AHSTA ACADEMIC COUNCIL

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HSS ONLINE MODEL EXAM 2020
MCQs For CHEMISTRY
..........................................................................................................................................................
Prepared by
MUHAMMED SHAFEEN
C.M.M.H.S.S THALKKULATHUR

NAME OF STUDENT

NAME OF SCHOOL

1. How many significant figures are present in 6.02x1023 ?

1 point

a.4

b.3

c.infinity

Option 4

Clear selection

2. Calculate the no of mole of O2 required to produce 240g of MgO by burning Mg metal?

1 point

a. 3 mole

b.4 mole

c.5 mole

d.2 mole

Clear selection

3. The no of electrons ejected during the time of photo electric effect was depend upon the ---------------------- of the incident light.

1 point

a. Intensity

b. frequency

c. wavelength

d. none of these.

Clear selection

4. In hydrogen spectrum ------------------------ series appearing in visible region.

1 point

a. lyman

b.paschen

c.balmer

d. pfund

Clear selection

5.The radius of the third orbit of He+ will be

1 point

a.8.46 Å

b.0.705 Å

c.1.59 Å

d.2.38 Å

Clear selection

6. The wave length of a body of mass 100g ,moving with a velocity of 20 m/s is -----------------

1 point

a. 3.31x10-34 m/s

b.6.626 x10 -26 m/s

c. 4.51X10-35 m/s

d.6.626x10-34 m/s

Clear selection

7. The correct order of electron gain enthalpy is---------

1 point

a. Cl>F>Br

b.F >Cl >Br

c.Br> F> Cl

d.Br> Cl>F

Clear selection

8.The electronic configuration of the atom having maximum difference in first and second ionization enthalpy is

1 point

a.1S22S22P6 3S1

b.1S22S22P6 3S2

c.1S22S22P4

d.1S22S22P3

Clear selection

9.. Among Al2O3,SiO2 ,P2O3and SO2 the correct order of acidic strength is --

1 point

a.SO2< P2O3< SiO2< Al2O3

b. Al2O3< SiO2 < P2O3 < SO2

c. Al2O3> SiO2> P2O3 > SO2

d. SiO2< SO2 < Al2O3< P2O3

Clear selection

10. Factor which favourable for the formation of ionic bond is

1 point

a. High ionization enthalpy

b.low lattice enthalpy

c..low ionization enthalpy

d..none of the above

Clear selection

11.. The relative stability of the following species is

1 point

a.O2 <O2+< O2-

b. O2- < O2 < O2+

c. O2+ <. O2-< O2

d. O2-> O2+> O2

Clear selection

12.. When bond length increases bond order is ------------

1 point

a. increases

b. remain unchanged

c. decreses

d. none of the above

Clear selection

13.. which one of the following arrangements of molecules is correct on the basis of their diple moments?

1 point

a. BF3 >NF3> NH3

b.NF3 >BF3> NH3

c. NH3>BF3 >NF3

d. NH3>NF3>BF3

Clear selection

14. H2O ,NH3, CH4,BF3 which has more bond angle? a. H2O b. NH3 c. CH4 d. CO2

1 point

a. H2O

b. NH3

c. CH4

d. CO2

Clear selection

15. The condition which a gas obey the ideal gas law ( equation )

1 point

a. high pressure and low temperature

b. low pressure high temperature

c. high pressure and high temperature

d.low pressure and low temperature .

Clear selection

16.. The temperature at which a real gas obeys ideal gas law over an appreciable range of pressure is called --------

1 point

a. Boiling point

b. freezing point

c. boyle point

d. critical temperature

Clear selection

17.. liquid drops are spherical in shape due to

1 point

a. viscosity

b. evaporations

c. surface tension

d. none of the above

Clear selection

18.To which of the following mixtures Dalton’s law partial pressure is not applicable?

1 point

a. CO2 and CO

b. CO2 and N2

c. HCl and NH3

d.CH4 and C2H6

Clear selection

19. The enthalpies of all elements in their standard states are ---------------

1 point

a. unity

b. zero

c. lessthan zero

d. different for each element

Clear selection

20. which is not an extensive property

1 point

a.volume

b.internal energy

c. density

d.entropy

Clear selection

21.. ΔH , ΔG,T, ΔS related as

1 point

a. ΔG = ΔH + T ΔS

b. ΔH= ΔG+ T ΔS

c. ΔG = ΔH - T ΔS

d. no relationship

Clear selection

22. The heats of combustion of carbon and carbon monoxide are -390kJ and -278 kJ respectively. The heat of formation of carbon monoxide is

1 point

a. -112KJ

b. - 668KJ

c.112KJ

d.668 KJ

Clear selection

23. The value of Kp for the reaction 2SO2 + O2 <-> 2SO3 at 700 k is 1.3 x10-3 atm-1. The value of kc at the same temperature will be

1 point

a.1.1x10-2

b.3.1x10-2

c.5.2x10-2

d.7.4x10-2

Clear selection

24.. if Qc > Kc ---------------------- reaction take place a. forward b.backward c. no reaction d. none of these

1 point

a. forward

b.backward

c. no reaction

d. none of these

Clear selection

25. 2SO2 + O2 --> 2SO3, ΔH = -192.5KJ. For this reaction increasing temperature favorable for

1 point

a. forward

b.backward

c. no effect

d. none of these

Clear selection

26.which is a Lewis acid ?

