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Class 10 Science
Carbon And Its Compounds
Quiz 1
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Carbon exists in the atmosphere in the form of
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carbon monoxide only
0%
carbon monoxide in traces and carbon dioxide
0%
carbon dioxide only
0%
coal
Explanation
carbon monoxide in traces and carbon dioxide
Graphite is used as a lubricant in machines because
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it is a good conductor of electricity.
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it has a high melting point and slippery layers.
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its density ranges from 1. 9 to 2. 3 g/cm
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it is strong and soft.
Explanation
it has a high melting point and slippery layers.
The allotrope of carbon which is a good conductor of heat and electricity is
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diamond
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graphite
0%
charcoal
0%
none of these
Explanation
graphite
Which of the following is not considered as crystalline allotrope of carbon?
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Coal
0%
Diamond
0%
Graphite
0%
Fullerence
Explanation
Coal
Which form of carbon is found in Golkonda mines of Karnataka?
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Diamond
0%
Graphite
0%
Coal
0%
Coke
Explanation
Diamond
Lead pencil contains
0%
graphite
0%
diamond
0%
lead
0%
lead sulphate
Explanation
graphite
Mineral acids are stronger acids than carboxylic acids because
0%
(i) and (iv)
0%
(ii) and (iii)
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(i) and (ii)
0%
(iii) and (iv)
Explanation
(i) and (iv)
A few drops of ethanoic acid were added to solid sodium carbonate. The observation made was that
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a hissing sound was produced
0%
brown fumes evolved
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brisk effervescence occurred
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a pungent smelling gas evolved
Explanation
brisk effervescence occurred
A reagent which can help us to distinguish between alkenes and alkynes is:
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Bromine water
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Carbon tetrachloride
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Alkaline KMnO
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Ammoniacal cuprous chloride
Explanation
Ammoniacal cuprous chloride
The correct structural formula of butanoic acid is
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a
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b
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c
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d
Explanation
d
The soap molecule has a
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hydrophilic head and a hydrophobic tail
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hydrophobic head and a hydrophilic tail
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hydrophobic head and a hydrophobic tail
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hydrophilic head and a hydrophilic tail
Explanation
hydrophilic head and a hydrophobic tail
Detergents can be used for washing of clothes
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only in hard water
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only in soft water
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both in soft and hard water
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None of the above
Explanation
both in soft and hard water
Which among the following are unsaturated hydrocarbons?
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(i) and (iii)
0%
(ii) and (iii)
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(ii) and (iv)
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(iii) and (iv)
Explanation
(ii) and (iv)
Acetic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y was evolved. The gas was passed through lime water, which turned milky. It was concluded that
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solid X is sodium hydroxide and the gas Y is CO
2
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solid X is sodium bicarbonate and the gas Y is CO
2
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solid X is sodium acetate and the gas Y is CO
2
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solid X is sodium bicarbonate and the gas Y is SO
2
.
Explanation
solid X is sodium bicarbonate and the gas Y is CO
2
Pentane has the molecular formula C
5
H
12
. It has
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5 covalent bonds
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12 covalent bonds
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16 covalent bonds
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17 covalent bonds
Explanation
16 covalent bonds
Structural formula of ethyne is
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a
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b
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c
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d
Explanation
a
A student while observing the properties of acetic acid would report that this smells like
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vinegar and turns red litmus blue
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rotten egg and turns red litmus blue
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vinegar and turns blue litmus red
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rotten egg and turns blue litmus red
Explanation
vinegar and turns blue litmus red
Vinegar is a solution of
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50% – 60% acetic acid in alcohol
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5% – 8% acetic acid in alcohol
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5% – 8% acetic acid in water
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50% – 60% acetic acid in water
Explanation
5% – 8% acetic acid in water
The portion left on dropping a hydrogen atom from an alkane is called
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functional group
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alkenyl group
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alkyl group
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phenyl group
Explanation
alkyl group
The functional group present in a carboxylic acid is
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a
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b
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c
0%
d
Explanation
b
0 h : 0 m : 1 s
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