above thermochemical equations, the value of $${\Delta _r}{H^o}$$ at 298 K for the reaction

    $${C_{(graphite)}}$$ + $$2{{\rm H}_2}(g) \to$$ $$C{H_4}(g)$$ will be :
    Trả lời
    (B)
    – 74.8 kJ mol–1
  • 22
    The freezing point of benzene decreases by 0.450C when 0.2 g of acetic acid is added to 20g of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be: (Kf for benzene = 5.12 K kg mol–1)
    Trả lời
    (C)
    94.6 %
  • 23
    The group having isoelectronic species is:
    Trả lời
    (A)
    O2- , F- , Na+, Mg2+
  • 24
    $$\Delta $$U is equal to :
    Trả lời
    (B)
    Adiabatic work