#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Nine

11th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25

25 x 1 = 25
1. Unit of Avogadro's number is

(a)

mol

(b)

g

(c)

mol -1

(d)

No unit

2. Consider the following statements and pick the incorrect statement(s).
1.Schrodinger wave equation is used to determine the probability of finding a electron at a given point in space.
2.The energy of a electron at infinity is positive
3.Angular momentum quantum number gives information regarding subshells.

(a)

1&3

(b)

only 1

(c)

only 2

(d)

1,2 & 3

3. Which of the following process is important in food industry?

(a)

Dehydration

(b)

Dehalogenation

(c)

Hydrogenation

(d)

Carboxylation

4. In chelating method of softening of hard water ----------- is used

(a)

magnesia

(b)

lime

(c)

EDTA

(d)

washing soda

5. Which one of the following is known as Hydrogen sponge?

(a)

Lithium hydride

(b)

Diborane

(c)

(d)

Ammonia

6. Which of the following is a saline hydride?

(a)

HCI

(b)

NH3

(c)

NaH

(d)

PbH

7. Spodumene is the silicate mineral of _____

(a)

lithium

(b)

sodium

(c)

cesium

(d)

francium

8. Which of the following are stored under oil?

(a)

Alkali metals

(b)

Coinage metals

(c)

Noble metals

(d)

Phosphorous

9. Which of the following is the correct mathematical relation for Charles' law at constant pressure?

(a)

$V\propto T$

(b)

$V\propto t$

(c)

$V\propto \frac{1}{T}$

(d)

all of above

10. The standard free energy change ΔG0 is related to k (equilibrium constant) as

(a)

ΔG0=RT log k

(b)

ΔG0=RT log k

(c)

ΔG0=-2.303 RT log k

(d)

ΔG0=2.303 RT log k

11. Assertion (A): Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason (R): Decrease in enthalpy is a contributory factor for spontaneity.

(a)

both A and R are true and R is the correct explanation of A

(b)

both A and R are true and R is not correct explanation of A

(c)

both A and R are false

(d)

A is false but R is true

12. A pressure cooker reduces cooking time for food because

(a)

Cooking involves chemical changes helped by a rise in temperature

(b)

Heat is more evenly distributed in the cooking space

(c)

Boiling point of water involved in cooking is increased

(d)

The higher pressure inside the cooker crushes the food material

13. According to Valence bond theory, a bond between two atoms is formed when

(a)

fully filled atomic orbitals overlap

(b)

half filled atomic orbitals overlap

(c)

non- bonding atomic orbitals overlap

(d)

empty atomic orbitals overlap

14. $\underset { \underset { OH }{ | } }{ { CH }_{ 3 }-{ CH }_{ 2 }-{ CH }-CH_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 3 } }$ and  $\underset { \underset { OH }{ | } }{ { CH }_{ 3 }-{ CH }_{ 2 }-{ CH_{ 2 } }-CH-{ CH }_{ 3 } }$  are

(a)

Functional isomers

(b)

Position isomers

(c)

Chain isomers

(d)

These are not isomers

15. Which one of the following shows functional group isomerism?

(a)

Ethene

(b)

Acetone

(c)

Ethane

(d)

Propane

16. In  $C{ H }_{ 3 }-\underset { \overset { | }{ C{ H }_{ 3 } } }{ C } H-C{ H }_{ 3 }$ most stable radicals/ions formed on homolysis is/a.

(a)

$C{ H }_{ 3 }-\underset { \overset { | }{ C{ H }_{ 3 } } }{ \overset { . }{ C } } H-C{ H }_{ 2 }$ and H

(b)

$C{ H }_{ 3 }-\underset { \overset { | }{ C{ H }_{ 3 } } }{ \overset { . }{ C } } H-C{ H }_{ 2 }$ and H

(c)

$C{ H }_{ 3 }-\underset { \overset { | }{ C{ H }_{ 3 } } }{ \overset { + }{ C } } -C{ H }_{ 3 }$ and H

(d)

$C{ H }_{ 3 }-\underset { \overset { | }{ C{ H }_{ 3 } } }{ \overset { - }{ C } } -C{ H }_{ 3 }$ and H

17. The most stable carbocation is

(a)

$C{ H }_{ 3 }-\overset { + }{ C } { H }_{ 2 }$

(b)

$C{ H }_{ 3 }-\overset { + }{ C } H-C{ H }_{ 3 }$

(c)

$C{ H }_{ 2 }=CH-\overset { + }{ C } { H }_{ 2 }$

(d)

$\overset { + }{ C } { H }_{ 3 }$

18. The electromeric effect is

(a)

Permanent effect

(b)

Temporary effect

(c)

p-electrons transfer in the effect

(d)

Both (b) and (c)

19. Consider the following compounds,

Hyperconjugation occurs in

(a)

(i) and (iii)

(b)

(i) only

(c)

(ii) only

(d)

(iii) only

20. Statement-I: All the organic molecules contain covalent bonds.
Statement-II: Organic molecules are formed by the mutual sharing of electrons between atoms.

(a)

Statement-I and II are correct and statement-Il is correct explanation of statement-I.

(b)

Statement-I and II are correct but Statement-II is not correct explanation of statement-I.

(c)

Statement-I is correct but statement-Il is wrong.

(d)

Statement-I is wrong but statement-Il is correct.

21. Which one of the following is an example for negative mesomeric effect?

(a)

-SH

(b)

-SR

(c)

-NH2

(d)

-NO2

22. Which of the following is aliphatic saturated hydrocarbon

(a)

C8 H18

(b)

C9 H18

(c)

C8 H14

(d)

All of these

23. ${ CH }_{ 3 }-\overset { \overset { { CH }_{ 3 } }{ | } }{ CH } -{ CH }_{ 2 }-{ CH }3\overset { { CI }_{ 2 } }{ \underset { UV\quad light }{ \longrightarrow } } \underset { Major }{ (A) } ;$ the compound 'A' is

(a)

${ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ CH } -\underset { \overset { | }{ CI } }{ { CH }_{ 2 } } -{ CH }_{ 3 }$

(b)

${ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ CI } }{ C } } -{ CH }_{ 2 }-{ CH }_{ 3 }$

(c)

${ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }-{ CH }_{ 2 }CI$

(d)

${ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 2 }CI } }{ \underset { \overset { | }{ H } }{ C } } -{ CH }_{ 2 }-{ CH }_{ 3 }$

24. Select the correct statement

(a)

Deviation from normal tetrahedral angle in cycloalkane is called angle stain

(b)

Due to torsional stain eclipsed form has higher energy than the staggered form of a compound

(c)

Chair form of cyclohexane is the most stable conformation of cyclohexane

(d)

All of these

25. The cylindrical shape of alkyne is due to

(a)

Two sigma C-C and one $\pi$ C-C bonds

(b)

One sigma C-C and two $\pi$ C-C bonds

(c)

Three sigma C-C bonds

(d)

Three $\pi$ C-C bonds