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

11th Standard

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Chemistry

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

Answer all the questions

25 x 1 = 25
1. 7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

(a)

NO

(b)

N2O

(c)

CO

(d)

CO2

2. Rusting of iron articles is an example of ___________ reaction

(a)

Combustion

(b)

decomposition

(c)

redox

(d)

hydrolysis

3. Which of the following is a mono-atomic molecule?

(a)

Hydrogen

(b)

Oxygen

(c)

Sodium

(d)

Ozone

4. The oxidation number of Cr in K2Cr2O7 is ___________.

(a)

+4

(b)

+6

(c)

0

(d)

+7

5. The number of nodes in s orbital of any energy level is equal to

(a)

n

(b)

2n2

(c)

n-1

(d)

n-2

6. Which of the following is the expected configuration of Cr (Z = 24)?

(a)

1s2 2s2 2p6 3s2 3p6 3d4 4s2

(b)

1s2 2s2 2p6 3s2 3p6 3d5 4s1

(c)

1s2 2s2 2p6 3s2 3p6 3d6

(d)

1s2 2s2 2p6 3s2 3p6 3d5 4s3

7. d-block elements form ____ compounds.

(a)

ionic

(b)

covalent

(c)

Coordinate

(d)

both (a) and (b)

8. In the following the element with the highest ionisation energy is

(a)

[Ne]3s23p1

(b)

[Ne]3s23p3

(c)

[Ne]3s23p2

(d)

[Ne]3s23p4

9. 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)

10. Which of the following possess almost same properties due to lanthanide contraction?

(a)

Zr,HF

(b)

Na,K

(c)

Zn,Cd

(d)

Ag,Au

11. Considering the elements F, CI, O and N, the correct order of their chemical reactivity in terms of oxidizing property is_____

(a)

F > CI > O > N

(b)

F > O > CI > N

(c)

CI > F > O > N

(d)

0 > F > N > CI

12. Consider the isoelectronic species Na+, Mg2+, F- and O2-. The correct order of increasing length of their radii is:

(a)

F- < O2- < Mg2+< Na+

(b)

Mg2+ < Na+ < F- < O2-

(c)

O2- < F- < Na+ < Mg2+

(d)

O2- < F- < Mg2+ < Na+

13. The element with highest electron affinity belongs to___________.

(a)

period 1 group 1

(b)

period 3 group 17

(c)

period 2 group 17

(d)

period 2 group 16

14. The number of neutrons in  hydrogen atom is ___________.

(a)

three

(b)

two

(c)

one

(d)

zero

15. Hydrogen is used in _________

(a)

hydrogenation of oils

(b)

fuel cells

(c)

gas bags for air ships

(d)

all the above

16. Hydrogen accepts an electron to attain the inert gas configuration. In this way it resembles __________

(a)

chalcogens

(b)

halogens

(c)

transition metals

(d)

alkali metals

17. The maximum density of water is observed at ___________

(a)

0oC

(b)

4oC

(c)

11.6oC

(d)

273oC

18. CaO and NaCl have the same crystal structure and approximately the same radii. It U is the lattice energy of NaCl, the approximate lattice energy of CaO is

(a)

U

(b)

2U

(c)

U/2

(d)

4U

19. The IUPAC name of  is

(a)

2 – Bromo -3 – methyl butanoic acid

(b)

2 - methyl - 3- bromobutanoic acid

(c)

3 - Bromo - 2 - methylbutanoic acid

(d)

3 - Bromo - 2, 3 - dimethyl propanoic acid

20. Homolytic fission of covalent bond leads to the formation of

(a)

electrophile

(b)

nucleophile

(c)

Carbo cation

(d)

free radical

21. The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are

(a)

CH4 and H2

(b)

CH4 and CO2

(c)

C2H6 and CO2

(d)

C2H4 and Cl2

22. Identify the compound 'Z' in the following reaction
${ C }_{ 2 }{ H }_{ 6 }O\overset { { Al }_{ 2 }{ O }_{ 3 } }{ \underset { 623\quad K }{ \longrightarrow } } X\overset { { O }_{ 3 } }{ \longrightarrow } Y\overset { Zn/{ H }_{ 2 }O }{ \longrightarrow } \left( Z \right)$

(a)

Formaldehyde

(b)

Acetaldehyde

(c)

Formic acid

(d)

none of these

23. In the reaction  X is ________.

(a)

(b)

(c)

(d)

24. Ethylidene chloride on treatment with aqueous KOH gives

(a)

acetaldehyde

(b)

ehtyleneglycol

(c)

formaldehyde

(d)

glycoxal

25. Assertion (A): Oxygen plays a key role in the troposphere
Reason (R): Troposphere is not responsible for all biological activities

(a)

Both (A) and R are correct and (R) is the correct explanation of (A)

(b)

Both (A) and R are correct and (R) is not the correct explanation of (A)

(c)

Both (A) and R are not correct

(d)

(A) is correct but( R) is not correct