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Alkali And Alkaline Earth Metals & Gaseous State Important One Mark Question Paper In 11th Chemistry

Published on: 30/09/2018

Important 1mark -chapter 5,6

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

47 x 1 = 47

In a closed flask of 5 litres, 1.0 g of H₂ is heated from 300 to 600 K, which statement is not correct?

(a)

pressure of the gas increases

(b)

the rate of the collusion increase

(c)

the number of moles of gas increases

(d)

the energy of gaseous molecules increases

Statement-I: Gases do not liquefy above their critical temperature, even on applying high pressure.
Statement-II: Above critical temperature, the molecular speed is high and intermolecular attractions cannot hold the molecules together because they escape because of high speed.

(a)

Statement-I and II are correct and Statement-II is the correct explanation of Statement-I

(b)

Statement-I and II are correct but Statement-Il is not the correct explanation of Statement-I

(c)

Statement-I is correct but Statement-Il is wrong

(d)

Statement-I is wrong but Statement-Il is correct

Statement-I: Cesium is considered as the most electropositive element.
Statement-Il: Due to its lowest ionization energy, cesium is considered as the most electropositive element.

(a)

Statements-I and II are correct and statement-II is the correct explanation of statement-I.

(b)

Statements- I and II are correct but statement-II is not the correct explanation of statement- I.

(c)

Statement-I is correct but statement-II is wrong.

(d)

Statement-I is wrong but statement-II is correct.

The value of critical pressure of CO₂ is ___________.

(a)

173 atm

(b)

73 atm

(c)

1 atm

(d)

22.4 atm

The value of critical volume is equal in terms of Vander Waals constant is ___________.

(a)

(b)

\(8a\over 27Rb\)

(c)

\(a\over 27b^2\)

(d)

\(2a\over Rb\)

\(\frac{P}{T}\) = Constant is known as __________

(a)

Boyle's law

(b)

Charles' law

(c)

Gay Lussac's law

(d)

Dalton's law

Which one of the following is absolute zero?

(a)

293 K

(b)

273 K

(c)

-273.15^o C

(d)

0^o C

Among the following, which is deadly poison?

(a)

CO₂

(b)

HCN

(c)

HCI

(d)

NH₃

Which one of the following is named as bleaching powder?

(a)

CaCI₂

(b)

CaOCI

(c)

Ca(OCl)₂

(d)

Ca(HCO₃)₂

10.

Correctly match the list-land list-II using the code given below the list.

List-I		List-II
A	Quick lime	1	Casts of statues
B	Calcium hydroxide	2	Drying agent
C	Gypsum	3	White washing
D	Plaster of paris	4	Tooth paste

(a)

A	B	C	D
2	3	4	1

(b)

A	B	C	D
3	4	1	2

(c)

A	B	C	D
1	3	2	4

(d)

A	B	C	D
4	1	3	2

11.

Correctly match the list-I and list-II using the code given below the list

List-I		List-II
A	Beryllium	1	Cement
B	Magnesium	2	Dating of rocks
C	Calcium	3	X-ray detector
D	Strontium	4	Missile construction

(a)

A	B	C	D
3	4	1	2

(b)

A	B	C	D
4	3	2	1

(c)

A	B	C	D
1	4	3	2

(d)

A	B	C	D
2	3	4	1

12.

Which is used in dehydrating oils?

(a)

Calcium

(b)

Magnesium

(c)

Beryllium

(d)

Radium

13.

In Van der Waals equation of state for a non-ideal gas the net force of attraction among the molecules is given by _____________.

(a)

\(\frac{an^2}{V^2}\)

(b)

\(P+\frac{an^2}{V^2}\)

(c)

\(P-\frac{an^2}{V^2}\)

(d)

\(-\frac{an^2}{V^2}\)

14.

In fire works, red colour flash is produced by ________

(a)

(b)

(c)

(d)

15.

Which of the following is insoluble in water?

(a)

LiF

(b)

NaCI

(c)

KBr

(d)

NaBr

16.

Which of the following is radioactive in group one elements?

(a)

Lithium

(b)

Caesium

(c)

Rubidium

(d)

Francium

17.

The isotherm obtained for CO is as follows:

The compressibility factor for the gas at point ' A' will be __________

(a)

\((1-\frac{b}{V})\)

(b)

\((1+\frac{b}{V})\)

(c)

\((1+\frac{b}{RT})\)

(d)

\((1+\frac{a}{RTV})\)

18.

Equal volumes of He, O₂ and SO₂ are taken in a closed container. The ratio of the partial pressures of gases He, O₂ and SO₂ would be __________

(a)

1 : 2 : 8

(b)

8 : 16 : 1

(c)

1 : 4 : 16

(d)

16 : 2 :1

19.

Which is insoluble in water?

(a)

CaF₂

(b)

CaCl2

(c)

HgCl₂

(d)

Ca(NO₃)₂

20.

By adding gypsum to cement ____________

(a)

setting time of cement becomes less

(b)

setting time Of cement increases

(c)

colour of cement becomes light

(d)

shining surface is obtained

21.

Which of the following statements is true about Ca(OH)₂?

(a)

It is used in the preparation of bleaching powder

(b)

It is a light blue solid

(c)

It is a light blue solid

(d)

It is used in the manufacture of cement

22.

Gypsum is _________

(a)

CaSO₄.H₂O

(b)

CaSO₄.1/2H₂O

(c)

CaSO₄.1/4H₂O

(d)

CaSO₄.2H₂O

23.

