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

11th Standard

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Chemistry

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

Answer all the questions

25 x 1 = 25
1. If the energy of an electron in the second Bohr orbit of H-atom is -E, what is the energy of the electron in the Bohr's first orbit?

(a)

2E

(b)

-4E

(c)

-2E

(d)

4E

2. Match the list I with List II and select the correct answer using. the code given below the lists.

 List I List II A.Element with first highest ionization enthalpy 1.Fluorine B.Element with second highest ionization enthalpy 2.Chlorine C.Element with highest  electron gain enthalpy 3.Sodium D.Element with highest electronegativity 4.Neon
(a)
 A B C D 1 3 2 4
(b)
 A B C D 4 3 2 1
(c)
 A B C D 3 1 4 2
(d)
 A B C D 2 1 4 3
3. The number of d- electrons in Fe+2 (Z = 26) is not equal to the number of electrons in which one of the following?

(a)

d-electron in Fe (Z = 26)

(b)

p-electron in Ne (Z = 10)

(c)

s-electron in Mg (Z = 12)

(d)

p-electron in CI (Z = 17)

4. Which one of the following is called halogen family?

(a)

Group 17

(b)

Group 16

(c)

Group 1

(d)

Group 2

5. 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)

6. Which of the following is not a metalloid (or) semi-metal?

(a)

Silicon

(b)

Arsenic

(c)

Germanium

(d)

Sodium

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

(a)

Al3+

(b)

N3-

(c)

Mg2+

(d)

K+

8. Among the alkali metals which one form compounds with more covalent character?

(a)

Sodium

(b)

Potassium

(c)

Rubidium

(d)

Lithium

9. Choose the correct statement with regard to ortho and para hydrogen.
1. Both have similar chemical properties but differ in.some physical properties.
2. The boiling points of normal, ortho and para hydrogens are the same.
3. The nuclear spin in both forms are the same.
4. Para hydrogen has zero magnetic moment.

(a)

1,2

(b)

1,4

(c)

2, 3

(d)

2, 4

10. Consider the reactions:
(i) H2O2 + 2HI $\rightarrow$ 12+ 2H2O
(ii) HOCI + H2O2 $\rightarrow$ H3O++ CI- + O2
Which of the following statements is correct about H2O2 with reference to the above reactions?

(a)

an oxidising agent in both (i) and (ii)

(b)

an oxidising agent in (i) and reducing agent in (ii)

(c)

a reducing agent in (i) and oxidising agent in (ii)

(d)

a reducing agent in both (i) and (ii)

11. The reagent used for softening of the temporary hardness of water is/are
(i) Ca3 (PO4)2     (ii) Ca(OH)2          (iii) Na2CO3    (iv) NaOCI

(a)

(ii) and (iii)

(b)

(i) and (iii)

(c)

(ii) and (iv)

(d)

(i) and (iv)

12. Consider the following statements.
(i) In ortho form of hydrogen molecule, the nuclear spins are opposed to each other.
(ii) The magnetic moment of para hydrogen is twice that of ortho hydrogen.
(iii) By passing an electric discharge, para hydrogen can be converted into ortho hydrogen.
Which of the above statement is/are not correct?

(a)

(i) only

(b)

(iii) only

(c)

(i) and (ii)

(d)

(ii) and (iii)

13. Which of the following is produced by bombardment of neutrons with lithium?

(a)

Deuterium

(b)

Protium

(c)

Tritium

(d)

Beryllium

14. Which set of the metals do not have any effect on water?

(a)

Ag, Au, Pt

(b)

Na, Mg, Al

(c)

Fe, Ca, Zn

(d)

Fe, Pb, Na

15. Find out the correct statement with respect to alkali metals.

(a)

They react with oxygen to give mainly the oxide MO2

(b)

They react with halogen to give halides MX

(c)

Their nitrates decompose on heating to give NO2 and O2

(d)

Their carbonates decompose on heating to give CO2 and MO

16. _________ is the cofactor of all enzymes that utilize ATP in phosphate transfer and energy release.

(a)

Be

(b)

Mg

(c)

Ca

(d)

Ba

17. Rock salt is major source of ________

(a)

lithium

(b)

potassium

(c)

francium

(d)

sodium

18. Consider the following statements.
(i) Alkali metals exhibit high chemical reactivity due to their low ionization energy.
(ii) Lithium is a very soft metal and even it can be cut with a knife.
(iii) Francium is a radioactive element in group 1 elements
Which of the above statements is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(i) and (iii)

(d)

(i), (ii) and (iii)

19. Which one of the following alkali metals is highly reactive with water?

(a)

Li

(b)

Cs

(c)

Rb

(d)

K

20. Among the following, which is the fifth most abundant element?

(a)

Beryllium

(b)

Barium

(c)

(d)

Calcium

21. Consider the following statements.
(i) Beryllium has small size and high polarizing power.
(ii) Beryllium does not have d-orbitals in its valence shell.
(iii) Beryllium has low electronegativity and very low ionization enthalpy as compared to other alkaline earth metals.
Which of the above statements is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(iii) only

(d)

(i) and (ii)

22. Which one of the following is used as a desulphurising agent for iron and steel?

(a)

Cd

(b)

Mg

(c)

Zn

(d)

Be

23. In a closed room of 1000 m3 a perfume bottle is opened up. The room develops smell. This is due to which property of gases

(a)

Viscosity

(b)

Density

(c)

Diffusion

(d)

None

24. An ideal gas expands from the volume of 1 x 10-3 m3 to 1 x 10-2 m3 at 300 K against a constant pressure at 1 x 105 Nm-2. The work done is

(a)

- 900 J

(b)

900 kJ

(c)

270 kJ

(d)

-900 kJ

25. Which of the following compounds shall not produce propene by reaction with HBr followed by elemination (or) only direct elimination reaction

(a)

(b)

CH3 – CH2 – CH2 – OH

(c)

H2C = C = 0

(d)

CH3 – CH2 – CH2Br