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a. Multiple Choice Questions
b. Two Marks Questions
c. Long answer questions(5 Marks)
Multiple Choice Questions
Question 1.
Which part of a soap molecule is attracted to water?
(a) Hydrophobic tail
(b) Hydrophilic head
(c) Both
(d) Neither Question 2.
What structure do soaps form to trap dirt and grease?
(a) Crystals
(b) Micelles
(c) Polymers
(d) Fibers Question 3.
Which base is commonly used in the saponification process?
(a) HCl
(b) NaOH
(c) $H_2SO_4$
(d) $NH_3$ Question 4
What type of reaction occurs when ethanoic acid reacts with alcohol?
(a) Esterification
(b) Oxidation
(c) Reduction
(d) Substitution Question 5.
Which of the following is NOT a property of most carbon compounds?
(a) Low melting and boiling points
(b) Poor conductors of electricity
(c) Form ions
(d) Formed by sharing valence electrons Question 6.
What is the structure of benzene?
(a) Cyclic with single bonds
(b) Cyclic with double bonds
(c) Cyclic with triple bonds
(d) Linear with double bonds Question 7.
Pentane has the molecular formula C5H12. It has
(a) 5 covalent bonds
(b) 12 covalent bonds
(c) 16 covalent bonds
(d) 17 covalent bonds Question 8.
What is the formula for cyclohexane?
(a) $C_6H_{10}$
(b) $C_6H_8$
(c) $C_6H_6$
(d) $C_6H_{12}$ Answers
1. b
2. b
3. b
4. a
5. c
6. b
7. c
8. d
Short Answer type
Question 1.
Explain why carbon generally forms compound by covalent bonds? Answers
Carbon has 4 valence electron.It could gain four electrons forming C4– anion. But it would be difficult for the nucleus with six protons to hold on to ten electrons, that is, four extra electrons.
It could lose four electrons forming C4+ cation. But it would require a large amount of energy to remove four electrons leaving behind a carbon cation with six protons in its nucleus holding on to just two electrons.
Carbon overcomes this problem by sharing its valence electrons with other atoms of carbon or with atoms of other elements. hence forming covalent bonds
Question 2.
To which group ethanoic acid belongs? How it differs from vinegar? Question 3.
What is esterification? Question 4.
What is the basic principle behind the action of soaps and detergents? Question 5.
How carboxylic acids are generally categoried? How these differ from other mineral acids? Question 6.
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also? Question 7.
An organic compound burns with a sooty flame? Is it a Saturated or an unsaturated compound?
Long Answer type
Question 1.
Draw the structure of the following compounds –
Butanoic acid
Bromopantane
Butyne
Question 2.
State reason to explain why covalent compounds –
are bad conductor of electricity?
have low melting point and boiling point?
Question 3.
Write the names of the following carbon compounds ad draw their structures?
CH3COCH3
CH3CH2Br
C6H6
Question 4.
What are oxidizing agent? State two oxidizing agent. Write one chemical equation using oxidizing agent? Question 5.
(i) Why ethanoic acid is called glacial acetic acid?
(ii)Write balanced chemical equation of reaction of ethanoic acid with sodium hydrogen Carbonate? Question 6.
Describe an activity to prepare an ester in laboratory with a well labeled diagram? Question 7.
Why is hard water not suitable for washing clothes with soap? Question 8.
Give a chemical test to distinguish between alcohol and carboxylic acid? Question 9.
Suggest one method to remove the temporary hardness of water? Question 10.
Name the gas evolved when ethanoic acid is added to sodium carbonate. How would you prove the presence of this gas? Question 11.
Describe along with chemical equation, what happen when –
Ethene react with bromine water.
Ethanol burns in air.
Ethanoic acid reacts with ethanol in presence of sulphuric acid?
Question 12.
Under what conditions an oxidation reaction can be called as combustion reaction? Illustrate you answer with examples? Question 13.
Complete the following equation-
CH3COOC2H5___________
CH3COOH + NaHCO3 ___________
CH4 + Cl2____________
Question 14.
An organic compound A on heating with concentrated H2SO4 forms a compound B which an addition of one mole of hydrogen in presence on Ni forms a compound C. One mole of compound C on combustion form two moles of CO2 and 3 mole of H2O. Identify the compounds A, B and C. Write the chemical equations of the reactions involved. Question 15.
How can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties? Question 16.
Explain why carbon forms compounds mainly by covalent bed. Explain in brief two main reasons for carbon forming a large number of compounds. Why does carbon form strong bonds with most other element? Question 17.
Describe the addition reaction of carbon compounds with its use. State the function of catalyst in this reaction?
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