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Science [2 Mark Questions]

Carbon and its Compounds · CBSE STD 10 (CBSE - English Medium). 9 questions.

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[2 Mark Questions]

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9 questions · timed · auto-graded

Question 12 Marks
Explain the given reaction with the example:Oxidation reaction.
Answer
When oxygen is added to alcohol to make carboxylic acid, this is called oxidation reaction. Following is an example of oxidation of alcohol.$\text{CH}_3\text{CH}_2\text{CH}_2\text{OH}\xrightarrow{\ \ \text{alk KMnO}_4/\alpha\ \text{idified K}_2\text{Cr}_2\text{O}_7}\text{CH}_3\text{CH}_2\text{COOH}$
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Question 22 Marks
Explain the given reaction with the example:Saponification reaction.
Answer
When ester is treated with an alkali, the reaction gives ethanol and sodium ethanoate. This reaction is called saponification reaction because this reaction forms the basis of preparation of soap. This can be given by following equation.
$CH _3 COOC _2 H _5+ NaOH \rightarrow CH _3 COONa + C _2 H _5 OH$
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Question 32 Marks
Explain the given reaction with the example:Hydrogenation reaction.
Answer
Addition of hydrogen to unsaturated hydrocarbon to obtain a saturated hydrocarbon is called hydrogenation reaction. Hydrogenation is used for converting unsaturated vegetable oil into fat. This can be shown by following equation:$\text{R}_2\text{C}=\text{CR}_2+\text{H}_2\xrightarrow{\ \ \ \text{Ni}\ \ \ }\text{R}_2\text{C}-\text{CR}_2\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{H}\ \ \ \ \ \text{H}$
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Question 42 Marks
Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements.
Write an example of a compound formed with,
  1. Chlorine (Group 17 of Periodic Table)
  2. Oxgygen (Group 16 of Periodic Table)
Answer
a. The compound is carbon tetrachloride $\left( CCl _4\right)$
b. The compound is carbon dioxide $\left( CO _2\right)$
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Question 52 Marks
A gas is evolved when ethanol reacts with sodium. Name the gas evolved and also write the balanced chemical equation of the reaction involved.
Answer
When ethanol reacts with sodium, then hydrogen gas is evolved. This reaction can be given by following equation:2Na + $2 Na +2 CH _3 CH _2 OH \rightarrow 2 CH _3 CH _2 ONa + H _2$
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Question 62 Marks
What is saponification? Write the reaction involved in this process.
Answer
When ester treated with an alkali, the reaction gives ethanol and sodium ethanoate. This reaction is called saponification reaction because this reaction forms the basis of preparation of soap. This can be given by following equation.
$CH _3 COOC _2 H _5+ NaOH \rightarrow CH _3 COONa + C _2 H _5 OH$
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Question 72 Marks
Explain the given reaction with the example:Substitution reaction.
Answer
Saturated hydrocarbons are fairly unreactive. But in the presence of sunlight, chlorine substitutes hydrogen one by one.
$CH _4+ Cl _2 \rightarrow CH _3 Cl + HCl$ (in the presence of sunlight)
This substitution can go on till, carbon tetrachloride is obtained.
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Question 82 Marks
Catenation is the ability of an atom to form bonds with other atoms of the same element. It is exhibited by both carbon and silicon. Compare the ability of catenation of the two elements. Give reasons.
Answer
Both carbon and silicon show the ability of catenation. But compounds made by silicon are reactive and less stable. On the other hand, bonds formed by carbon are very strong and hence organic compounds are more stable than silicon compounds. It can be said that carbon shows better catenation ability than silicon.
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Question 92 Marks
Explain the given reaction with the example:Combustion reaction.
Answer
When a substance burns in the presence of oxygen, the reaction is called combustion. Following is an example of combustion reaction.
$CH _4+ O _2 \rightarrow CO _2+ H _2 O +$ heat and light
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[2 Mark Questions] - Science STD 10 Questions - Vidyadip