COMPETENCY BASED QUESTIONS

Multiple Choice Questions Competency

Questions
Based
(c) Both C and H
Mark the correct answer out of the four options given
for each of the following
questions. (d) Carbon, hydrogen andoxygen
Which of the following gas is used for high hydrogen atoms in fourth
10. The number of carbon and
temperature welding ? homologue of alkyne series are respectively.
(a) Ethane () Ethyne (a) 4, 6 (b) 4, 8
(c) Ethene () Methane. (c) 5, 10 (d) 5, 8
Which statement about diamond is correct ? molecular mass any two
11. The difference in the
ie) Dianmond is less stable than graphite. adjacent homologue is always
(o) Diamond isgood conductor of electricity. (a) 14 (b) 12
(c) Diamond is more stable than graphite. (c) 8 (d) 16
() Diamond has very low nelting point. double bonds respectively are
in 12. How many single and molecule ?
1 The number of single bonds and lone pairs present in cyclobutene
ammonia molecule are respectively : (6) 8, 1
(6) 2, 2 (a) 4, 1
(a) 3. 1 (a) 10, 1
(d) 3,0. (c) 9, 1
(c) 1,3 atmosphere in the form of
The number of lone pairs and bond pairs of
electron in 13. Carbon exists in the
nitrogen nmolecule are respectively : (a) carbon monoxide only
traces and carbon dioxide
(a) 3,3 (b) 2, 3 (b) carbon monoxide in
(c) 3, 2 (d) 2, 2. (c) carbondioxide only
bonds present in
5 The number of single and double (d) coall
structural formula of benzene are : statements are usually correct
(b) 3, 3 14. Which of the following
(a) 9, 2 for carbon compounds ? These
(d) 9, 3. electricity
(c) 6, 6
substance can be used to test
() are good conductors of
6. Which of the following (ii) are poor conductors of electricity
hardness of water ?
attraction between their
(6) Soap solution (ii) have strong forces of
(a) Detergent molecules
(c) Ethanol solution (d) Ether.
attraction between
describes the conversion of (iv) do not have strong forces of
Which process best their molecules
vegetable oilto vegetable ghee ? (a) (i) and (iii) (b) (i) and (iii)
(a) Oxidation of oil (d) (ii) and ('v)
acidic medium (c) (i) and (iv)
(b) Hydrolysis of oil in
15. A mnolecule of ammonia (NH) has
(c) Catalytic hydrogenation of oils
(a) only single bonds
(d) Catalytic hydration of oils. allotrope of carbon ?
not an (b) only double bonds
8. Which of the following is
(a Graphite
(b) Fullerene (c) only triple bonds
bond
(c) BenzeHe
(d) Diamond (d) two double bonds and one single
constituent of organic allotropic form of
Which element is essential 16. Buckminster fullerene is au
(b) sulphur
Compounds ? (a) phosplorus
la 1ydrogen (c) carbon (d) tin
(h) Carbon

able
 Exam
cueyogapsgieto

unsaturated compounds
84
structuralisomers
24.
Identify the
following
from th
are correct
(ii) Propene
17. Which of the following (i) Propane
of butane ? H
(ivy) Chloropropane
H (ii)Propyne
H H H H H (b) (i)and (iv)
and (ü)
eueStions
(i) H-C--C-C-H (ü) a) i) (d) (i) and (iüi)
HH-C-HH (ii) and (iv)
(C)Chlorine reacts withsaturated hydrocarbons at room
H H H H
H 25. temperaturein the
H H
sunlight
(a) absenceof
H H H-C-C-H
ofsunlight
-Ç-H (v) H-C-C-H (b) presence
Based
Competency of water
H C-H (C) presence acid
H H ofhydrochloric
(6) (i)and (iy) (a) presence
(a) (i) and (üi) micelles
(a) (ii) and (iv) 26. In the soap on the surface of
(c) () and (ü) end of soap is
ionicwhile
(a) the
cluster the carbon chain is in the interIOr
Alkaline KMn04+Heat
18. CH-CH,-OH
CH,-COOH the cluster.
inter10r of the cluster
In the above given reaction, alkaline KMnO4
acts as b) jonic end of soap is in the of the cluster.
(b) oxidising agent the carbon chain is out
and
(a) reducing agent in the interior
carbon chain are
(c) catalyst (d) dehydrating agent lc) both ionic end and
of of the cluster.
19, Oils on treating with hydrogen in the presence
This is an chain are on the exterior
palladium or nickel catalyst form fats. (d) both ionic end and carbon
example of of the cluster.
formula C&H2. It has
(a) Addition reaction
27. Pentane has the molecular
(b) Substitution reaction (b) 12 covalent bonds
(a) 5 covalent bonds
(c) Displacement reaction (d) 17 covalent bonds
(d) Oxidation reaction
(c) 16covalent bonds
-OH is the 28. Structural formula of benzene is
20. In which of the following compounds,
functional group ? H H
(a) Butanone (b) Butanol
(c) Butanoic acid (d) Butanal
H
H-C C-H
21. The soap molecule has a H
(a) hydrophilic head and a hydrophobic tail (a) H
C-H
() H H

