#### 11th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - Part Two

11th Standard

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Chemistry

Time : 00:10:00 Hrs
Total Marks : 10

10 x 1 = 10
1. Rate of diffusion of a gas is

(a)

directly proportional to its density

(b)

directly proportional to its molecular weight

(c)

directly proportional to its square root of its molecular weight

(d)

inversely proportional to the square root of its molecular weight

2. All the naturally occurring processes proceed spontaneously in a direction which leads to

(a)

decrease in entropy

(b)

increase in enthalpy

(c)

increase in free energy

(d)

decrease in free energy

3. At a given temperature and pressure, the equilibrium constant values for the equilibria
${ 3A }_{ 2 }+{ B }_{ 2 }+2C\overset { { K }_{ 1 } }{ \rightleftharpoons } { 2A }_{ 3 }BC$ and
${ A }_{ 3 }BC\overset { { K }_{ 2 } }{ \rightleftharpoons } 3/2\left[ { A }_{ 2 } \right] +\frac { 1 }{ 2 } { B }_{ 2 }+C$
The relation between K1 and K2 is

(a)

$K_1={1\over \sqrt{K_2}}$

(b)

$K_2=K_1^{-1/2}$

(c)

$K_1^2=2K_2$

(d)

${K_1\over 2}=K_2$

4. Which of the following concentration terms is/are independent of temperature

(a)

molality

(b)

molarity

(c)

mole fraction

(d)

9a) and (c)

5. In the molecule O= C = OB, the formal charge on OA, C and OB are respectively.

(a)

-1, 0, +1

(b)

+1, 0, -1

(c)

-2, 0, +2

(d)

0, 0, 0

6. In the hydrocarbo $\overset { 7 }{ { CH }_{ 3 } } -\overset { 6 }{ { CH }_{ 2 } } -\overset { 5 }{ CH } =\overset { 4 }{ CH } -\overset { 3 }{ { CH }_{ 2 } } -\overset { 2 }{ CH } =\overset { 1 }{ CH }$ the state of hybridisation of carbon 1,2,3,4 and 7 are in the following sequence.

(a)

sp, sp, sp3, sp2, sp3

(b)

sp2, sp, sp3, sp2, sp3

(c)

sp, sp, sp2, sp, sp3

(d)

none of these

7. What is the hybridisation state of benzyl carbonium ion?

(a)

sp2

(b)

spd2

(c)

sp3

(d)

sp2d

8. ${ C }_{ 2 }{ H }_{ 5 }Br+2Na\overset { dry\quad ether }{ \longrightarrow } { C }_{ 4 }{ H }_{ 10 }+2NaBr$ The above reaction is an example of which of the following

(a)

Reimer Tiemann reaction

(b)

Wurtz reaction

(c)

Aldol condensation

(d)

Hoffmann reaction

9. Of the following compounds, which has the highest boiling point?

(a)

n-Butyl chloride

(b)

Isobutyl chloride

(c)

t-Butyl chloride

(d)

n-propyl chloride

10. Which of the following is natural and human disturbance in ecology?

(a)

Forest fire

(b)

Floods

(c)

Acid rain

(d)

Green house effect