Intermolecular hydrogen bonding is strongest in from Chemistry J

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following is the most basic ?


2.

What is the name of the element with atomic number 105?

  • Dubnium

  • Holmium

  • Kurchatovium

  • Nobelium


3.

Consider the ground state of Cr atom (Z= 24). The numbers of electrons with the azimuthal quantum numbers, = 1 and 2 are respectively

  • 12 and 4

  • 12 and 5

  • 16 and 4

  • 16 and 5


4.

Sodium bicarbonate on heating decomposes to form sodium carbonate, CO2 and water. If 0.2 moles of sodium bicarbonate is completely decomposed, how many moles of sodium carbonate is formed?

  • 0.1

  • 0.2

  • 0.05

  • 0.025


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5.

Intermolecular hydrogen bonding is strongest in

  • HCHO

  • CH3OH

  • C6H5OH

  • CH3NH2


B.

CH3OH

Hydrogen bond is found in compound in which H-bond is directly attached to highly electronegative elements as F, O, N. HCHO show very less H-bonding as H-atom is not attached to O atom. CH3OH has stronger H-bond as compared to C6H5OH due to steric hinderance of bulky-C 6H5 group in phenol.


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6.

If standard enthalpies of formation of CaCl (s) (hypothetical) and that of CaCl(s) are -188 J mol-1 and -795 kJ mol-1 respectively, calculate the value of standard heat of reaction for the following  disproportionation reaction

2CaCl (s) → CaCl2 (s) + Ca (s)

  • -607 kJ mol-1

  • +607 kJ mol-1

  • -419 kJ mol-1

  • +419 kJ mol-1


7.

Aluminium chloride exists as dimer, Al2Cl6, in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

  • Al3+ + 3Cl-

  • [Al(H2O6]3+ + Cl-

  • [Al(HO)6]3- + 3HCl

  • Al2O3 + 6HCl


8.

The ions N3-, O2-, F-, Na+, Mg2+ are isoelectronic. Their ionic radii show

  • an increase from N3- to F- and then decrease from N+ to Mg2+

  • a decrease from N3- to F- and then increase from Na+ to Mg2+

  • a significant increase from N3- to Mg2+

  • a significant decrease from N3- to Mg2+


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9.

Which of the following is not true?

  • In a first order reaction, the half-life is independent to the initial concentration of reactant.

  • A given piece of charcoal shows increase in its surface area in its powdered form.

  • In valence bond of H2, each electron spends its time around its own nucleus

  • In valence bond of H2, both the electrons spend their time around both the nucleus


10.

250 mL of a Na2CO3 solution contains 2.65 g of Na2CO3 10 mL of this solution is added to x mL of water to obtain 0.001 M Na2CO3 solution.The value of x is (molecular weight of Na2CO3 = 106)

  • 1000 mL

  • 990 mL

  • 9990 mL

  • 90 mL


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