(6) hydrophobic head and a hydrophilic tail H H

(c) hydrophobic head and a hydrophobic tail

(d) hydrophilic head and a hydrophilic tail H
H H
Which of the following is the correct representation
of electron dot structure of nitrogen ? -

(a) :G:N: 0) :N:N:

(c) :N:N: H
H-C C-H
23, Structural formula of ethyne is (c)
H-C
H
(a) H--C=C-H (b) H,C-C=C-H yH
H- C-H H-C
H
H H H
(c) H
H H H H H
 Exam Cracker Science-X

{r(oCmBSE h
unsaturated compounds
the
84 24. Identify
structural isomers following
17. Which of the following are correct (i) Propene
of butane ? - () Propane
H H (iv) Chloropropane
H H H H
(ii) Propyne
Competency
Based
Questions) H-¢-¢-c-¢-Hi) H
C-H
(a) ()and (iü)
(b) (i) and (iv)
(d) (i) and (iii)
HH H H HH-Ç-H H (c) (ii) and (iv)
reacts with saturatedIhydrocarbons at room
H 25. Chlorine
temperature in the
H H
H H H sunlight
H-C-C-H (a) absence of
(iü) H-¢ H-Ç-C-H (b) presence of
sunlight
H C-H presence of water
(c)
H of hydrochloric acid
(a) (i) and (ii) (b) (ü) and (iv) (d presence
micelles
(c) (i) and (ii) (a) (iii) and (iv) 26. In the soap
surface of,
Alkaline KMnO4+Heat (a) the ionic end of soap is on the
18. CH-CH,-OH cluster while the carbon chain is in the
intot
CH-COOH the cluster.
In the above given reaction, alkaline KMn0, acts as clst.
(b) ionic end of soap is in the interior of the
(a) reducing agent (b) oxidising agent and the carbon chain is out of the cluster.
interi
(c) catalyst (a) dehydrating agent (c) both ionic end and carbon chain are in the
19. Oils on treating with hydrogen in the presence of of the cluster.
palladium or nickel catalyst form fats. This is an
(d) both ionic end and carbon chain are on the exterior
example of of the cluster.
(a) Addition reaction
27. Pentane has the molecular formula C&H2. It has
(b) Substitution reaction (b) 12 covalent bonds
(a) 5 covalent bonds
(c) Displacement reaction
(c) 16 covalent bonds (d) 17 covalent bonds
(a) Oxidation reaction
20. In which of the following compounds, -OH is the 28. Structural formula of benzene is
functional group ?
H H
(a) Butanone (b) Butanol
(c) Butanoicacid (d) Butanal
H H
21. The soap molecule has a H-C C-H
H
H
(a) hydrophilic head and a hydrophobic tail (a) H H H
C-H
(b) hydrophobic head and a hydrophilic tail H HZ H
(c) hydrophobic head and a hydrophobic tail
(d) hydrophilic head and a hydrophilic tail H H
H
2. Which of the following is the correct representation
of electron dot structure of nitrogen ?
H
(a) :N:N: b) :N::N: H

