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Science Answer the questions.[Che-1M]

Carbon and its Compounds · CBSE STD 10 (CBSE - English Medium). 276 questions.

Questions · Page 1 of 6

Answer the questions.[Che-1M]

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Question 11 Mark
Write the structural formula of propyne.
Answer
$\ \ \ \ \ \ \ \ \text{H}\\ \ \ \ \ \ \ \ \ \ \text{|}\\ \text{H} - \text{C}- \text{C}\equiv \text{C}-\text{H}\\ \ \ \ \ \ \ \ \ \ \text{}| \\ \ \ \ \ \ \ \ \ \text{H}$
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Question 21 Mark
Write the structural formula of propyne.
Answer
$\ \ \ \ \ \ \ \ \text{H}\\ \ \ \ \ \ \ \ \ \ \text{|}\\ \text{H} - \text{C}- \text{C}\equiv \text{C}-\text{H}\\ \ \ \ \ \ \ \ \ \ \text{}| \\ \ \ \ \ \ \ \ \ \text{H}$
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Question 51 Mark
Write the structural formula of butane.
Answer
$\ \ \ \ \ \ \ \ \text{H} \ \ \ \ \ \text{H} \ \ \ \ \text{H} \ \ \ \ \ \text{H}\\ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|}\\ \text{H} - \text{C}-\text{C}-\text{C}-\text{C}-\text{H} \\ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|} \\ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \text{H} \ \ \ \ \ \text{H} \ \ \ \ \ \text{H}$
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Question 61 Mark
Write the structural formula of butane.
Answer
$\ \ \ \ \ \ \ \ \text{H} \ \ \ \ \ \text{H} \ \ \ \ \text{H} \ \ \ \ \ \text{H}\\ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|}\\ \text{H} - \text{C}-\text{C}-\text{C}-\text{C}-\text{H} \\ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|} \\ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \text{H} \ \ \ \ \ \text{H} \ \ \ \ \ \text{H}$
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Question 71 Mark
Write the names of the following functional groups:
  1. $-\text{C}\equiv\text{C}-$
  2.  

Answer
  1. Alkyne.
  2. Alkene.
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Question 81 Mark
Write the names of the following functional groups:
  1. $-\text{C}\equiv\text{C}-$
  2.  

