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12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Six

Published on: 13/10/2020

Download Tamil Nadu 12th 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: 12th Standard - Chemistry

chapter: - Model Question paper

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Questions:

Multiple Choice Question

25 x 1 = 25

An example for 1 : 1 electrolyte is ______.

(a)

H₂SO₄

(b)

Na₂SO₄

(c)

NaCI

(d)

Al₂(SO₄)₃

An example of lyophilic colloid is________.

(a)

sulphur in water

(b)

phosphorus in water

(c)

starch

(d)

all of these

For two acids A and B, K_a values at 25°C are 2 x 10⁶ and 1.8 x 10^-4 respectively. which among the following is true with respect to the above data _______.

(a)

A and B are equally acidic

(b)

A is stronger than B

(c)

B is stronger than A

(d)

K_avalue is not a measure of acid strength

Complete the reaction

(a)

(b)

(c)

(d)

none

It has no α- hydrogen ______.

(a)

CH₃CH₂OH

(b)

CH₃- CH₂- CH₂- OH

(c)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -OH\)

(d)

The process of removing ions from a sol by diffusion through a permeable membrane is called _______.

(a)

Ultra filtration

(b)

Dialysis

(c)

Eletrophoresis

(d)

Cataphoresis

Which of the following interface cannot be obtained?

(a)

solid - solid

(b)

solid - liquid

(c)

gas - gas

(d)

liquid -Iiquid

Which of the following are epimers?

(a)

D(+)-Glucose and D(+)-Galactose

(b)

D(+)-Glucose and D(+)-Mannose

(c)

Neither (a) nor (b)

(d)

Both (a) and (b)

The major product of the following reaction

(a)

(b)

(c)

(d)

10.

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

(a)

(b)

(c)

(d)

11.

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below
(I) (NaCl) = 52
(II) ((BaCl₂) = 0.69
(III) (MgSO₄) = 0.22
The correct order of their coagulating power is ________.

(a)

III > II > I

(b)

I > II > III

(c)

I > III > II

(d)

II > III > I

12.

Which of the following electrolytic solution has the least specific conductance?

(a)

(b)

0.002N

(c)

0.02N

(d)

0.2N

13.

MY and NY₃, are insoluble salts and have the same K_sp values of 6.2 × 10^-13 at room temperature. Which statement would be true with regard to MY and NY₃?

(a)

The salts MY and NY₃ are more soluble in 0.5M KY than in pure water

(b)

The addition of the salt of KY to the suspension of MY and NY₃ will have no effect on their solubility’s

(c)

The molar solubility of MY and NY₃in water are identical

(d)

The molar solubility of MY in water is less than that of NY₃

14.

Which of the following statement is not correct?

(a)

Molecularity of a reaction cannot be fractional

(b)

Molecularity of a reaction cannot be more than three

(c)

Molecularity of a reaction can be zero

(d)

Molecularity is assigned for each elementary step of mechanism.

15.

Graphite is a good conductor of electricity due to the presence of_______.

(a)

Lone pair of electrons

(b)

Free valence electrons

(c)

Cations

(d)

Anions

16.

Silicones are ______.

(a)

ortho silicates

(b)

water repellent thermal insulators

(c)

both (a) and (b)

(d)

None of these

17.

_________ is known as Bayer's reagent.

(a)

Hot dilute alkaline KMnO₄

(b)

Cold dilute alkaline KMnO₄

(c)

Hot Conc. acidic KMnO₄

(d)

Cold Conc. acidic KMnO₄

18.

In Hall-Heroult process ___________act as an anode.

(a)

Carbon blocks

(b)

hydrogen

(c)

copper rods

(d)

Zinc rods

19.

The oxidation state of the central metal ion in the complex [Co(H₂O)(CN)(en)₂]²⁺ is________.

(a)

(b)

(c)

(d)

20.

The correct difference between first and second order reactions is that________.

(a)

A first order reaction can be catalysed; a second order reaction cannot be catalysed.

(b)

The half life of a first order reaction does not depend on [A₀]; the half life of a second order reaction does depend on [A₀].

