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# NEET Chemistry Solved Question Paper 2012

#### Multiple 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

$\underset{\mathrm{s}}{\mathrm{AgCl}}$ $⇌$ $\underset{\mathrm{S}}{{\mathrm{Ag}}^{+}}$ + $\underset{\mathrm{s}}{{\mathrm{Cl}}^{-}}$

Solubility = 1.435 g/L

Solubility = $\frac{1.435}{143.5}$ 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+

• ${\mathrm{H}}_{2}^{+}$

• H3O+

• H4O+

C.

H3O+

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

H2O + H+ $\to$ 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 $\to$ 4CO2 + 6H2O

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

4 L =

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- $\to$ X2Y3

# 20.The strongest Bronsted base is :HCl${\mathrm{O}}_{2}^{-}$ HClO- HCl${\mathrm{O}}_{3}^{-}$ 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 .