Answer
  1. Alkyne.
  2. Alkene.
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Question 91 Mark
Write the names of any two isomers represented by the molecular formula C5H2.
Answer
Isopentane and neopentane.
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Question 101 Mark
Write the names of any two isomers represented by the molecular formula C5H2.
Answer
Isopentane and neopentane.
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Question 111 Mark
Write the name and formula of an organic compound containing a ketone functional group.
Answer
Acetone: CH3COCH3
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Question 121 Mark
Write the name and formula of an organic compound containing a ketone functional group.
Answer
Acetone: CH3COCH3
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Question 151 Mark
Write the molecular formula of the third member of the homologous series of carbon compounds with general formula CnH2n+1OH.
Answer
C3H7OH
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Question 161 Mark
Write the molecular formula of the third member of the homologous series of carbon compounds with general formula CnH2n+1OH.
Answer
C3H7OH
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Question 191 Mark
Write the molecular formulae of the third and fifth members of homologous series of carbon compounds represented by the general formula CnH2n+2.
Answer
Third member: C3H8
Fifth member: C5H12
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Question 201 Mark
Write the molecular formulae of the third and fifth members of homologous series of carbon compounds represented by the general formula CnH2n+2.
Answer
Third member: C3H8
Fifth member: C5H12
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Question 231 Mark
Write the IUPAC names of the following:
  1. HCHO
  2. CH3CHO
  3. CH3CH2CHO
  4. CH3CH2CH2CHO
Answer
  1. Methanal.
  2. Ethanal.
  3. Propanal.
  4. Butanal.
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Question 241 Mark
Write the IUPAC names of the following:
  1. HCHO
  2. CH3CHO
  3. CH3CH2CHO
  4. CH3CH2CH2CHO
Answer
  1. Methanal.
  2. Ethanal.
  3. Propanal.
  4. Butanal.
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Question 271 Mark
Write the IUPAC names, common names and formulae of the first two members of the homologous series of carboxylic acids.
Answer
IUPAC name
Comman name
Formula
Methanoic acid
Formic acid
HCOOH
Ethanoic aicd
Acetic acid
CH3COOH
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Question 281 Mark
Write the IUPAC names, common names and formulae of the first two members of the homologous series of carboxylic acids.
Answer
IUPAC name
Comman name
Formula
Methanoic acid
Formic acid
HCOOH
Ethanoic aicd
Acetic acid
CH3COOH
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Question 311 Mark
Write the formula of the functional group present in carboxylic acids.
Answer
The formula of the functional group present in carboxylic acids is R-COOH (where, R is an alkyl group).
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Question 321 Mark
Write the formula of the functional group present in carboxylic acids.
Answer
The formula of the functional group present in carboxylic acids is R-COOH (where, R is an alkyl group).
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Question 331 Mark
Write the formulae of:
  1. Methanoic acid.
  2. Ethanoic acid.
Answer
  1. Methanoic acid: HCOOH
  2. Ethanoic acid: CH3COOH
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Question 341 Mark
Write the formulae of:
  1. Methanoic acid.
  2. Ethanoic acid.
Answer
  1. Methanoic acid: HCOOH
  2. Ethanoic acid: CH3COOH
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Question 371 Mark
Write the chemical equation of the reaction which takes place during the burning of ethanol in air.
Answer
$\text{C}_2\text{H}_5\text{OH}+3\text{O}_2\xrightarrow[{(\text{Burning})}]{{ \ \ \ \ \ \ \ \ \ \ \ \ \text{Combution}}\ \ \ \ \ \ \ \ \ \ \\}2\text{CO}_2+3\text{H}_2\text{O}+\text{Heat}+\text{Light}$
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Question 381 Mark
Write the chemical equation of the reaction which takes place during the burning of ethanol in air.
Answer
$\text{C}_2\text{H}_5\text{OH}+3\text{O}_2\xrightarrow[{(\text{Burning})}]{{ \ \ \ \ \ \ \ \ \ \ \ \ \text{Combution}}\ \ \ \ \ \ \ \ \ \ \\}2\text{CO}_2+3\text{H}_2\text{O}+\text{Heat}+\text{Light}$
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Question 411 Mark
Write down:
  1. Structural formula.
  2. Electron-dot formula, of any one isomer of hexane(C6H14), other than n-hexane.
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Question 421 Mark
Write down:
  1. Structural formula.
  2. Electron-dot formula, of any one isomer of hexane(C6H14), other than n-hexane.
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Question 431 Mark
Would you be able to check whether water is hard by using a detergent? Why?
Answer
No, we would not be able to check the hardness of water by using a detergent because a detergent forms lather easily even with hard water.
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Question 441 Mark
Would you be able to check whether water is hard by using a detergent? Why?
Answer
No, we would not be able to check the hardness of water by using a detergent because a detergent forms lather easily even with hard water.
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Question 451 Mark
Why is graphite used for making dry cell electrodes but diamond is not?
Answer
Graphite is used for making dry cell electrodes but diamond is not because graphite is a good conductor of electricity whereas diamond is a bad conductor of electricity.
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Question 461 Mark
Why is graphite used for making dry cell electrodes but diamond is not?
Answer
Graphite is used for making dry cell electrodes but diamond is not because graphite is a good conductor of electricity whereas diamond is a bad conductor of electricity.
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Question 471 Mark
Why is ethanol used as a fuel?
Answer
Since, ethanol burns with a clear flame giving a lot of heat, therefore, it is used as a fuel.
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Question 481 Mark
Why is ethanol used as a fuel?
Answer
Since, ethanol burns with a clear flame giving a lot of heat, therefore, it is used as a fuel.
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Question 491 Mark
Why is diamond used for making cutting tools (like glass cutters) but graphite is not?
Answer
Diamond used for making cutting tools but graphite is not because diamond is a very hard substance and graphite is a soft substance.
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Question 501 Mark
Why is diamond used for making cutting tools (like glass cutters) but graphite is not?
Answer
Diamond used for making cutting tools but graphite is not because diamond is a very hard substance and graphite is a soft substance.
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