HS/I/CC/03 Student's Copy
2 0 1 8
CBCS
1st Semester
HOME SCIENCE
Paper HS-103
Chemistry
Full Marks 75
Time 3 hours
PART A—OBJECTIVE
Marks 25
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 10
Tick the correct answer in the brackets provided 1×10=10
1. The general formula of alkene is
CnH2n CnH2n+1
CnH2n+2 CnH2n-2
2. Which of the following is also known as fire damp?
Butane Methane
Ethane Propane
3. pH of alkane solution is
above below 7
equal to 7 equal to 0
4. General formula of alkyl halide is
R—R R—H
R—O R—X
/29 1 Contd.
5. The acid which is most abundant in lemon fruit is
acetic acid oxalic acid
citric acid tartaric acid
6. Methyl alcohol is also called
wood alcohol rectified spirit
grain alcohol power alcohol
7. —— is used as a general antiseptic.
Acetone Acetaldehyde
Formaldehyde Chloral
8. C 0 functional group is named as
carbonate group carboxylic group
carbonyl group carbohydrate group
9. An acid, one molecule of which contains two replaceable hydrogen atom is a
monobasic acid dibasic acid
tribasic acid tetrabasic acid
10. Molecular formula of sodium carbonate is
NaCO3 Na2CO3
Na 3CO3 Na4CO3
SECTION—B
Marks 15
Answer the following questions 3×5=15
UNIT—I
1. What are oxidation and reduction?
OR
What is chemical equation? Give example.
UNIT—II
2. Describe the preparation of methane from methyl iodide.
OR
What is ethane? Describe the structural formula of ethane.
UNIT—III
3. What are alkyl halides? Write two important physical properties of methyl
iodide.
OR
What is glycerol? Write two important physical properties of glycerol.
HS/I/CC/03/29 2 Contd.
UNIT—IV
4. What are aldehyde and ketones? Give example of each.
OR
Write three important uses of acetone.
UNIT—V
5. What is oxalic acid? Describe the structural formula of oxalic acid.
OR
Write three important physical properties of tartaric acid.
PART B—DESCRIPTIVE
Marks 50
The figures in the margin indicate full marks for the questions
UNIT—I
1. Define the following 1×4=4
Diffusion
Atom
Molecule
Molecular formula
Calculate the equivalent weight of sulphuric acid (atomic wt. H
S 32, O 16). 3
Differentiate between normality and molarity with example. 3
OR
What are oxidizing and reducing agents? Give examples of each. 4
Calculate the amount of H2SO4 required to prepare 0·2 N in 250 ml
(mel. ert. of H2SO4 is 98). 3
What are pH and buffer solution? 3
UNIT—II
2. How will you detect the presence of carbon and nitrogen in an organic
compound? 4
What are the three important uses of ethane? 3
What happens when ethane reacts with nitric acid? Write the equation
involved. 3
OR
What are hydrocarbons? Differentiate between saturated and
unsaturated hydrocarbons. Give example of each. 4
HS/I/CC/03/29 3 Contd.
Write IUPAC names of the following 1×3=3
CH CH
CH
3 CH2 CH3
3
— — —
CH3 —CH =CH2
H — C — H
Write three physical properties of methane. 3
UNIT—III
3. Describe laboratory method for the preparation of methyl iodide. 4
What is ethyl iodide? Write two physical properties of ethyl iodide.

What is Williamson's synthesis? Write the equation involved. 3
OR
What are alcohols? How is methyl alcohol can be prepared from water
gas?
Write three important physical properties of ethyl alcohol. 3
Write three important uses of glycerol. 3
UNIT—IV
4. What is formaldehyde? Describe laboratory preparation of
formaldehyde.
What happens when formaldehyde reacts with sodium hydroxide?
Write the equation. 3
Write three important uses of formaldehyde. 3
OR
What is acetone? How acetone can be prepared by oxidation of
isopropyl alcohol?
Describe the structural formula of acetone. 3
Write the three physical properties of acetone. 3
UNIT—V
5. What is carboxylic acid? Describe one method for the preparation of
acetic acid.
Write the three important uses of oxalic acid. 3
Mention the three physical properties of oxalic acid. 3
OR
What is citric acid? How is citric acid prepared from molasses?
Write the three physical properties of citric acid. 3
What are the three important uses of tartaric acid? 3