Name the alkaline earth metal hydroxide which is amphoteric in nature _________

(a)

Be(OH)₂

(b)

KOH

(c)

NaOH

(d)

All of these

24.

The liquefaction behaviour of temporary gases like CO₂ approaches that of N₂, O₂ (permanent gases) as we go _______

(a)

below critical temperature

(b)

above critical temperature

(c)

below absolute zero

(d)

above absolute zero

25.

________ occurs in large amounts in sea water

(a)

NaCl

(b)

KCl

(c)

both a and b

(d)

neither a nor b

26.

273K is equal to ______________ degree centigrade.

(a)

(b)

100

(c)

373

(d)

27.

The order of decreasing ionisation enthalpy in alkali metals is _____________

(a)

Na > Li > K > Rb

(b)

Rb < Na < K < Li

(c)

Li > Na > K > Rb

(d)

K < Li < Na < Rb

28.

The standard atmospheric pressure is the pressure that supports a column of mercury exactly ___________ high at 0° C at sea level.

(a)

760mm

(b)

76 cm

(c)

both a & b

(d)

760 cm

29.

Value of gas constant R is ____________

(a)

0.082dm³atm

(b)

0.987 cal mol^-1 K^-1

(c)

8.3 J mol^-1 K^-1

(d)

8 er mol^-1 K^-1

30.

25g of each of the following gases are taken at 27°C and 600 mm Hg pressure. Which of these will have the least volume?

(a)

HBr

(b)

HCI

(c)

(d)

31.

Which of the following diagrams correctly describes the behaviour of a fixed mass of an ideal gas? (T is measured in K)

(a)

(b)

(c)

(d)

All of these

32.

When CaC₂ is heated in atmospheric nitrogen in an electric furnace the compound formed is ___________

(a)

Ca(CN)₂

(b)

CaNCN

(c)

CaC₂N₂

(d)

CaNC₂

33.

The name 'Blue John' is given to which of the following compounds ?

(a)

CaH₂

(b)

CaF₂

(c)

Ca₂(PO₄)₂

(d)

CaO

34.

Which of the following statement is false ?

(a)

Ca²⁺ ions are not important in maintaining the regular beating of the heart

(b)

Mg²⁺ ions are important in the green parts of the plants

(c)

Mg²⁺ ions form a complex with ATP

(d)

Ca²⁺ ions are important in blood clotting

35.

In which process, fused sodium hydroxide is electrolysed for extraction of sodium ?

(a)

Castner's process

(b)

Cyanide process

(c)

Down process

(d)

All of these

36.

Lithium shows diagonal relationship with _____________

(a)

sodium

(b)

magnesium

(c)

calcium

(d)

aluminium

37.

RbO₂ is _____________

(a)

superoxide and paramagnetic

(b)

peroxide and diamagnetic

(c)

superoxide and diamagnetic

(d)

peroxide and paramagnetic

38.

sodium is stored in _____________

(a)

alcohol

(b)

water

(c)

kerosene

(d)

none of these

39.

Which of the following has the highest tendency to give the reaction \(M_{g}^{+}\xrightarrow[Medium]{Aqueous}M_{aq}^{+}\)

(a)

(b)

(c)

(d)

40.

Which of the following statements is in correct ?

(a)

Li⁺ has minimum degree of hydration among alkali metal cations

(b)

The oxidation state of K in KO₂ is +1

(c)

Sodium is used to make Na / Pb alloy

(d)

MgSO₄ is readily soluble in water

41.

Maximum deviation from ideal gas is expected from ______________

(a)

CH₄(g)

(b)

NH₃ (g)

(c)

H₂(g)

(d)

N₂ (g)

42.

Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are Vander Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases the most easily liquefiable one is __________

(a)

(b)

(c)

(d)

43.

Equal moles of hydrogen and oxygen gases are placed in a container, with a pin-hole through which both can escape what fraction of oxygen escapes in the time required for one-half of the hydrogen to escape.

(a)

\(\frac { 3 }{ 8 } \)

(b)

\(\frac { 1 }{ 2 } \)

(c)

\(\frac { 1 }{ 8 } \)

(d)

\(\frac { 1 }{ 4 } \)

44.

The value of the gas constant R is ____________

(a)

0.082 dm³ atm.

(b)

0.987 cal mol^-1K^-1

(c)

8.3 J mol^-1 K^-1

(d)

8 erg mol^-1 K^-1

45.

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules _____________

(a)

are above inversion temperature

(b)

exert no attractive forces on each other

(c)

do work equal to the loss in kinetic energy

(d)

collide without loss of energy

46.

Which of the following is the correct expression for the equation of state of van der Waals gas?

(a)

\(\left( P+\frac { a }{ { n }^{ 2 }{ V }^{ 2 } } \right) (V-nb)=nRT\)

(b)

\(\left( P+\frac { na }{ { n }^{ 2 }{ V }^{ 2 } } \right) (V-nb)=nRT\)

(c)

\(\left( P+\frac { { an }^{ 2 } }{ { V }^{ 2 } } \right) (V-nb)=nRT\)

(d)

\(\left( \frac { P+{ n }^{ 2 }{ a }^{ 2 } }{ { V }^{ 2 } } \right) (V-ab)=nRT\)

47.

Rate of diffusion of a gas is ________

(a)

directly proportional to its density

(b)

directly proportional to its molecular weight

(c)

directly proportional to its square root of its molecular weight

(d)

inversely proportional to the square root of its molecular weight

Assertion and reason

1 x 2 = 2

48.

Assertion : Generally alkali and alkaline earth metals form superoxides
Reason : There is a single bond between O and O in superoxides
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 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