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#### 12th All Chapter 1 mark Impatant Question

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 60
60 x 1 = 60
1. Which one of the following is not feasible

(a)

$Zn(s)+C{ u }^{ 2+ }\left( aq \right) \rightarrow Cu\left( s \right) +{ Zn }^{ 2+ }(aq)$

(b)

$Cu(s)+Z{ n }^{ 2+ }(aq)\longrightarrow Zn(s)+{ Cu }^{ 2+ }(aq)$

(c)

$Cu(s)+2Ag^{ + }(aq)\longrightarrow Ag(s)+{ Cu }^{ 2+ }(aq)$

(d)

$Fe(s)+{ Cu }^{ 2+ }(aq)\longrightarrow Cu(s)+{ Fe }^{ 2+ }(aq)$

2. In the Ellingham diagram, for the formation of carbon monoxide

(a)

$\left( \cfrac { \Delta { S }^{ 0 } }{ \Delta T } \right)$

(b)

$\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right)$ is positive

(c)

$\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right)$ is negative

(d)

initially $\left( \cfrac { \Delta T }{ \Delta { G }^{ 0 } } \right)$ is positive, after 700oC,$\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right)$ is negative

3. The process of heating of copper pyrites to remove sulphur is called

(a)

froth flotation

(b)

roasting

(c)

calcination

(d)

smelling

4. $HgS_{ (s) }+{ O }_{ 2(g) }\longrightarrow { Hg }_{ (l) }+{ SO }_{ 2 }\uparrow$ The above reaction is an example of _________reduction.

(a)

metal

(b)

hydrogen

(c)

carbon

(d)

auto

5. Which among the following is not a borane?

(a)

B2H6

(b)

B3H6

(c)

B4H10

(d)

none of these

6. Which of these is not a monomer for a high molecular mass silicone polymer?

(a)

Me3SiCl

(b)

PhSiCl3

(c)

MeSiCl3

(d)

Me2SiCl2

7. Group 14 elements have general electronic configuration _______

(a)

ns2

(b)

ns2np4

(c)

ns2np6

(d)

ns2np2

8. The silicates which contain discrete tetrahedral units are _______

(a)

ortho silicates

(b)

sheet silicates

(c)

pyrosilicates

(d)

three dimensional silicates

9. Which is true regarding nitrogen?

(a)

least electronegative element

(b)

has low ionisation enthalpy than oxygen

(c)

d- orbitals available

(d)

ability to form pπ-pπ bonds with itself

10. Among the following, which is the strongest oxidizing agent?

(a)

Cl2

(b)

F2

(c)

Br2

(d)

l2

11. Which of the following is correct?

(a)

H3PO3 is dibasic and reducing

(b)

H3PO3 is dibasic and non-reducing

(c)

H3PO4 is tribasic and reducing

(d)

H3PO3 is tribasic and non-reducing

12. The high reactivity of fluorine is due to_________

(a)

high ionisation energy

(b)

low bond dissociation energy

(c)

low electron affinity

(d)

high electro negativity

13. Among the transition metals of 3d series, the one that has highest negative $\left( \frac { M^{ 2+ } }{ M } \right)$ standard electrode potential is

(a)

Ti

(b)

Cu

(c)

Mn

(d)

Zn

14. The most common oxidation state of actinoids is

(a)

+2

(b)

+3

(c)

+4

(d)

+6

15. Hybridisation of chromium ions and dichromate ions is

(a)

Sp2

(b)

Sp3d

(c)

both (a) and (b)

(d)

None of these

16. The element corresponding to the electronic configuration [Rn]5f3 6d17sis _________

(a)

Neptunium

(b)

Plutonium

(c)

Uranium

(d)

Americium

17. In which of the following coordination entities the magnitude of Δ0 will be maximum?

(a)

[Co(CN)6]3-

(b)

[Co(C2O4)]3-

(c)

[Co(H2O)6]3+

(d)

[Co(NH3)6]3+

18. Formula of tris(ethane-1,2-diamine)iron(II)phosphate

(a)

[Fe(CH3-CH(NH2)2)3](PO4)3

(b)

[Fe(H2N-CH-CH2-NH2)3](PO4)

(c)

[Fe(H2N-CH2-CH2-NH2)3](PO4)2

(d)

[Fe(H2N-CH2-CH2-NH2-NH2)3]3(PO4)2

19. The oxidation number of nickel in complex ion, [NiCI4]2- is

(a)

+1

(b)

-1

(c)

+2

(d)

-2

20. Magnu's green salt in______________

(a)

[Pt(NH3)4[[PtCl4]

(b)

K[PtCl3(C2H4)]

(c)

[Ni(CO)4]

(d)

[Fe(Co)5]

21. Assertion : monoclinic sulphur is an example of monoclinic crystal system
Reason: for a monoclinic system, $a\neq b\neq c$ and $\alpha =\gamma ={ 90 }^{ 0 },\beta \neq { 90 }^{ 0 }$

(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.

