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

11th Standard

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Chemistry

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

Answer all the questions

25 x 1 = 25
1. Consider the following statements.
(i) d-block elements show variable oxidate states.
(ii) Mostly d-block elements form colourless compounds.
(iii) Mostly d-block elements are diamagnetic due to paired electrons.
Which of the above statement is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(i) and (ii)

(d)

(ii) and (iii)

2. Which of the following is not a periodic property?

(a)

Atomic radius

(b)

Ionization enthalpy

(c)

Electron affinity

(d)

Oxidation number

3. FeSO4 contains _________ molecules of water of hydration.

(a)

5

(b)

7

(c)

10

(d)

12

4. Consider the following statements.
(i) Silver, Gold, Mercury and Platinum do not have any effect on water.
(ii) Carbon, Sulphur and Phosphorous do not react with water.
(iii) Beryllium reacts with water less violently.
Which of the following statements is/are not correct?

(a)

(i) only

(b)

(ii) and (iii)

(c)

(iii) only

(d)

(ii) only

5. Assertion : Beryllium compounds are covalent in nature
Reason : The size of Be2+ ion is larger in comparison to the radii of the other divalent ions of alkaline earth metals.

(a)

Both assertion and reason are true and reason is the correct explanation for assertion

(b)

Both assertion and reason are true but reason is not the correct explanation for assertion

(c)

Assertion is true but reason are false

(d)

Both assertion and reason are false.

6. Which metal is used in photoengrave plates in printing industry?

(a)

Co

(b)

Pt

(c)

Zn

(d)

Mg

7. Which mixture of gases at room temperature does not obey Dalton's law of partial pressure?

(a)

NO2 and O2

(b)

SO2 and SO3

(c)

CO and CO2

(d)

NH3 and HCI

8. % efficiency can be calculated using the formula

(a)

$\frac { output }{ input }$

(b)

$\frac { input }{ output } \times 100$

(c)

$\frac { input }{ output }$

(d)

$\frac { output }{ input } \times 100$

9. The standard value of enthalpy of combustion of benzoic acid is ______

(a)

-3227 kJ mol-1

(b)

+3227 kJ mol-1

(c)

-32-27 kJ mol-1

(d)

+32.27 kJ mol-1

10. The molecule that has linear structure is

(a)

CO2

(b)

NO2

(c)

SO2

(d)

SiO2

11. Which one of the following has linear shape?

(a)

I3-

(b)

ICI4-

(c)

BrF5

(d)

IOF5

12. Which one of the following names does not fit a real name?

(a)

3 – Methyl –3–hexanone

(b)

4–Methyl –3– hexanone

(c)

3– Methyl –3– hexanol

(d)

2– Methyl cyclo hexanone

13. The hybridisations of central and terminal carbon atoms in  are respectively.

(a)

sp and sp

(b)

sp2 and sp3

(c)

sp and sp2

(d)

sp2 and sp

14. The number of chain isomers possible in C5 HI2 is

(a)

2

(b)

3

(c)

4

(d)

5

15. Which structure is named as 3-chlorocyclobut-1-ene?

(a)

(b)

(c)

(d)

16. Which one of the following is called ferric ferrocyanide?

(a)

Na4[Fe(CN)6]

(b)

Na4[Fe(CN)6]3

(c)

Fe4[Fe(CN)6]

(d)

Fe4[Fe(CN)6]3

17. In -NO2, -NH2,-SO3H, the decreasing order of I II III -I effect is

(a)

I > II > III

(b)

I > III > II

(c)

III > II > I

(d)

III > I > II

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

(a)

-SH

(b)

-SR

(c)

-NH2

(d)

-NO2

19. The best reagent for converting an alcohol into the corresponding chloride is

(a)

PCl3

(b)

PCl5

(c)

SOCl2

(d)

HCl/ZnCl2​​​​​​​

20. Statement I : Primary alkyl halides on oxidation with DMSO gives aldehydes.
Statement II : DMSO is used as polar aprotic solvent.

(a)

Both. statement I and statement II are true individually and statement II explains statement

(b)

Both statement I and statement II are true individually but statement II does not explain statement 1.

(c)

Only statement Iis true, but statement II is false.

(d)

Both statement I and II are false

21. How does dizzonium salt (C6H5N2+Cl-) decompose?

(a)

C6HSCI+N2

(b)

C6H5Br + N2

(c)

only b

(d)

both a& b

22. Oxidation of C6H5CH2CI gwith alk, KMnO4 gives

(a)

C6H3CHO

(b)

C6H5COOH

(c)

C6H5CH2OH

(d)

C6H5CH3

23. Which of the following mechanism is followed in the halogenation of alkanes in the presence of U-V light?

(a)

Nucleophilic substitution

(b)

Electrophilic addition

(c)

Free radical substitution

(d)

Elimination reaction

24. Which of the following pair functional groups represents ambident nucleophiles?

(a)

-SH & - OH

(b)

CN & -NO2

(c)

-Br & -Cl

(d)

-O- &-CHO

25. Which one of the following is a gem-dihalide?

(a)

CH3CHCl2

(b)

$\underset { \overset { | }{ Cl } }{ CH_2 } -\underset { \overset { | }{ Cl } }{ CH_2 }$

(c)

CH3 - CH2CI

(d)

C6H4Cl2