NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


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



Best reagent for the conversion of AgNO3 to Ag is

  • HClO4

  • H3PO2

  • HIO4

  • I2



H3PO2 is a good reducing agent as it contains two P-H bonds and thus reduces AgNO3 to Ag.

4AgNO3 + H3PO2 + 2H2 4Ag  + H3PO4 + 4HNO3


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


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

  • SO2

  • XeF2

  • SiF4

  • CH4


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


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)


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.


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+


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.


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.