22. The number of unit cells in 8 gm of an element X ( atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)

(a)

6.023 X 1023

(b)

6.023 X 1022

(c)

60.23 X 1023

(d)

$\left( \cfrac { 6.023\times { 10 }^{ 23 } }{ 8\times 40 } \right)$

23. Which of the following is incorrect statement about the Bragg's equation nλ = 2d sin θ?

(a)

n, represents order of reflection

(b)

λ, represents wave length of uv-rays used

(c)

θ, represents angle of incidence

(d)

d, represents distance between two parallel planes

24. Amorphous solids can also be called _______

(a)

pseudo solids

(b)

true solids

(c)

super cooled liquids

(d)

both (a) & (c)

25. In a first order reaction $x\longrightarrow y$ if k is the rate constant and the initial concentration of the reactant x is 0.1M, then, the half life is

(a)

$\left( \cfrac { log2 }{ k } \right)$

(b)

$\left( \cfrac { 0.693 }{ (0.1)k } \right)$

(c)

$\left( \cfrac { In2 }{ k } \right)$

(d)

none of these

26. The correct difference between first and second order reactions is that (NEET)

(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.

27. What would be the rate of disappearance of oxygen, if the rate of formation of nitric oxide (NO) is 3.6 xl0-3mol L-1 s-1?

(a)

4 x10-3mol L-1s-1

(b)

4 x10-3mol-1 L-1s-1

(c)

4.5 x 10-3mol L-1s-1

(d)

4.5 x 10-3mol-1 L-1s-1

28. CH3COOCH3 + H2$\overset { { H }^{ + } }{ \longrightarrow }$ CH3COOH + CH3OH is an example of _______ order reaction.

(a)

first

(b)

zero

(c)

third

(d)

pseudo

29. Which will make basic buffer?

(a)

50 mL of 0.1M NaOH+25mL of 0.1M CH3 COOH

(b)

100 mL of 0.1M CH3COOH+100 mL of 0.1M NH4OH

(c)

100 mL of 0.1M HCl+200 mL of 0.1M NH4OH

(d)

100 mL of 0.1M HCl+100 mL of 0.1M NaOH

30. Which of the following relation is correct for degree of hydrolysis of ammonium acetate?

(a)

$h=\sqrt { \frac { { K }_{ h } }{ C } }$

(b)

$h=\sqrt { \frac { { K }_{ h } }{ K_b } }$

(c)

$h=\sqrt { \frac { { K }_{ h } }{ { K }_{ a }.{ K }_{ b } } } \\$

(d)

$h=\sqrt { \frac { { { K }_{ a }.{ K }_{ b } } }{ { K }_{ h } } } \\$

31. Pick out the incorrect statement regarding Lewis acids and bases

(a)

A Lewis acid is a electron deficient molecule

(b)

Lewis bases is one which donates an electron pair

(c)

Lewis base is a cation

(d)

Lewis acid is a electron deficient molecule and Lewis base is a cation

32. Degree if dissociation is nearly equal to 1for

(a)

Strong acids and strong bases

(b)

Strong acids and weak bases

(c)

Weak acids and strong bases

(d)

Weak acids and weak bases

33. The equivalent conductance of M/36solution of a weak monobasic acid is 6mho cm2 and at infinite dilution is 400 mho cm2. The dissociation constant of this acid is

(a)

1.25 ×10−6

(b)

6.25 x 10-6

(c)

1.25 ×10−4

(d)

6.25 x 10 -5

34. Conductivity of a saturated solution of a sparingly soluble salt AB (1:1 electrolyte) at 298K is 1.85 ×10−5 S m−1. Solubility product of the salt AB at 298K (Aom)AB = 14 ×10−3Sm2 mol−1.

