JEE Advance - Chemistry (2012 - Paper 1 Offline)

• 1

  The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [$$\alpha_0$$ is Bohr radius]

  پاسخ دهید

  (C)

  $${h^2 \over {32{\pi ^2}m\alpha _0^2}}$$
• 2

  An organic compound undergoes first-order decomposition. The time taken for its decomposition to 1/8 and 1/10 of its initial concentration are t_1/8 and t_1/10 respectively. What is the value of $$\left[ {{{{t_{1/8}}} \over {{t_{1/10}}}}} \right] \times 10$$? ($${\log _{10}}2 = 0.3$$)

  پاسخ دهید

  9
• 3

  The periodic table consists of 18 groups. An isotope of copper, on bombardment with protons undergoes a nuclear reaction yielding element X as shown below. To which group, element X belongs in the periodic table?
  
  $${}_{29}^{63}Cu$$ + $${}_1^1H$$ $$\to$$ $$6{}_0^1n$$ + $${}_2^4\alpha $$ + 2$${}_1^1H$$ + X

  پاسخ دهید

  8
• 4

  29.2 % (w/w) HCl stock solution has density of 1.25 g mL^-1 . The molecular weight of HCl is 36.5 g mol^-1 . The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is

  پاسخ دهید

  8
• 5

  Choose the correct reason for the stability of the Iyophobic colloidal particles

  پاسخ دهید

  A

  D
• 6

  In allene (C₃H₄), the type(s) of hybridisation of the carbon atoms is (are):

  پاسخ دهید

  (B)

  sp and sp²
• 7

  The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [$$\alpha_0$$ is Bohr radius]

  پاسخ دهید

  (C)

  $${h^2 \over {32{\pi ^2}m\alpha _0^2}}$$
• 8

  A compound M_pX_q has cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below. The empirical formula of the compound is

  

  پاسخ دهید

  (B)

  MX₂
• 9

  As per IUPAC nomenclature, the name of the complex $$[Co{({H_2}O)_4}{(N{H_3})_2}]C{l_3}$$ is

  پاسخ دهید

  (D)

  Diamminetetraaquacobalt (III) chloride.
• 10

  Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?

  پاسخ دهید

  (B)

  HNO₃, NO, N₂, NH₄Cl
• 11

  For one mole of a van der Waals gas when b = 0 and T = 300 K, the PV vs. 1/V plot is shown below. The value of the van der Waals constant a (atm L² mol^$$-$$2) is

  

  پاسخ دهید

  (C)

  1.5
• 12

  The number of aldol reactions that occur in the given transformation are

  

  پاسخ دهید

  (C)

  3
• 13

  The colour of light absorbed by an aqueous solution of CuSO₄ is

  پاسخ دهید

  (A)

  orange-red
• 14

  The number of optically active products obtained from the complete ozonolysis of the given compound is ______.

  

  پاسخ دهید

  (A)

  0
• 15

  Which of the following hydrogen halides reacts with AgNO₃(aq.) to give a precipitate that dissolves in Na₂S₂O₃ (aq.) ?

  پاسخ دهید

  A

  C

  D
• 16

  Identify the binary mixtures that can be separated into individual compounds, by differential extraction, as shown in the given scheme.

  

  پاسخ دهید

  B

  D
• 17

  For an ideal gas, consider only P-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure. Which of the following choice(s) is(are) correct? (Take $$\Delta$$S as change in entropy and W as work done)

  

  پاسخ دهید

  A

  C
• 18

  Which of the following molecules, in pure form, is(are) unstable at room temperature?

  پاسخ دهید

  B

  C
• 19

  The substituents R₁ and R₂ for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0 ?

  

  Peptide	$${R_1}$$	$${R_2}$$
  I	H	H
  II	H	$$C{H_3}$$
  III	$$C{H_2}COOH$$	H
  IV	$$C{H_2}CON{H_2}$$	$${(C{H_2})_4}N{H_2}$$
  V	$$C{H_2}CON{H_2}$$	$$C{H_2}CON{H_2}$$
  VI	$${(C{H_2})_4}N{H_2}$$	$${(C{H_2})_4}N{H_2}$$
  VII	$$C{H_2}COOH$$	$$C{H_2}CON{H_2}$$
  VIII	$$C{H_2}OH$$	$${(C{H_2})_4}N{H_2}$$
  IX	$${(C{H_2})_4}N{H_2}$$	$$C{H_3}$$

  پاسخ دهید

  4
• 20

  When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form is ____________.

  

  پاسخ دهید

  8