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

Published on: 10/11/2020

Download Tamil Nadu 11th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 11th Standard - Chemistry

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Questions:

Multiple Choice Question

23 x 1 = 23

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

Which is the correct lewis structure of BF₃?

(a)

(b)

(c)

(d)

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)

\(\frac{K_1}{K_2}=K_3\)

Principle behind crystallization is __________

(a)

solubility difference

(b)

boiling point difference

(c)

refractive index difference

(d)

difference in vapour pressure

When a saturated solution of KCl is heated it becomes ____________

(a)

unsaturated

(b)

supersaturated

(c)

remains saturated

(d)

attains equilibrium

Which of the following orders of ionic radii is correct?

(a)

H^- > H⁺ > H

(b)

Na⁺ > F^- > O^2-

(c)

F > O^2- > Na⁺

(d)

None of these

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

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)

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)

10.

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

11.

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

12.

Heat of combustion of methane is____________ KJ/mol.

(a)

-87.78

(b)

+87.78

(c)

-394.55

(d)

+394.55

13.

Which among the following is not a state function?

(a)

Pressure

(b)

Volume

(c)

Temperature

(d)

Work

14.

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

15.

One 'U' stands for the mass of ______________.

(a)

An atom of carbon-12

(b)

1/12^th of the carbon-12

(c)

1/12th of a hydrogen atom

(d)

One atom of any of the element

16.

Elements whose atoms have their s and p-sub-levels complete are the _____

(a)

Normal elements

(b)

Transition elements

(c)

Halogens

(d)

Inert gases

17.

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

(a)

Carbon

(b)

Nitrogen

(c)

Oxygen

(d)

Fluorine

18.

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

(a)

metalloids

(b)

transition elements

(c)

non-metals

(d)

gases

19.

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

20.

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 before 4s orbitals.
(4) Fifth period contain 18 elements.

(a)

1 and 2

(b)

2 and 3

(c)

4 only

(d)

3 only

21.

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

22.

How many electrons in an atom with atomic number 105 can have (n + 1) = 8 ?

(a)

(b)

(c)

(d)

unpredictable

23.

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

Assertion and reason

2 x 2 = 4

24.

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.

(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.

25.

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.
Codes:
(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.