Page.No: 49

EAMCET CRASH COURSE ASSIGNMENTS VOLUME-141.A substance which gives brick red flame and

breaks down on heating to give oxygen and abrown gas is1) Magnesium nitrate 2) Calcium nitrate3) Barium nitrate 4) Strontium nitrate

II. Anomalous behaviour of Be & its Diagonalrelationship with Al

42. Highest melting point alkaline earth metal is1)Be 2) Ca 3) Sr 4) Ba

43. Which of the following is highly exothemic inwater.

1) 2Mg+

2) 2Be+

3) 2Ba+

4) 2Ca+

III. ( ) 32, ,Cao Ca OH CaCO , Gypsum, Plaster of

paris & cement44.Chemical ‘A’ is used for water softening to remove

temporary hardness. ‘A’ reacts with sodiumcarbonate to generate caustic soda. Whencarbondioxide is bubbled through ‘A’, it turnscloudy. What is the chemical formula of ‘A’?1) Ca(OH)

2 2) CaCO

3 3) CaO 4) Ca(HCO

3)2

45.The setting of Hydraulic Mortar involves theformation of1) Calcium Silicate & Calcium Aluminiate2) Calcium Silicate & Calcium phosphate3) Calcium Carbonate & Calcium bicarbonate4) Calcium dihydrogen phosphate & CalciumAluminiate

46.Which one of the following is dead burnt plaster ?

1) 4 2(CaSO ).H O 2) 3CaSO

3) 4 2 CaSO .2H O 4) Anhydrous

4CaSO

47.The role of gypsum in cement is 1) To decrease setting time

2) To increase porous nature 3)To increase setting time

4)To decrease porous nature48. During the Conversion of one mole of gypsum to

one mole of plaster of paris the percentage loss inweight is

1)27 2) 20 3) 15.7 4) 7.85IV.Biological improtance of calcium and

magnesium ions49. Which of the following is not correct Statement

1) ( )3 4 2Ca po is present in bones

2) 3 4 2 23 ( ) ,Ca po CaF is part of enamel on teeth

3) 2Ca+

ions are important in blood clothing

4) chlorophyll is a campound of calcium50. The ATP forms a camplex with

1) 2Ca+

2) 2Mg+

3) 2Be+

4) 2Ba+

KEY - IA& IIA GROUP ELEMENTS1)3 2)2 3)1 4)4 5)3 6)47)4 8)1 9)3 10)1 11)2 12)413)3 14)2 15)3 16)3 17)1 18)119)2 20)1 21)2 22)2 23)3 24)225)4 26)3 27)2 28)4 29)3 30)431)1 32)4 33)4 34)2 35)1 36)437)2 38)2 39)3 40)1 41)2 42)143)2 44)1 45)1 46)4 47)3 48)349)4 50)2

IIIA GROUP & IVA GROUP1. Which member of group 13 does not exhibit the

group valency in its compounds ?

1) B 2) Al 3) Ga 4) Tl

2. Correct statements among the following

A) Both 3BCl and 3A lC l are electrophiles

B) Both B2O

3 and 2 3Al O are amphoteric

C) both B and A l liberate H2 gas with alkalies

D) Both B and A l exhibit allotropy

1) A, B 2) B, C 3) C, D 4) A, C

3. Strongest Lewis acid among the following

1) BF3

2) 3BCl 3) BBr3

4) 3BΙ4. For a Diborane molecule, the following is not appli-

cable

1) Maximum no. of planar atoms is 6

2) one B – B bond is present

3) 4 Hydrogen atoms can be replaced by CH3 groups

4) Two sp3 – s – sp3 bonds are present

5. B2H

6 does not liberate H

2 gas with

1) KOH 2) HCl 3) NH3

4) 2Ι6. Borax bead test is not given by

1) Al2 (SO

4)

32) Cu(NO

3)

2

3) NiSO4

4) (CH3COO)

2 Co

7. ⎯⎯⎯⎯⎯⎯⎯→ ⎯⎯⎯→4 3

0

LiAlH / dry ether NH3 200

BCl 'A ' ' B' . The

Empirical formula of 'B' is1) B

3N

3H

6 2)B

2H

6.2NH

3 3) BNH

2 4) B

2H

6

8. Aluminium hydroxide on dissolution in NaOH solu-tion results in the formation of1) [Al(H

2O)

4 (OH)

2 ]+ 2) [Al(H

2O)

3.(OH)

3]

3) [Al(H2O)

2(OH)

4]– 4) [Al(H

2O)

6 (OH)

3]3–

9. The maximum number of H- atoms present in thesame plane in Diborane molecule is1) 2 2) 6 3) 4 4) 3

Page.No: 50

EAMCET CRASH COURSE ASSIGNMENTS VOLUME-110. The statements regarding Diborane are

a) Diborane contains 2-centred -3-electron bonds

b) B-H bond is formed by sp3 –s overlapping

c) I t contains two coplanar BH2 groups

The correct statements are

1) a and b are correct 2) b and c are correct

3) a and c are correct 4) b is only correct

11. Which of the following pair acts as best oxidising

agents ?

