#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Six

11th Standard

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Chemistry

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

25 x 1 = 25
1. The equivalent mass of a trivalent metal element is 9 g eq-1 the molar mass of its anhydrous oxide is

(a)

102 g

(b)

27 g

(c)

270 g

(d)

78 g

2. Match list I with list II and identify the correct code.

List I List II
A Bronze 1 Element
B Table Salt 2 Homogeneous mixture
C Gold 3 Alloy
D Petrol 4 Compound
(a)
 A B C D 1 4 2 3
(b)
 A B C D 3 4 1 2
(c)
 A B C D 2 3 4 1
(d)
 A B C D 4 2 3 1
3. One 'U' stands for the mass of

(a)

An atom of carbon-12

(b)

1/12th of the carbon-12

(c)

1/12th of a hydrogen atom

(d)

One atom of any of the element

4. How many moles of magnesium phosphate Mg3(PO4)2 Will Contain 0.25 moles of oxygen atoms?

(a)

0.02

(b)

3.125 x 10-2

(c)

1.25 x 10-2

(d)

2.5 x 10-2

5. How many electrons in an atom with atomic number 105 can have (n + I) = 8 ?

(a)

30

(b)

17

(c)

15

(d)

unpredictable

6. Name the element whose isotope has mass number 14 and 8 neutrons.

(a)

Carbon

(b)

Nitrogen

(c)

Oxygen

(d)

Fluorine

7. Assertion (A): Copper (Z = 29) with electronic configuration [Ar] 4s1 3d10 is more stable than [Ar] 4s2 3d9.
Reason (R): Copper with [Ar] 4s1 3d10 is more stable due to symmetrical distribution and exchange energies of d electrons.

(a)

A and R are correct and R is the correct explanation of A.

(b)

A and R are correct but R is not the correct explanation of A.

(c)

A is correct but R is wrong.

(d)

A is wrong but R is correct.

8. The statement that is not correct for modern classification of element is
(1) The properties of elements are periodic function of these atomic numbers.
(2) The ionisation enthalpy of the elements generally increase with increase in atomic number
(3) For transition elements the 3d orbitals are filled after 3p-orbitals and befire 4s orbitals.
(4) Fifth period contain 18 elements.

(a)

1 and 2

(b)

2 and 3

(c)

4 only

(d)

3 only

9. Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are

(a)

metalliods

(b)

transition elements

(c)

non-metals

(d)

gases

10. Elements whose atoms have their sand p-sub-levels complete are the _____

(a)

Normal elements

(b)

Transition elements

(c)

Halogens

(d)

Inert gases

11. Match the list-I and list-II using the correct code given below the list.

 List-I List-II A. Li 1. 2,8,8,1 B. Na 2. 2,1 C. K 3. 2,8,18,18,8,1 D. Cs 4. 2,8,1
(a)
 A B C D 3 4 1 2
(b)
 A B C D 2 4 1 3
(c)
 A B C D 1 3 2 4
(d)
 A B C D 4 2 1 3
12. 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)

13. Consider the following statements.
(i) Atomic radius of elements increases with increase in atomic number as we go down the group.
(ii) Atomic radius of elements increases with increase in atomic number as we go across the period.
(iii) Atomic radius of elements decreases as we go 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) only

(d)

(i) and (iii)

14. Which of the following orders of ionic radii is correct?

(a)

H- > H+ > H

(b)

Na+ > F- > O2-

(c)

F > O2- > Na+

(d)

None of these

15. Find the wrong statement

(a)

sodium metal is used in organic qualitative analysis

(b)

sodium carbonate is soluble in water and it is used in inorganic qualitative analysis

(c)

potassium carbonate can be prepared by solvay process

(d)

potassium bicarbonate is acidic salt

16. Which among the following is not a state function?

(a)

Pressure

(b)

Volume

(c)

Temperature

(d)

Work

17. Heat of combustion of methane is ------- KJ/mol.

(a)

-87.78

(b)

+87.78

(c)

-394.55

(d)

+394.55

18. Which of the following does not result in an increase in the entropy?

(a)

crystallisation of sucrose from solution

(b)

rusting of iron

(c)

conversion of ice to water

(d)

Vapourisation of camphor

19. Calculate the entropy change ofa process H2O(l) $\rightarrow$H2O(g) at 373K. Enthalpy ofvapourization of water is 40850 J Mole-1.

(a)

120 J K-1 mol-1

(b)

9.1 x 10-3 J K-1 mol-1

(c)

9.1 x 10-4 J K-1 mol-1

(d)

109.52 J K-1 mol-1

20. Consider the following equilibrium reaction and relate their equilibrium constants ________.
(i) N2 + O2 ⇌ 2NO; K1
(ii) 2NO + O2 ⇌ 2NO2; K2
(iii) N2 + 2O2 ⇌ 2NO2; K3

(a)

K3xK2=K1

(b)

K1xK3=K2

(c)

K1xK2=K3

(d)

$\frac{K_1}{K_2}=K_3$

21. When a saturated solution of KCl is heated it becomes

(a)

unsaturated

(b)

supersaturated

(c)

remains saturated

(d)

attains equilibrium

22. Bond order of a species is 2.5 and the number of electons in its bonding molecular orbital is formd to be 8 The no. of electons in its antibonding molecular orbital

(a)

three

(b)

four

(c)

Zero

(d)

cannot be calculated form the given unformation

23. Which is the correct lewis structure of BF3?

(a)

(b)

(c)

(d)

24. Principle behind crystallization is

(a)

solubility difference

(b)

boiling point difference

(c)

refractive index difference

(d)

difference in vapour pressure

25. Assertion (A) : addition of HCN in alkene is a type of electrophilic substitution reaction.
Reason (R) : in first step,H3O+ attacks on double bond.

(a)

Both A and R are true and R is the correct explanation of A.

(b)

Both A. and R are true but R is not the correct explanation of A.

(c)

A is true but R is false.

(d)

Both A and R are false.