(a)

5.7 x10 -12

(b)

1.32×10−12

(c)

7.5 ×10−12

(d)

1.74 x10 -12

35. Standard electrode potential of Sn4+ / Sn2+  couple is +0.15 V and that of Cr3+ / Cr is 0.85 V. When connected, the cell potential will be

(a)

1.10 V

(b)

1.00 V

(c)

0.70 V

(d)

0.30 V

36. The emf of the unknown half cell is __________

(a)

Emeasured = ER - EL

(b)

Emeasured = EL - ER

(c)

Emeasured = - nFE

(d)

Emeasured = Eo$\frac{RT}{F}$ log

37. Assertion : Coagulation power of Al3+ is more than Na+.
Reason : greater the valency of the flocculating ion added, greater is its power to cause precipitation

(a)

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

(b)

if 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

38. If x is the amount of adsorb ate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?

(a)

x/m=f(P) at constant T

(b)

x/m=f(T) at constant P

(c)

P = f(T) at constant x/m

(d)

x/m = PT

39. The autocatalyst in the oxidation of oxalic acid by acidified KMnO4 is

(a)

K2SO4

(b)

MnSO4

(c)

KMnO4

(d)

CO2

40. The platinum catalyst used in the oxidation of SO2 by contact process is poisoned by

(a)

As2O3

(b)

V2O5

(c)

Fe2O3

(d)

CuCl2

41. In the reaction Ethanol $\overset { { PCl }_{ 5 } }{ \longrightarrow } X\overset { alc.KOH }{ \longrightarrow } Y\overset { { H }_{ 2 }{ SO }_{ 4 }/{ H }_{ 2 }O }{ \underset { 298k }{ \longrightarrow } } Z.$ The ‘Z’ is

(a)

ethane

(b)

ethoxyethane

(c)

ethylbisulphite

(d)

ethanol

42. The reactions

is an example of

(a)

Wurtz reaction

(b)

cyclic reaction

(c)

Williamson reaction

(d)

Kolbe reactions

43. Which of the following gives violet colour with neutral ferric chloride solution?

(a)

phenol

(b)

glycerine

(c)

benzyl alcohol

(d)

ethanol

44. The common name for 4-hydroxy toluene is ________

(a)

p-cresol

(b)

m-cresol

(c)

resoricinol

(d)

catechol

45. Predict the product Z in the following series of reactions Ethanoic acid $\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous\quad AlcI }{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.$

(a)

(CH3)2 C(OH)C6H5

(b)

CH3CH(OH)C6H5

(c)

CH3CH(OH)CH2- CH3

(d)

46. The IUPAC name of

(a)

but – 3- enoicacid

(b)

but – 1- ene-4-oic acid

(c)

but – 2- ene-1-oic acid

(d)

but -3-ene-1-oicacid

47. CH3CH2CH2CH2COOH and ${ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }COOH$ are examples of  ________ isomerism.

(a)

geometrical

(b)

funcational

(c)

chain

(d)

postional

48. Formic acid contains both __________ and ________ groups.

(a)

-CHO and OH

(b)

-CHO and X-O

(c)

-CHO and COOH

(d)

-CHO and -O-

49. Nitrobenzene on reaction with at 80-100oC forms which one of the following products?

(a)

1,4 – dinitrobenzene

(b)

2,4,6 – tirnitrobenzene

(c)

1,2 – dinitrobenzene

(d)

1,3 – dinitrobenzene

50. Secondary nitro alkanes react with nitrous acid to form

(a)

red solution

(b)

blue solution

(c)

green solution

(d)

yellow solution

51. Which of the following cannot be prepared by Sandmeyer's reaction?

(a)

Iodobenzene

(b)

Fluorobenzene

(c)

both Iodobenzene and Fluorobenzene

(d)

neither Iodobenzene and Fluorobenzene

52. Sandmeyer's reaction occurs in the presence of _________ and __________

(a)

cuprous halide and halo acid

(b)

cupric halide and halogen

(c)

copper - zinc couple and H2

(d)

none of these

53. The number of sp2 and sp3 hybridised carbon in fructose are respectively

(a)

1and 4

(b)

4 and 2

(c)

5 and 1

(d)

1 and 5

54. Which of the following statement is correct?

(a)

Ovalbumin is a simple food reserve in egg-white

(b)

Blood proteins thrombin and fibrinogen are involved in blood clotting

(c)

Denaturation makes protein more active

(d)

Insulin maintains the sugar level of in the human body

55. Carbohydrates are

(a)

polyhydroxy aldehydes

(b)

polyhydroxy ketones

(c)

polyhydroxy acids

(d)

both (a) and (b)

56. On hydrolysis, which one of the following disaccharide will give a ketose and an aldose?

(a)

Maltose

(b)

Sucrose

(c)

Lactose

(d)

All the above

57. Which of the following is an analgesic?

(a)

Streptomycin

(b)

Chloromycetin

(c)

Asprin

(d)

Penicillin

58. Which of the following is a co-polymer?

(a)

Orlon

(b)

PVC

(c)

Teflon

(d)

PHBV

59. The formulation of dettol contains

(a)

chloroxylenol

(b)

terpineol

(c)

alcohol

(d)

all of these

60. A 1% solution of phenol is a _______

(a)

antiseptic

(b)

disinfectant

(c)

antimalarial drug

(d)

anthithistamine