JEE Advance - Chemistry (1986)

• 1

  The bond between two identical non-metal atoms has a pair of electrons

  回答

  (D)

  equally shared between them
• 2

  A molal solution is one that contains one mole of solute in

  回答

  (A)

  1000 g of solvent
• 3

  Complete and balance the following equation:
  
  Mn²⁺ + PbO₂ $$\to$$ $$MnO_4^-$$ + H₂O

  回答

  (C)

  2Mn²⁺ + 5PbO₂ + 16H⁺ $$\to$$ 2MnO₄^- + 5Pb²⁺ + 8H₂O
• 4

  Complete and balance the following equation:
  
  $$ClO_3^-$$ + I^- + H₂SO₄ $$\to$$ Cl^- + $$HSO_4^-$$

  回答

  (B)

  $$6I^- + ClO_3^- + 3H_2SO_4 \to Cl^- + 3HSO_4^- + 3I_2 + 3H_2O$$
• 5

  Complete and balance the following equation:
  
  S + OH^- $$\to$$ S^2- + $$S_2O_3^-$$

  回答

  (D)

  4S + 6OH^- $$ o$$ 2S^2- + $$S_2O_3^-$$ + 3H₂O
• 6

  Complete and balance the following equation:
  
  Ag⁺ + AsH₃ $$\to$$ H₃AsO₃ + H⁺

  回答

  (C)

  6Ag⁺ + AsH₃ + 3H₂O $$ o$$ 6Ag + H₃AsO₃ + 6H⁺
• 7

  Arrange the following in increasing oxidation number of iodine.
  
  I₂, HI, HIO₄, ICl

  回答

  (D)

  HI < I₂ < ICl < HIO₄
• 8

  The electron density in the XY plane in 3d_{x² - y²} orbital is zero

  回答

  (B)

  FALSE
• 9

  Rutherford's alpha particle scattering experiment eventually led to the conclusion that:

  回答

  (B)

  electrons occupy space around the nucleus
• 10

  The ratio of the energy of a photon of 2000Å wavelength to that 4000Å radiation is

  回答

  (D)

  2
• 11

  Which one of the following sets of quantum numbers represents an impossible arrangement?

  回答

  (C)

  n = 3, l = 2, m_l = -3, m_s = 1/2
• 12

  The sum of the number of neutrons and proton in the isotope of hydrogen is

  回答

  (D)

  3
• 13

  Arrange the following in:
  Increasing size:
  Cl^-, S^2-, Ca²⁺, Ar

  回答

  (C)

  Ca²⁺ < Ar < Cl^- < S^2-
• 14

  The hydrogen bond is strongest in

  回答

  (C)

  F - H........F
• 15

  The hybridisation of sulphur in sulphur dioxide is

  回答

  (C)

  sp²
• 16

  CO₂ is isostructural with

  回答

  A

  C
• 17

  Write the lewis dot structure of the following:
  O₃, COCl₂

  回答

  (B)

  The image shows the Lewis dot structures for O3 and COCl2 correctly.
• 18

  The rate of diffusion of gas is _______ proportional to both ________ and square root of molecular mass.

  回答

  (D)

  inversely, pressure
• 19

  The average velocity of an ideal gas molecule at 27^oC is 0.3m/sec. The average velocity at 927^oC will be

  回答

  (A)

  0.6 m/sec
• 20

  The softness of group I-A metals increases down the group with increasing atomic number.

  回答

  (B)

  FALSE
• 21

  The pair of compound which cannot exist together in solution is:

  回答

  (A)

  NaHCO₃ and NaOH
• 22

  Give reasons of the following:
  Hydrogen peroxide is a better oxidising agent than water.

  回答

  B

  C

  E
• 23

  Write the IUPAC name of :
  CH₃CH₂CH = CHCOOH

  回答

  (B)

  2-Pentenoic acid
• 24

  The vapour pressure of ethanol and methanol are 44.5 and 88.7 mm Hg respectively. An ideal solution is formed at the same temperature by mixing 60 g of ethanol with 40 g of methanol. Calculate the total vapour pressure of the solution and the mole fraction of methanol in the vapour.

  回答

  (A)

  P = 65.71 mm Hg, mole fraction of methanol = 0.66