Download App

Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds5 Marks
Question
An organic compound A on heating with concentrated H2SO4 forms a compound B which on addition of one mole of hydrogen in presence of Ni forms a compound C. One mole of compound C on combustion forms two moles of CO2 and 3 moles of H2O. Identify the compounds A, B and C and write the chemical equations of the reactions involved.
✓

Answer

Since one mole of compound C on combustion forms two moles of CO2 and three moles of H2O the compound C is a hydrocarbon with formula C2H6. It is ethane. The compound B which forms C2H6 upon addition of hydrogen is ethene (C2H4). The organic compound A which forms ethene upon acidic dehydration is ethanol. The chemical equations for the reactions involved are:

$\text{C}_2\text{H}_5\text{OH}\xrightarrow[\ \ \ \text{heat}\ \ \ ]{\ \text{H}_2\text{SO}_4\ }\text{CH}_2=\text{CH}_2\xrightarrow[\ \ \text{heat}\ \ \ ]{\ \ \text{H}_2\text{Ni}\ \ }\text{CH}_3-\text{CH}_3\\\text{Ethanol (A)}\ \ \ \ \ \ \ \ \ \text{Ethene (B)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Ethane (C)}$

$\text{C}_2\text{H}_6+3\text{O}_2\xrightarrow{\ \ \ \ (\text{Combustion})\ \ \ }2\text{CO}_2+3\text{H}_2\text{O}\\\ \ (\text{C)}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the questions.[Che-5M]" from Carbon and its Compounds→Carbon and its Compounds — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Explain why, a salt which does not conduct electricity in the solid state becomes a good conductor in molten state.
→
Esters are 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.
→
State one use each of the following metals:
Copper, Aluminium, Iron, Silver, Gold, Mercury
→
Draw the electron-dot structures of the following compounds and state the type of bonding in each case:
  1. CO2
  2. MgO
  3. H,O
  4. HCl
  5. MgCl2
→
A non-metal A which is the largest constituent of air, when heated with H2 in 1 : 3 ratio in the presence of catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D which acts as a strong oxidising agent.
  1. Identify A, B, C and D.
  2. To which group of periodic table does this non-metal belong?
→
State any five physical properties of metals and five physical properties of non-metals.
→
During the reaction of some metals with dilute hydrochloric acid, following observations were made.

  1. Silver metal does not show any change.
  2. The temperature of the reaction mixture rises when aluminium (Al) is added.
  3. The reaction of sodium metal is found to be highly explosive.
  4. Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

→
i. What are soaps? Explain the mechanism of cleansing action of soap with the help of a labelled diagram.
ii. Detergents are better than soaps. Justify.
→
Write the names and symbols of two very reactive metals belonging to group 1 of the periodic table. Explain by drawing electronic structure, how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.
→
  1. Given below are the steps for extraction of copper from its ore. Write the reaction involved.
    1. Roasting of copper (1) sulphide.
    2. Reduction of copper (1) oxide with copper (1) sulphide.
    3. Electrolytic refining.
  2. Draw a neat and well labelled diagram for electrolytic refining of copper.
→