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Important 1mark -chapter 9,10

Published on: 30/09/2018

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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Questions:

Multiple Choice Question

28 x 1 = 28

The percentage of s-character of the hybrid orbitals in methane, ethane, ethene and ethyne are respectively ___________

(a)

25, 25, 33, 3, 50

(b)

50, 50, 33, 3, 25

(c)

50, 25, 33, 3, 50

(d)

50, 25, 25, 50

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)

(b)

(c)

U/2

(d)

Among the following, the compound that contains, ionic, covalent and Coordinate linkage is ____________

(a)

NH₄Cl

(b)

NH₃

(c)

NaCl

(d)

none of these

Which of the following conditions is not correct for resonating structures?

(a)

the contributing structure must have the same number of unpaired electrons

(b)

the contributing structures should have similar energies

(c)

the resonance hybrid should have higher energy than any of the contributing structure

(d)

none of these

Shape of ClF₃ is _____________

(a)

Planar triangular

(b)

Pyramidal

(c)

'T' Shaped

(d)

none of these

Xe F₂ is isostructural with _____________

(a)

SbCl₂

(b)

BaCl₂

(c)

TeF₂

(d)

ICI₂^-

Some of the following properties of two species, NO₃^- and H₃O⁺ are described below. which one of them is correct?

(a)

dissimilar in hybridisation for the central atom with different structure

(b)

isostructural with same hybridisation for the Central atom

(c)

different hybridiration for the central atom with same structure

(d)

none of these

In which of the following molecules /ions BF₃, NO₂^-, H₂O the central atom is sp² hybridised?

(a)

NH₂^- and H₂O

(b)

NO₂^- and H₂O

(c)

BF₃ and NO₂^-

(d)

BF₃ and NH₂^-

Pick out the incorrect statement from the following.

(a)

Sp³ hybrid orbitals are equivalent and are at an angle of 109^o 28' with each other

(b)

dsp² hybrid orbitals are equivalent and bond angle between any two of them is 90^o

(c)

All five sp³d hybrid orbitals are not equivalent out of these five sp³d hybrid orbitals, three are at an angle of 120^o, remainir two are perpendicular to the plane containing the other three

(d)

none of these

10.

Shape and hybridisation of IF₅ are ________

(a)

Trigonal bipyramidal, Sp³d²

(b)

Trigonal bipyramidal, Sp³d

(c)

Square pyramidal, Sp³d²

(d)

Octahedral, Sp³d²

11.

Hybridisation of central atom in PCl₅involves the mixing of orbitals __________

(a)

s, p_x, p_y, d_x2 , d_x²-y²

(b)

s, p_x . p_y, p_xy . d_x²-y²

(c)

s, p_x, p_y, p_z, d_x²-y²

(d)

s, p_x, p_y, d_xy, d_x²-y²

12.

Which of these represents the correct order of their increasing bond order _________

(a)

C₂ < C₂ ^2- < O₂ ^2-< O₂

(b)

C₂ ^2- < C₂ ⁺ < O₂< O₂ ^2-

(c)

O₂ ^2- < O₂< C₂ ^2- < C ²⁺

(d)

O₂ ^2- < C₂ ⁺< O₂< C₂ ^2-

13.

In ClF₃, NF₃ and BF₃ molecules the chlorine, nitrogen and boron atoms are ______

(a)

sp³ hybridised

(b)

sp³ ,sp³ and sp² respectively

(c)

sp² hybridised

(d)

sp³d, sp³ and sp hybridised respectively

14.

In the molecule O_A= C = O_B, the formal charge on O_A, C and O_B are respectively.

(a)

-1, 0, +1

(b)

+1, 0, -1

(c)

-2, 0, +2

(d)

0, 0, 0

15.

Phenol dimerises in benzene having van't Hoff factor 0.54. What is the degree of association ?

(a)

0.46

(b)

(c)

(d)

0.92

16.

Which of the following aqueous solutions has the highest boiling point ?

(a)

0.1 M KNO₃

(b)

0.1 M Na₃PO₄

(c)

0.1 BaCl₂

(d)

0.1 M K₂SO₄

17.

The Van't Hoff factor (i) for a dilute aqueous solution of the strong elecrolyte barium hydroxide is _____________

(a)

(b)

(c)

(d)

18.

The mass of a non-voltaile solute (molar mass 80 g mol^–1) which should be dissolved in 92g of toluene to reduce its vapour pressure to 90% ______________

(a)

10g

(b)

20g

(c)

9.2g

(d)

8.89g

19.

