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# NEET Chemistry Solved Question Paper 2005

#### Multiple Choice Questions

1.

Cationic hydrolysis gives the following solution :

• acidic

• basic

• neutral

• amphoteric

B.

basic

Cationic hydrolysis always forms basic solution .

2.

Which has smallest size ?

• Na+

• Mg2+

• Ne

• O2-

B.

Mg2+

Among isoelectronic species , size decreases with increase in nuclear charge .Hence , the order of size is _

Mg2+ < Na+ < O2-

3.

Which is the correct relation for diffusion of gases :

• $\propto$ d

• $\propto$ $\sqrt{\mathrm{d}}$

• $\propto$ $\frac{1}{\sqrt{\mathrm{d}}}$

• none of these

C.

$\propto$ $\frac{1}{\sqrt{\mathrm{d}}}$

According to Graham for an ideal gas ,

$\propto$ $\frac{1}{\sqrt{\mathrm{d}}}$

4.

Atomic number of an element is equal to the number of :

• protons

• neutrons

• electrons

• protons + neutrons

D.

protons + neutrons

Atomic number of an element is always equal to the number of protons in its atom while mass number is equal to the sum of the number of protons and neutrons .

5.

Hybridization present in ClF3 is :

• sp2

• sp3

• dsp2

• sp3d

D.

sp3d

In ClF3 molecule , Cl atom is sp3d hybridised and due to the presence of two lone pairs of electrons , it has T-shaped geometry .

6.

Isotopic pair is :

• 20X4021X40

• 20X40 , 20X41

• 40X2041X20

• None

B.

20X40 , 20X41

Isotopes are the atoms of an element which have same atomic number but different mass number .

# 7.H - I - O bond angle in H2O2 :90o 180o 109.5o 94.8o

D.

94.8o

The bond angle of H2O2 is 94.8o .

8.

Hydrolysis of sodium acetate gives :

• acidic solution

• basic solution

• amphoteric solution

• neutral solution

B.

basic solution

Sodium acetate is a salt of weak acid and strong base hence its aquous solution is basic .

C-H3CONa $\stackrel{{\mathrm{H}}_{2}\mathrm{O}}{⇌}$ $\underset{\mathrm{Weak}}{{\mathrm{CH}}_{3}\mathrm{COOH}}$ + $\underset{\mathrm{Strong}}{\mathrm{NaOH}}$

9.

Electron deficient molecule is :

• CCl4

• PCl5

• BF3

• SF6

C.

BF3

Structure of BF3 is ;

In this example octet is incomplete .

10.

Number of electrons surrounding Kr in KrF2 is :

• 10

• 6

• 4

• 8

A.

10

Total no. of electron which are found around , Kr in KrF2 are 10 .