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

11th Standard

Reg.No. :
•
•
•
•
•
•

Chemistry

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

Answer all the questions

25 x 1 = 25
1. Which one of the following is the standard for atomic mass?

(a)

1H1

(b)

6C12

(c)

6C14

(d)

8O16

2. Consider the following statements
1.$\lambda$ .= h / mv is valid only when the particle travels at speed much less than the speed of light.
2. Einstein's mass-energy relationship is E=mc2
3. The angular momentum (mvr) ofthe electron must be equal to an integral multiple of h/4$\pi$ . Which of the following statementts) given above is/ are correct?

(a)

1&3

(b)

Only 1

(c)

1 & 2

(d)

1, 2 & 3

3. Assertion: Helium has the highest value of ionization energy among all the elements known
Reason: Helium has the highest value of electron affinity among all the elements known

(a)

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

(b)

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

(c)

Assertion is true and the reason is false

(d)

Both assertion and the reason are false

4. Which of the following statements are correct?
(i) Helium has the highest first ionisation enthalpy
(ii) Chlorine has less electron affinity than fluorine
(iii) Ne has more ionisation energy than Boron.
(iv) The ionisation energy noble gases of zero

(a)

(i), (ii) and (iii)

(b)

(i) and (iii)

(c)

(i), (iii) and (iv)

(d)

(i), (ii), (iii) and (iv)

5. Which one of the following is the first transition series?

(a)

Sc

(b)

Zn

(c)

Ti

(d)

Cu

6. Consider the following statements.
(i) Oxidation character increases from left to right in a period.
(ii) Reducing character increases from left to right in a period.
(iii) Metallic character increases from left to right in a period.
Which of the above statement is/are not correct?

(a)

(i) only

(b)

(i) and (ii)

(c)

(ii) and (iii)

(d)

(i),(ii),(iii)

7. Which one of the following is in solid state at room temperature?

(a)

Bromine

(b)

Mercury

(c)

Bismuth

(d)

Gallium

8. Which one of the following is not an isoelectronic ion?

(a)

Na+

(b)

Mg2+

(c)

Cl-

(d)

O2-

9. Which of the following have the highest value of electronegativity?

(a)

Halogens

(b)

Alkali metals

(c)

Alkaline earth metals

(d)

Transition metals

10. Which of the following statements related to the modern periodic table is incorrect?

(a)

The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-subshell.

(b)

The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.

(c)

Each block contairis a number of columns equal to the number of electrons that can occupy that subshell.

(d)

The block indicates value of azimuthal quantum number (1) for the last subshell that received electrons in building up the electronic configuration.

11. Which of the following is arranged in order of increasing radius?

(a)

K+ (aq) < Na+ (aq) < Li+ (aq)

(b)

K+ (aq) > Na+ (aq) > Zn+ (aq)

(c)

K+ (aq) > Li+ (aq) > Na+ (aq)

(d)

Li+ (aq) < Na+ (aq) < K+ (aq)

12. The first ionization enthalpy of Na, Mg, AI and Si are in order.

(a)

Na<Mg<AI>Si

(b)

Na>Mg>AI>Si

(c)

Na<Mg<Al<Si

(d)

Na>Mg>Al<Si

13. H2O2 is a ________ acid.

(a)

mono basic

(b)

di basic

(c)

tri basic

(d)

none

14. The reaction H2O2 ➝ H2O+O2 represents,

(a)

Oxidation of H2O2

(b)

reduction of H2O

(c)

disproponation of oxygen

(d)

acidic nature of H2O2

15. The element which does not contain a neutron is

(a)

hydrogen

(b)

helium

(c)

chlorine

(d)

none of the above

16. CO2 + K2CO3 + H2O $\rightarrow$ X. The product X is:

(a)

KHCO3

(b)

CO2

(c)

H2CO3

(d)

KOH

17. When sodium peroxide is treated with dilute sulphuric acid.the products are

(a)

sodium sulphate and water

(b)

sodium sulphate and oxygen

(c)

sodium sulphate, hydrogen and oxygen

(d)

sodium sulphate and hydrogen peroxide

18. Which one of the following element mostly present in the sun and the stars?

(a)

Hydrogen

(b)

Lithium

(c)

Helium

(d)

Beryllium

19. Which one of the following does not have intramolecular hydrogen bonding?

(a)

water

(b)

o-nitrophenol

(c)

Salicylaldehyde

(d)

Salicylic acid

20. Which of the following is named as perhydrol and used as an antiseptic?

(a)

D2O

(b)

H2O2

(c)

NaH

(d)

B2H6

21. The general electronic configuration of alkali metals is ____________

(a)

[noble gas] ns2

(b)

[noble gas] ns1

(c)

ns2 np6

(d)

ns2 (n-1)d1-10

22. According to VSEPR theory, the repulsion between different parts of electrons obey the order.

(a)

l.p – l.p > b.p–b.p> l.p–b.p

(b)

b.p–b.p> b.p–l.p> l.p–b.p

(c)

l.p–l.p> b.p–l.p > b.p–b.p

(d)

b.p–b.p> l.p–l.p> b.p–l.p

23. The IUPAC name of the compound CH– CH = CH – C ≡ CH is

(a)

Pent - 4 - yn-2-ene

(b)

Pent -3-en-l-yne

(c)

pent – 2– en – 4 – yne

(d)

Pent – 1 – yn –3 –ene

24. Ortho and para-nitro phenol can be separated by

(a)

azeotropic distillation

(b)

destructive distillation

(c)

steam distillation

(d)

cannot be separated

25. The most easily hydrolysed molecule under SN1 condition is

(a)

allyl chloride

(b)

ethyl chloride

(c)

ispropylchloride

(d)

benzyl chloride