(c)

The rate of a first order reaction does not depend on reactant concentrations; the rate of a second order reaction does depend on reactant concentrations.

(d)

The rate of a first order reaction does depend on reactant concentrations; the rate of a second order reaction does not depend on reactant concentrations.

21.

A two dimensional solid pattern formed by two different atoms X and Y is shown below. The black and white squares represent atoms X and Y respectively. The simplest formula for the compound based on the unit cell from the pattern is _______.

(a)

XY₈

(b)

X₄Y₉

(c)

XY₂

(d)

XY₄

22.

Choose the correct statement.

(a)

Square planar complexes are more stable than octahedral complexes

(b)

The spin only magnetic moment of [Cu(Cl)₄]^2- is BM and it has square planar structure.

(c)

Crystal field splitting energy \(\left( { \Delta }_{ 0 } \right) \) [FeF₆]^4- is higher than the \((\Delta _{ 0 })\) of [Fe(CN)₆]^4-

(d)

crystal field stabilization energy of [V(H₂O)₆]²⁺ is higher than the crystal field stabilization of [Ti(H₂O)₆]²⁺

23.

Which one of the following is not correct?

(a)

La(OH)₃ is less basic than Lu(OH)₃

(b)

In lanthanoid series ionic radius of Ln³⁺ ions decreases

(c)

La is actually an element of transition metal series rather than lanthanide series

(d)

Atomic radii of Zr and Hf are same because of lanthanide contract

24.

An element belongs to group 15 and 3^rdperiod of the periodic table, its electronic configuration would be_______.

(a)

1s² 2s² 2p⁴

(b)

1s² 2s² 2p³

(c)

1s² 2s² 2p⁶ 3s² 3p²

(d)

1s² 2s² 2p⁶ 3s² 3p³

25.

The incorrect statement among the following is______.

(a)

Nickel is refined by Mond’s process

(b)

Titanium is refined by Van Arkel’s process

(c)

Zinc blende is concentrated by froth floatation

(d)

In the metallurgy of gold, the metal is leached with dilute sodium chloride solution

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Answers Key:

Multiple Choice Question

25 x 1 = 25

(b)
A is stronger than B

(b)
Dialysis

(d)
Both (a) and (b)

10.

11.

coagulating power ∝ 1/coagulation value

12.

In general, specific conductance of an electrolyte decreases with dilution.So,0.002N solution has least specific conductance.

13.

Addition of salt KY (having a common ion Y^-) decreases the solubility of MY and NY₃ due to common ion effect.
Option (a) and (b) are wrong
For salt MY, MY ⇌ M⁺ + Y^-
K_sp = (s) (s)
6.2 × 10^-13 = s²
\(\therefore\) s = \(\sqrt{6.2 \times 10^{-13}} = 10^{-7}\)
For salt NY₃,
NY₃⇌ N³⁺ + 3Y^-
K_sp = (s) (3s)³
K_sp = 27s⁴
\(s = (\frac{6.2 \times 10^{-13}}{27})^{1/4}\)
s = 10^-4
The molar solubility of MY in water is less than of NY₃

14.

15.

(b)
Free valence electrons

16.

17.

(b)
Cold dilute alkaline KMnO₄

18.

(a)
Carbon blocks

19.

(d)
+3

20.

\({ t }_{ 1/2 }=\frac { 0.6932 }{ k } \)
For a second order reaction
\(\mathrm{t}_{1 / 2}=\frac{2^{\mathrm{n}-1}-1}{(\mathrm{n}-1) \mathrm{k} \cdot\left[\mathrm{A}_{0}\right]^{\mathrm{n}-1}}\)
n = 2
\(\mathrm{t}_{1 / 2}=\frac{2^{\mathrm{2}-1}-1}{(\mathrm{n}-1) \mathrm{k} \cdot\left[\mathrm{A}_{0}\right]^{\mathrm{2}-1}}\)
\(\mathrm{t}_{1 / 2} =\frac{1}{ \mathrm{k}\left[\mathrm{A}_{0}\right]}\)

21.