Which of the following reactions does not take place?BF3 + F-&nbs

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

According to Bohr's theory, which of the following correctly represents the variation of energy and radius of an electron in nth orbit of H-atom?

  • En  1n2, r 1n2

  • En 1n2, r n2

  • En n2, r n2

  • En n, r 1n


2.

Best reagent for the conversion of AgNO3 to Ag is

  • HClO4

  • H3PO2

  • HIO4

  • I2


3.

KP for the reaction A  B is 4. If initially only A is present then what will be the partial pressure of B after equilibrium?

  • 1.2

  • 0.8

  • 0.6

  • 1


4.

Which of the following molecules has more than one lone pair ?

  • SO2

  • XeF2

  • SiF4

  • CH4


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5.

10 ml of liquid carbon disulphide (specific gravity 2.63) is burnt in oxygen. Find the volume of the resulting gases measured at STP.

  • 23.25 L

  • 22.26 L

  • 23.50 L

  • 20.08 L


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6.

Which of the following reactions does not take place?

BF3 + F- BF4-          ...(I)

BF3 + 3F- BF63-       ...(II)

AlF3 + 3F-  AlF63-    ...(III)

  • Only (I)

  • Only (II)

  • Only (III)

  • Only (I) and (III)


B.

Only (II)

BF3 forms complex halides of the type [BF4-] in which B atom has C.N. 4, it cannot extend its C.N. beyond 4 due to the non-availability of d-orbitals in its configuration. Hence, BF63- ion (sp3d2 hybridisation) is not formed. On the other hand, Al can extend its C.N. beyond 4 due to the availability of d-orbitals in its configuration.


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7.

An element (X) belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of (X)? It has

  • partially filled d orbitals and completely filled s orbital

  • completely filled s orbital and completely filled p orbitals

  • completely filled s orbital and half-filled p orbitals

  • half-filled d orbitals and completely filled s orbital.


8.

Four diatomic species are listed below in different sequences. Which of these represents the correct order of their increasing bond order?

  • C22- < He2+ < NO < O2-

  • He2+ < O2- < NO < C22-

  • O2- < NO < C22- < He2+

  • NO < C22- < O2- < He2+


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9.

The true statement for the acids of phosphorus, H3PO2 H3PO3 and H3PO4 is

  • the order of their acidity is H3PO4 > H3PO3 > H3PO2

  • all of them are reducing in nature

  • all of them are tribasic acids

  • the geometry of phosphorus is tetrahedral in all the three.


10.

Assertion : H3BOis a weak acid.

Reason : Water extracts the proton of H3BO3.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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