1 point

a.NH3

b..AlCl3.

c. H2O

d. none of these

Clear selection

27.. The PH value of 0.10 M NaOH solution is

1 point

a.10

b.11

c. 12

d .13

Clear selection

28. The conjugate base of H2PO4- is

1 point

a. PO43-

b. HPO42-

c.H3PO4

d.P2O5

Clear selection

29.. The oxidation state Mn is maximum in

1 point

a.MnO2

b.K2MnO4

c.Mn3O4

d.KMnO4

Clear selection

30. In the reaction SO2+2H2S -->3S+2H2O, the substance oxidized is

1 point

a.H2O

b.SO2

C.S

d.H2S

Clear selection

31. water gas is a mixture of

1 point

a.CO+H2

b.CO2+H2

c.CO+N2

d.CO+H2+O2

Clear selection

32. An example for electron rich hydride is

1 point

a.BF3

b.HF

c.CH4

d.CaH2

Clear selection

33.. hardness of water is due to dissolved impurities of

1 point

a Calcium and magnesium salts

b. barium and magnesium salts

c. calcium and strontium salts

d .sodium and potassium salts.

Clear selection

34. Solvay process is used for the manufacture of :

1 point

A. sodium metal

b .washing soda

c. potassium chloride

d. ammonia

Clear selection

35. When sodium metal dissolved in liquid ammonia blue color solution is obtained. It is due to

1 point

a.electron

b. formation of sodium amide

c. ammoniated electron

d. none of these

Clear selection

36. when gypsum heated above 393 k -------------------- formed

1 point

a. plaster of Paris

b .dead burnt plaster

c. cement

d. lime

Clear selection

37.. chemical formula of inorganic benzene is-------

1 point

a.B3N3H6

b. C6H6

c. Na2B4O7

d. B2N2H6

Clear selection

38. Aqueous solution of borax is -----

1 point

a.acidic

b.neutral

c.basic

d.may be acidic or neutral

Clear selection

39.. The hybrid states of carbon in diamond and graphite are respectively

1 point

a.SP3 ,SP3

b.SP2,SP3

c.SP2,SP3

d.SP3,SP2

Clear selection

40.. Which is the temporary electron displacement effect?

1 point

a. .resonance effect

b. hyper conjugation

c.electromeric effect

d. inductive effect

Clear selection

41.Lassaigne’s test is used to detect

1 point

a. nitrogen and halogen

b. sodium and halogens

c. nitrogen and sulphur

d .nitrogen, sulphur and halogens.

Clear selection

42..Duma’s method involves the determination of nitrogen contents in the organic compound in the form of

1 point

a.NH3

b.N2

c. NaCN

d.(NH4)2SO4

Clear selection

43. Stability order of carbocation is given below which is correct.

1 point

a. (CH3)3+C < (CH3)2+CH< CH3+CH2 <+CH3

b. (CH3)2+CH<(CH3)3+C<+CH3 < CH3+CH2

c. +CH3 < CH3+CH2 < (CH3)2+CH< (CH3)3+C

d. CH3+CH2 < (CH3)2+CH< +CH3<(CH3)3+C

Clear selection

44. which of the following is not a nucleophile.

1 point

a. OH-

b.ammonia

c.BF3

d. HSO4-

Clear selection

45..The addition of HBR on propene occurs in accordance with

1 point

a. systzeff rule

b. markonikov’s rule

c.Hund’s rule

d.konowalov’s rule

Clear selection

46.. Alkene on treatment with Bayer’s reagent yield

1 point

a. Oxalic acid

b. Ethanol

c. Glyoxal

d.1,2-Ethanediol

Clear selection

47. The catalyst used in Fridel-craft’s reaction is

1 point

a. Aluminum chloride

b. Anhydrous aluminum chloride

c. Ferric chloride

d. copper

Clear selection

48. when three molecule of acetylene (CH≡CH) passed through red hot iron tube ,polymerise to give

1 point

a. C6H6

b.C6H5F

c.C2H4

d.C2H6

Clear selection

49.Which of the following is not a green house gas ?

1 point

a.CO2

b.CH4

c.O3

d.N2

Clear selection

50. The smog is essentially caused by the presence of

1 point

a. O2 and O3

b. Oxides of Sulphur and Nitrogen

c.O2 and N2

d.SO2 and SO3

Clear selection

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