(c) :N: N: (d) N::N

Structural formula of ethyne is C-H H-C
(c) H
(d)
(a) H-C=C--H (b) H,C-C=C-H H- H
-H
C-H
H. H H H
(c) (a)
H
H H H H
Carbon and its Compounds
85
29. Ethanol reacts with sodium and forms two products. 34. The correct electron dot structure of a water
These are molecule is
(a) sodium ethanoate and hydrogen
b) sodium ethanoate and Oxygen (a) H--H 0) H:0-H
(c) sodium ethoxide and hydrogen (c) H:0:H (d) H:0:H
(d) sodium ethoxide and oxygen Competency
Questions
Based
35. Which of the following is not a straight chain
hydrocarbon ?
30 The correct structural formula of butanoic acid is
(a) H,C-CH,-CH,-CH,-CH,
(a) H-C-C=C-C-OH CH3
H b) H,C-CH,CH,-CH,-CH,
H H H H O
CH3
(b) H-C-C-C-C-C-OH (c) H,C H,C H,C-CH,
CH
H H H H H
CH3
HH H H
CH-CH,-CH,-CH,
II!! H,C.
H H H H
36. Which among the following are unsaturated
hydrocarbons ?
H H H O () H,C-CH,-CH,-CH,
id) H-C-C-C-C-OH (ii) H,C--C=C-CH

H H H
(iüi) H,C- CH-CH3
31. Vinegar is a solution of CH3
(a) 50 % 60 % acetic acid in alcohol (iv) H,CC= CH,
6) 5 %-8% acetic acid in alcohol CH3
(c) 5 % -8% acetic acid in water (a) (i) and (iii) (b) (ü) and (ii)
d) 50 % 60 % acetic acid in water (c) (ii) and (iv) (a) (iüi)and (iv)
32. Mineral acids are stronger acids than carboxylic
37. Which of the following does not belong to the same
acids because
homologous series ?
(i) mineral acids are completely ionised
(a) CH, (6) CH,
(ii) carboxylic acids are completely ionised (c) CzHg
(üi) mineral acids are partially ionised 38. The name of the compound CH-CH,-CHO is
(iv) carboxylic acids are partially ionised (a) Propanal (b) Propanone
(a) (i) and (iv) (b) (üi) and (iii) (c) Ethanol (d) Ethanal
(c) (i)and (iü) (a) (ii) and (iv) 39. The hetero atoms present in
33. Carbon forms four covalent bonds by sharing its CH,-CH,-0-CH,CH,-Cl are
four valence electrons with four univalent atoms,
(ü) carbon
e.g., hydrogen. After the formation of four bonds, () Oxygen
carbon attains the electronic configuration of (iti) hydrogen (iv) chlorine
(a) helium (b) neon (a) (i) and (ii) (b) (ii) and (ii)
(c) argOn (d) krypton (c) (ii) and (iv) (d) (i) and (iv)
 Competency Based Questions
46. 44.
Soft 45. 3. d1.
86
carbonate
Sodium
icarbonate
sodiumPorassiun
(d) chloride
(c) (b) (a)water
hardName: (d) lc) (b) {aj water In (d) (c) blackened ketoneButanone
(b) (a) While Carboxylic (c) acid(a) (c) Ethane
(a) propyTeethyne
ic) K2) The
kd(C) b) reaction
ka) Which?
AA A A the 6
Calciun The The The The CH;COOC,H, CH;COONa
+ covalent 8has first 2CH,COORCH;COOH
of is 1s
clear S $olutions0ap given cooking with
lather,
precipitate, Scum, fuel fuel fuel food isa covalent member of
the in the
hydrogen solution, A-> Test is is is is the
salt four bondsmolecular
B B burning wet. not not
is tubes outside, if bonds of +
from is burningcooked bottom carbon + 2
+CHOH + following
scum B lather alkyne NaOH Na NaOH
carboate is isB Hard completely
: alcohol formula
(d) (b) methane
(aethene
) (b)
the scum lather it aldehyde
(d) (6)
compound
water
completely
completelymeans of covalent
bonds 9 7
following (N.C.E.R.T.
Textbook) covalent homologous CH,COONa 2 Ca0,
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+
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saponification
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makes IS H2

51. 50. 49. 48. 47.

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Cal(c) cium(a) turns
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62. 61. 60. 5).

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