NEW
New Website Launch
Experience the best way to solve previous year questions with mock tests (very detailed analysis), bookmark your favourite questions, practice etc...
1

AIPMT 2001

MCQ (Single Correct Answer)
In HS$$-$$, I$$-$$, R $$-$$ NH2, NH3 order of proton accepting tendency will be
A
I$$-$$ > NH3 > R $$-$$ NH2 > HS$$-$$
B
NH3 > R $$-$$ NH2 > HS$$-$$ > I$$-$$
C
R $$-$$ NH2 > NH3 > HS$$-$$ > I$$-$$
D
HS$$-$$ > R $$-$$ NH2 > NH3 > I$$-$$

Explanation

Strong base has higher tendency to accept the proton. Increasing order of base and hence the order of accepting tendency of proton is

R $$-$$ NH2 > NH3 > HS$$-$$ > I$$-$$
2

AIPMT 2000

MCQ (Single Correct Answer)
Equilibrium constant Kp for following reaction
MgCO3(s) $$\rightleftharpoons$$ MgO(s) + CO2(g)
A
Kp = PCO2
B
Kp = PCO2 $$ \times $$ $${{{P_{C{O_2}}} \times {P_{MgO}}} \over {{P_{MgC{O_3}}}}}$$
C
Kp = $${{{P_{C{O_2}}} + {P_{MgO}}} \over {{P_{MgC{O_3}}}}}$$
D
Kp = $${{{P_{MgC{O_3}}}} \over {{P_{C{O_2}}} + {P_{MgO}}}}$$

Explanation

Kp = PCO2

As solids do not exert pressure, so their partial pressure is taken as unity.
3

AIPMT 2000

MCQ (Single Correct Answer)
For any reversible reaction, if we increase concentration of the reactants, then effect on equilibrium constant
A
depends on amount of concentration
B
unchange
C
decrease
D
increase

Explanation

Equilibrium constant of a reaction is independent of the concentration of species involved in the reaction but dependent only on the temperature.
4

AIPMT 2000

MCQ (Single Correct Answer)
Which statement is wrong about pH and H+?
A
pH of neutral water is not zero.
B
Adding 1 N solution of CH3COOH and 1 N solution of NaOH, pH will be seven.
C
[H+] of dilute and hot H2SO4 is more than concentrated and cold H2SO4
D
Mixing solution of CH3COOH and HCl. pH will be less than 7.

Explanation

CH3COOH is weak acid while NaOH is strong base, so one equivalent of NaOH can not be neutralized with one equivalent of CH3COOH. Hence the solution of one equivalent of each does not have pH value as 7. Its pH will be towards basic side as NaOH is a strong base hence conc. of OH will be more than the conc. of H+.

Joint Entrance Examination

JEE Main JEE Advanced WB JEE

Graduate Aptitude Test in Engineering

GATE CSE GATE ECE GATE EE GATE ME GATE CE GATE PI GATE IN

Medical

NEET

CBSE

Class 12