1) B3+

, Al3+

2) Al3+

, Si+2

3) B3+

, Ga+3

4) Tl3+

, Pb4+

12. In conc.HNO3, Aluminium becomes passive due to

the formation of a layer of

1) AlN 2) Al2S

33) Al

4C

34) Al

2O

3

13.Which one of the following is a correct statement ?

1) The hydroxides of Al is more acidic than Boron

2) The hydroxide of Boron is basic, while that of Al

is Amphoteric

3) The hydroxide of Boron is acidic, while that of Al

is Amphoteric

4) The hydroxides of both Boron and Al are Am-

photeric

14.Compound 'X' on reduction with LiAlH4 gives a hy-

dride 'Y' containing 21.72% Hydrogen along with

other products. The compound 'Y" reacts with air

explosively to give B2O

3. 'X' &'Y' are respectively

1) B2H

6, BCl

32) B

4H

10, B

2Cl

6

3) BCl3, B

2H

64) BCl

3, B

4H

8

15.AlCl3 forms a dimer because , Al

1) belongs to IIIA group

2) can have a coordination number 6

3) Electron deficient compound

4) Has high heat of Hydration

16.Amphoteric oxide among the following

1) SiO2

2) CO2

3) B2O

34) PbO

2

17.Which of the following does not exist ?

1) 26CC −� 2)

26SiF−

3) 26GeF− 4) 2

6SnC −�18. L

1 is the length between two adjacent carbon atoms

in a layer and L2 is the length in between two layers

of graphite, the approximate ratio between L1 and

L2 is

1) 1 : 1 2) 2 : 5 3) 5 : 2 4) 1 : 5

19.Match the following

List – I (Central atoms) List – II (Hyb.)A)Diamond 1)SP3

B)SiO2

2)SP2

C)C3O

23)SP3d

D)CO 4)SP

5)dSP2

A B C D1) 1 2 3 42) 1 1 4 43) 1 1 4 54) 2 2 4 3

20. Which of the following order is correct?

1) Ge+2 > Pb+2 > Sn+2 ( Reducing power)

2) Pb+4 > Sn+4 > Ge4+ ( Oxidising power)

3) Ge4 > Sn+4 > Pb4 ( Oxidising power)

4) Ge+2 = Pb+2 > Sn+2 ( Reducing power)

21. Assertion (A) : Stannous chloride is Ionic & Re-

ducing in Nature

Reason (R): "Sn" shows both +2 & +4 oxidation

states

1) A and R are true and R is the correct explanation

of A.

2) A and R are true and R is not the correct expla-

nation of A.

3) A is true, R is false. 4) A is false, R is true.

22. SiO2

F2

C

X

Y

Which is incorrect regarding

'X' & 'Y' ?

1) 'X' on Hydrolysis gives Silica gel 2)'Y' doesn't

react with 'Mg' in Electric Furnace

3) 'X' shows reaction with HF forming H2SiF

6

4) 'Y' is a hard substance used in Electronic devices

23.Which of the following is not a protonic acid ?

1) B(OH)3 2) PO(OH)

33) SO(OH)

24) SO

2(OH)

2

24.The substance with chemical formula Na2 Al

2 Si

2 O

8.

xH2O is also called

1) Sodium zeolite 2) Feldspar 3) Asbestos 4)Mica

25.Which is true about the hydride of Boron which is

obtained by the reaction of BCl3 and LiAlH

4?

1) Its formula is BH3

2) It is electron rich compound

3) Its molecule contains only one banana bond

4) It contains three centred as well as two centred

bonds

26.H3BO

3 is

1) Monobasic, weak Lewis acid

2) Monobasic, weak Bronsted acid

3) Tribasic, weak Bronsted acid

4) Monobasic, strong Lewis acid

27.Aqueous solution of Borax acts as a buffer because

1) It contains weak acid and its salt with strong base

2) It contains tribasic acid and strong base

3) It contains number of neutral water molecules

4) It contains weak base and its salt with strong acid

Page.No: 51

EAMCET CRASH COURSE ASSIGNMENTS VOLUME-128.A : In water, OrthoBoric acid behaves as a weak

monobasic acid

R : In water, OrthoBoric acid acts as a proton do-

nor.

