Which of the following has least covalent P-H bond? from Chemist

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

For a particular value of azimuthal quantum number, the total number of magnetic quantum number values are given by

  • l = m + 12

  • l = m - 12

  • l = 2m + 12

  • m = 2l + 12


2.

What is the wavelength of an α-particle having mass 6.6 × 10-27 kg moving with a speed of 105 cms-1? ( h = 6.6 × 10-34 kgm2 - s)?

  • 2 × 10-12 m

  • 3 × 10-10 m

  • 1 × 10-10 m

  • 2 × 10-10 m


3.

How many unpaired electrons are present in Ni2+ cation? (Z = 28)

  • 0

  • 2

  • 4

  • 6


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4.

Which of the following has least covalent P-H bond?

  • PH3

  • P2H6

  • P2H5

  • PH6+


D.

PH6+

Due to presence of positive center over P-atom in PH6+, it attracts the electrons of P-H bond towards itself. As a result P-H bonds acquire some ionic character, hence P-H bonds in PH6+ is least covalent.


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5.

A compound on burning in air produces three oxides. Out of these one oxide turns lime water milky, the second one turned anhydrous CuSO4 blue and third forms a solution of pH = 9. The compound is made up of

  • S, N and H

  • S, H and Na

  • S and N

  • S, C and H


6.

An oxide of a non-metal has the following properties

(i) It acts both as proton donor as well as proton acceptor

(ii) It reacts readily with basic and acidic oxides

(iii) It oxidies Fe at its boiling point. The oxide maybe

  • P2O5

  • SiO2

  • H2O

  • CO2


7.

Which of the following ion is diamagnetic?

  • Nd3+

  • La3+

  • Tb3+

  • Er3+


8.

An aqueous solution of titanium chloride, when subjected to magnetic measurement, show zero magnetic moment. The formula of complex in aqueous solution is

  • [Ti(H2O)6]Cl4

  • [Ti(H2O)6]Cl3

  • [Ti(H2O)5Cl]Cl2

  • [Ti(H2O)6]Cl


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9.

For the reaction

N(g) + 3H2 (g)  2NH3 (g) H is equal to

  • E - 2RT

  • E - RT

  • E + RT

  • E + 2RT


10.

The conjugate base of NH2- is

  • NH3

  • NH2-

  • NH4+

  • N3-


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