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CBSE Questions for Class 10 Chemistry Carbon And Its Compounds Quiz 9 - MCQExams.com

______ is the perfectly crystalline allotrope of carbon.
  • Coal
  • Coke
  • Diamond
  • Wood
Graphite is a conductor of electricity because
  • it has free valence electrons.
  • it is a non-metal form of carbon.
  • it is an allotrope of carbon.
  • Both A and B.
An element X has 6 electrons in its outermost shell. Then the number of electrons shared by X with another atom to form a covalent bond is:
  • 3
  • 2
  • 6
  • 4
CH4 is a /an _____________ compound.
  • Ionic
  • Covalent
  • Both a and b 
  • None of these
The formula of methane is CH4 and its succeeding member ethane is expressed in C2H6. The common difference of succession between them is:
  • CH2
  • C2H2
  • CH4
  • None of the above
Among the given compounds, which can have triple bond?
C2H4C3H4, C3H6.
  • C2H4
  • C3H4
  • C3H6
  • All of these
Valency of carbon is:
  • 1
  • 4
  • 3
  • 2
In a covalent bond formation:
  • transfer of electrons takes place
  • sharing of electrons between two atoms takes place
  • electrons are shared by one atom only
  • electrons are donated by one atom and shared by both atoms.
C3H6,C4H8 and C5H10 belong to the same homologous series. The melting and boiling points of C5H10 are higher than that of C4H8.
  • True
  • False
The chlorination of methane is an example of:
  • addition
  • elimination
  • substitution
  • None of the above
In the given figure label the parts.
933722_9e52155190484182bd4185fbeb69b671.JPG
  • A - Hydrophilic tail, B - hydrophobic head
  • A - Hydrophobic tail, B - hydrophobic head
  • A - Hydrophobic tail, B - hydrophilic head
  • A - Hydrophilic tail, B - hydrophilic head
Washing soaps produce scum with hard water and not much foam because hard water contains:
  • chalk and sulphur
  • many dissolved inorganic salts
  • many suspended particles
  • organic matter
A group closely related compounds which can be expressed by a general formula & in which two consecutive members differ by 14 in their molecular masses is called:
  • a heterogeneous series
  • a homologous series
  • a homogeneous series
  • a electrochemicals series
In homlogous series, successive members differ by:
  • CH3
  • CH3CH2
  • CH2
  • H
In the presence of the acid catalyst, ethanoic acid reacts with ethanol to produce________.
  • ethanol
  • ethanoic
  • ethyl ethanote
  • ethyl ethanol
                            CH3    CH3
H3CCH2|CH|CHCH3

Write the IUPAC name of the given compound.
  • 2,3-dimethylpentane
  • 3,4-dimethylhexane
  • 2-sec-butylbutane
  • 2,3-dimethylbutane
HH|C|HH|C|HH|C|OHH         HH|C|HH|C|HOH         HH|C|HH|C|HH           H|C|H=H|C|H  
          
                 (1)                                 (2)                                   (3)                           (4)
              
The structures of four molecules are shown.

Which molecules belong to the same homologous series?
  • 1 and 2
  • 1 and 3
  • 2 and 4
  • 3 and 4
Which pollutant gas can be produced as a result of incomplete combustion of octane (C8H18)?
  • Carbon
  • Carbon dioxide
  • Carbon monoxide
  • Methane
_________ is/are a major component of shampoos and soaps.
  • Li
  • Na
  • K
  • Fr
Which pair of statements about diamond and graphite is correct?
1643506_25371ada391642fabcc444a460f61251.png
  • Diamond and graphite are both pure carbon. They are both macromolecules.
  • Diamond and graphite can both be used as electrodes. Graphite is also used as a lubricant
  • Diamond has covalent bonds. Graphite has ionic bonds.
  • Diamond is hard with a high melting point. Graphite is soft with a low melting point.
Which statement about bonding is not correct?
  • Carbon can form covalent bonds.
  • Chlorine atoms react to gain a noble gas electronic configuration.
  • Covalent bonding involves losing and gaining electrons.
  • Hydrogen molecules have the formula H2.
State whether the following statement is true or false :
A soap contains only hydrophilic part while a detergent consist only hydrophobic part in the molecule.
  • True
  • False
Soap are the salts of higher fatty acids.
  • True
  • False
Soft soap are
  • Sodium salt
  • Calcium salt
  • magnesium salt
  • potassium salt
Soaps are sodium or potassium salts of carboxylic acids.
  • True
  • False
State whether the following statement is True or False;

Tartaric acid has two asymmetric carbon atoms.
  • True
  • False
Rectified spirit is a mixture of:
  • 95% ethyl alcohol + 5% water
  • 94% ethyl alcohol + 4.53% water
  • 94.4% ethyl alcohol + 5.43 % water
  • 95.57% ethyl alcohol + 4.43% water
The complete combustion of hydrocarbon produces
  • CO+H2
  • CO+N2
  • CO2+H2O
  • CO+N2O
When two pairs of electrons are shared, bond is 
  • Single covalent bond
  • Double covalent bond
  • Dative bond
  • Triple bond
Identify the unsaturated compounds from the following
(i) Propane
(ii) Propene
(iii) Propyne
(iv) Chloropropane
  • (i) and (ii)
  • (ii) and (iv)
  • (iii) and (iv)
  • (ii) and (iii)
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