1) A and R are true and R is the correct explanation

of A.

2) A and R are true and R is not the correct expla-

nation of A.

3) A is true, R is false. 4) A is false, R

is true.

29 A : BF3 is stronger Lewis acid than BCl

3

R : The electronegativity of Fluorine is greater than

that of Chlorine

1) A and R are true and R is the correct explanation

of A.

2) A and R are true and R is not the correct expla-

nation of A.

3) A is true, R is false. 4) A is false, R is true.

30.From B2H

6, all the following can be prepared

except

1) H3BO

32) B

2(CH

3)

4H

2

3) B2(CH

3)

64) NaBH

4

31.The banana bond in diborane is constituted by:

1) 2 atoms and 2 electrons

2) 2 atoms and 3 electrons

3) 3 atoms and 2 electrons

4) 3 atoms and 3 electrons

32.In borax bead test, which of the following compound

is formed?

1) Metaborate 2) Tetraborate

3) Double oxide 4) Orthoborate

33.Which of the following alloys is used for making

aeroplane parts?

1) Constantan 2) Dutch metal

3) Alnico 4) Duralumin

34.Al and Ga have nearly the same covalent radus be-

cause of:

1) greater shielding effect of s-electrons of Ga atom

2) poor shielding effect of s-electrons of Ga atom

3) poor shielding effect of d-electrons of Ga atom

4) greater shielding effect of d-electrons of Ga atom

35.The soldiers of Napolian army while at Alps during

freezing winter suffered a serious problem as reagards

the tin buttons of their uniforms. While metallic tin

buttons got converted into grey powder. This trans-

formation is related to:

1) an interaction with nitrogen of the air at very low

temperatures

2) a change in the crystalline structure of tin

3)a change in the partial pressure of oxygen in the air

4) an interaction with water vapour contained in the

humid air.

36.Graphite is a soft solid lubricant extremely difficult to

melt. The reason for this anomalous behaviour of

graphite is:

1) that it has carbon atoms arranged in large plates

of rings of strongly bound carbon atoms with weak

interplate bonds.

2) it is a noncrystalline substance

3) it is an allotropic form of carbon

4) it has molecules of variable molecular masses like

polymers.

37.Solid carbond dioxide is known as dry ice because:

1) it melts at 00C

2) it evaporates at -780C without melting

3) it evaporates at 400C 4) its boiling point is high.

38. 4 4,PbF PbCl exist but 4 4,PbBr PbI do not exist

because :

1) large size of Br− and I − ions.

2) strong oxidising nature of 4Pb + ion

3) strong reducing nature of 4Pb + ion

4) low electronegativity of Br− and I − ions.

39.Which of the following oxides is amphoteric in char-

acter?

1) CaO 2) 2CO 3) 2SiO 4) 2SnO40.The stability of dihalides of Si, Ge, Sn and Pb in-

creases steadily in the sequence:

1) 2 2 2 2PbX SnX GeX SiX< < <

2) 2 2 2 2GeX SiX SnX PbX< < <

3) 2 2 2 2SiX GeX PbX SnX< < <

4) 2 2 2 2SiX GeX SnX PbX< < <

41.In 2

6SiF − and 2

6SiCi − which one is known and why?

1) 2

6SiF − because of small size of F

2) 2

6SiF − because of large size of F

3) 2

6SiCi − because of small size of Cl

4) 2

6SiCi − because of large size of Cl

Page.No: 52

EAMCET CRASH COURSE ASSIGNMENTS VOLUME-142.The products of the following reaction are :

2SiO C Δ+ ⎯⎯→

1) SiC and CO2

2) SiC and CO

3) SiO and CO 4) Si and CO2

43.Diborane reacts with ammonia under different con-

ditions to give a variety of products. Which one

among the following is not formed in these reactions?

1) 2 6 3. 2B H NH 2) 12 12B H 3) 3 3 6B N H 4) ( )nBN44.The element that does not show catenation property

among the following p-block elements, is:

1) carbon2) silicon 3) germanium 4) lead

45.Syn. gas is a mixture of:

1) 2 2CO H+ 2) 2CO H+ 3) 2CO CO+ 4) 2CO N+

KEY SHEETIIIA Group, IVA Group

1)4 2)4 3)4 4)2 5)4 6)1

7)3 8)3 9)3 10)2 11)4 12)4

13)3 14)3 15)3 16)4 17)1 18)2

19)2 20)2 21)2 22)2 23)1 24)1

25)4 26)1 27)1 28)3 29)4 30)3

31)3 32)1 33)4 34)3 35)2 36)1

37)2 38)2 39)4 40)4 41)1 42)2

43)2 44)4 45)2