Subject

Chemistry

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

NEET Chemistry Solved Question Paper 2005

Multiple Choice Questions

1.
Hydrolysis of sodium acetate gives :

acidic solution

basic solution

amphoteric solution

neutral solution

basic solution

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

C-H₃CONa $\overset{H_{2} O}{⇌}$ $\underset{Weak}{{CH}_{3} COOH}$ + $\underset{Strong}{NaOH}$

Cationic hydrolysis gives the followingsolution :

acidic
basic
neutral
amphoteric

basic

Cationic hydrolysis always forms basicsolution .

Number of electrons surrounding Kr in KrF₂ is :

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

Isotopic pair is :

₂₀X⁴⁰ , ₂₁X⁴⁰
₂₀X⁴⁰_{, 20}X⁴¹
₄₀X²⁰ , ₄₁X²⁰
None

₂₀X⁴⁰_{, 20}X⁴¹

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

H - I - O bond angle in H₂O₂ :

90^o
180^o
109.5^o
94.8^o

94.8^o

The bond angle of H₂O2 is 94.8^o .

Electron deficient molecule is :

CCl₄
PCl₅
BF₃
SF₆

BF₃

Structure of BF₃ is ;

In this example octet is incomplete .

Hybridization present in ClF₃ is :

sp²
sp³
dsp²
sp³d

sp³d

In ClF₃ molecule , Cl atom is sp³dhybridised and due to the presence oftwo lone pairs of electrons , it hasT-shaped geometry .

Atomic number of an element is equal tothe number of :

protons
neutrons
electrons
protons + neutrons

protons + neutrons

Atomic number of an element is alwaysequal to the number of protons in itsatom while mass number is equal to thesum of the number of protons andneutrons .

Which has smallest size ?

Na⁺
Mg²⁺
Ne
O^2-

Mg²⁺

Among isoelectronic species , sizedecreases with increase in nuclearcharge .Hence , the order of size is^_

Mg²⁺ < Na⁺ < O^2-

10.

Which is the correct relation for diffusionof gases :

r $\propto$ d
r $\propto$ $\sqrt{d}$
r $\propto$ $\frac{1}{\sqrt{d}}$
none of these

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

According to Graham for an ideal gas ,