Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The correct electronic configuration of element with atomic number 29 :

  • 1s2 , 2s2p6 , 3s2 3p6 3d10 , 4s1

  • 1s2 , 2s2p6 , 3s2 3p6 3d11

  • 1s2 , 2s2p6 , 3s2 3p17

  • None of the above


A.

1s2 , 2s2p6 , 3s2 3p6 3d10 , 4s1

The correct electronic configuration of element with atomic number = 29

1s2 , 2s2p6 , 3s2 3p6 3d10 , 4s1


12.

The solubility of AgCl is 1.435 g/L. What will be the solubility product ?

  • 10-4

  • 0.01

  • 0.001

  • 0.001


B.

10-4

AgCls  Ag+S + Cl-s

Solubility = 1.435 g/L

Solubility = 1.435143.5 mol/L

143.5 = molecular weight

Solubility product = (s)2

= (0.01)2 = 10-4


13.

The number of H+ ion in half normal solution of Na2CO3 and CH3COOH :

  • > 10-7 m

  • 10-7 m

  • < 10-7

  • 10-5 m


C.

< 10-7

H+ < 10-7 in acidic solution .


14.

The characteristic ion of an acid in an aqueous solution is :

  • H+

  • H2+

  • H3O+

  • H4O+


C.

H3O+

H+ does not remain in the free state in aqueous solution. It remains in the form of H2O .

H2O + H+  H3O+


15.

The compound with maximum covalent character is :

  • AlCl3

  • AlI3

  • AgI2

  • NaI


B.

AlI3

AlI3 having the maximum covalent character , because Al3+ ion is of smallest size so it polarises the I- maximum.


16.

In a group of Periodic Table what is the basis of :

  • ionic potential

  • electron affinity

  • electron negativity

  • number of covalent electron


D.

number of covalent electron

Elements having same number of electron in their valency shell are placed in same group .


17.

NF3 and BF3 both are covalent , but BF3 is non-polar, while NF3 is polar because :

  • boron is non-metal in free state , while N2 is gas

  • there is no dipole moment in B-F  bond while N-F bond have some dipole moment

  • BFis planar while NF, is pyramidal

  • boron atom is smaller than nitrogen atom


B.

there is no dipole moment in B-F  bond while N-F bond have some dipole moment

NFand BF3 both are covalent but BF3 is non polar , while NF3 is polar because there is no dipole moment in BF bond while NF bond have some dipole moment.


18.

For the complete combustion of 4 L ethane , how much oxygen is required ?

  • 14 L

  • 4 L

  • 8 L

  • 12 L


A.

14 L

2C6H6 + 7O2  4CO2 + 6H2O

2 x 22.4 L ethane required to complete burning = 156.8 O2

4 L = 156.82 × 22.4 × 4

14 L O2


19.

If two elements X and Y have 3 and 6 electrons in its outermost shell , then the molecular formula of compound formed by the combination of X and Y :

  • XY

  • X3Y

  • X2Y

  • X2Y3


D.

X2Y3

X has 3 electrons so it forms X3+ ion while Y has 6 electron in its outermost shell therefore it forms Y ion .

X3+ + Y2-  X2Y3


20.

The strongest Bronsted base is :

  • HClO2-

  • HClO-

  • HClO3-

  • HClO4


B.

HClO-

HCIO4 is the strongest acid so its conjugated base will be weakest. While HOCl is weakest acid so its conjugated base is strongest .