Two liquids X and Y on mixing gives a warm solution. The solution is __________

(a)

ideal

(b)

non-ideal and shows positive deviation from Raoults law

(c)

ideal and shows negative deviation from Raoults Law

(d)

non-ideal and shows negative deviation from Raoults Law

20.

The empirical formula of a nonelectrolyte(X) is CH₂O. A solution containing six gram of X exerts the same osmotic pressure as that of 0.025 M glucose solution at the same temperature. The molecular formula of X is ____________

(a)

C₂H₄O₂

(b)

C₈H₁₆O₈

(c)

C₄H₈O₄

(d)

CH₂O

21.

The Henry's law constants for two gases A and B are x and y respectively. The ratio of mole fractions of A to B is 0.2. The ratio of mole fraction of B and A dissolved in water will be _________

(a)

\({2x\over y}\)

(b)

\({y\over 0.2x}\)

(c)

\({0.2x\over y}\)

(d)

\({5x\over y}\)

22.

Which one of the following binary liquid mixtures exhibits positive deviation from Raoults law ?

(a)

Acetone + chloroform

(b)

Water + nitric acid

(c)

HCl + water

(d)

ethanol + water

23.

Osometic pressure (p) of a solution is given by the relation ____________

(a)

= nRT

(b)

V = nRT

(c)

\(\pi\)RT = n

(d)

none of these

24.

P₁ and P₂ are the vapour pressures of pure liquid components, 1 and 2 respectively of an ideal binary solution if x₁ represents the mole fraction of component 1, the total pressure of the solution formed by 1 and 2 will be ____________

(a)

P₁ + x₁ (P₂ – P₁)

(b)

P₂ – x₁ (P₂ + P₁)

(c)

P₁ – x₂ (P₁ – P₂)

(d)

P₁ + x₂ (P₁ – P₂)

25.

Which one of the following gases has the lowest value of Henry's law constant ?

(a)

N₂

(b)

(c)

CO₂

(d)

H₂

26.

Which one of the following is incorrect for ideal solution ?

(a)

\(\Delta H_{mix}=0\)

(b)

\(\Delta U_{mix}=0\)

(c)

\(\Delta P=P_{observed}-P_{calculated\ by\ raoults\ law}=0\)

(d)

\(\Delta G_{mix}=0\)

27.

The partial pressure of nitrogen in air is 0.76 atm and its Henry's law constant is 7.6 x 10⁴ atm at 300K. What is the mole fraction of nitrogen gas in the solution obtained when air is bubbled through water at 300K ?

(a)

1 x 10^-4

(b)

1 x 10^-6

(c)

2 x 10^-5

(d)

1 x 10^-5

28.

Stomach acid, a dilute solution of HCl can be neutralised by reaction with Aluminium hydroxide
Al (OH)₃ + 3HCl (aq) → AlCl₃ + 3 H₂O
How many millilitres of 0.1 M Al(OH)₃ solution are needed to neutralise 21 mL of 0.1 M HCl ?

(a)

14 mL

(b)

7 mL

(c)

21 mL

(d)

none of these

Assertion and reason

2 x 2 = 4

29.

Assertion: Oxygen molecule is paramagnetic.
Reason: It has two unpaired electron in its bonding molecular orbital.
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) Both assertion and reason are false

(a)

both assertion and reason are true and reason is the correct explanation of assertion

(b)

both assertion and reason are true but reason is not the correct explanation of assertion

(c)

assertion is true but reason is false

(d)

Both assertion and reason are false

30.

Assertion: An ideal solution obeys Raoults Law
Reason: In an ideal solution, solvent-solvent, as well as solute-solute interactions, are similar to solute-solvent interactions.
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false

(a)

both assertion and reason are true and reason is the correct explanation of assertion

(b)

both assertion and reason are true but reason is not the correct explanation of assertion

(c)

assertion is true but reason is false

(d)

both assertion and reason are false

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Answers Key:

Multiple Choice Question

28 x 1 = 28

(a)
25, 25, 33, 3, 50

(d)
4U

(a)
NH₄Cl

(d)
ICI₂^-

(a)
dissimilar in hybridisation for the central atom with different structure

(c)
All five sp³d hybrid orbitals are not equivalent out of these five sp³d hybrid orbitals, three are at an angle of 120^o, remainir two are perpendicular to the plane containing the other three

10.

11.

12.