Bhavik

S. Thomas School, Jagadhri

Pre Board Examinations 2023-24
\ -Chemistry Science
Paper - 2
Max. Marks: 80
Time: 2Hours
General Instructions:
separately.
1. Answer tothis P'aper must be written onthe paper provided
2. Youwill not bc allowed to write during first |5 minutes.
3. This time is to be spent in reading the question paper.
aliowed for writing the answers.
4. The time given at the head of this Paper is the time
from Section B.
S. Section A is compulsory. Attempt any four questions
given in brackets .
6. The intended marks for qucstions or parts of questionsarc

SECTION - A
(Atempt all questions from this Section.)

QUESTION 1.
[15](Do not copy the
Choose the correct answers to the questions from the given options.
questions, write thecorrect answer only.)
molten lead bromide.
ildentify one statement that holds true for electrolysis of
a. Silver grey metal deposits at the anode.
b -Temperature is not maintained during electrolysis.
anode.
Brown vapours of bromine are obtained at the
d. Electrolyte contains Hions along with Pb ions.

ii. If the pH of a solution is 2. then the solution is a

ta strong acid (b) strong alkali
(c) wcak acid (d)weak alkali

the increasing order of ionisation

iii. In a periodictable. theelement of period 3are arranged in
potentialas
a. B. N.CI, Ar
Mg, Si, S, Ar
C. Ar, Si, S, Mg
d. Si. Ar. Cl. Mg
solution of an acid and of a base?
iv. Which of the following statements is correct about an aqueous
() Higher the pBi, stronger the acid (ii) Higher the plH, veaker the acid
(iv)Lower the pll. weaker the base
(iii) Lower the pl1, stronger the base
(a) (i),and (ii) (b) (ii) and (iii)
i)and (iv) (d)(i) and (iv)
afinity is
V. Among the elements of period 2, the element which has high electron
(a) fluorine (b) carbon
sorchlorine (d) lithium

QOrde
 clectrolyte?
aveak
folloving is
Which ofthe (b Ammonium
Beyene acctate
(a)Sodiun chloride
() Sodiumacctate.

to 100 imes its pll willbe

10^MHCis divided 6 9S
vi. dilted
(b)8.0
(c)9.5 ().95
similar to
clectron aftinity of Beis
The
(a) Na B
(c)Li (d)He

IX. Nitricacid was also known as

adqua fortis (b) aqua guard
(d) aqua nitrate
(c)aqua hydroxide elements will it show
of the following
atomic number 15. With which
X. An elenmentX has an
similarchemicalproperties?
Va N(7) (b)Ne (10)
(c) O () (d) Be(4)

xi. Nitric acid turns orange coloured methyl orange.

(a) Red (b) Orange
(d)Blue
(Fink
xi. Heating sodiun1 acetate_with soda lime produces :
(a) Ethane byMethane
(c) Ethene (d) Ethync
after the addition of a smallamount of sodium hydroxide
xiii. The colour of the precipitate formed is
ferric chloride
solution to an aqueous solution of
blue
(a) gelatinous white (b) pale
oreddish brown (d) dirty green
by the Haber sproOcess using iron catalyst. Which of the following
xiv. Ammonia is manufacturcd
statementsis incorrect?
a. Nirogen is reduced by hydrogen
yield of ammonia
l00%
b It isnot possible to obtain a
incrcase the spccd of the reaction.
Theiron catalyst isused to
temperature will incrcase the yield of ammonia
, A higher
number 19 will most likely combine chemically with the element
XV. Anclement with the atomic
whose atomic number is :
(a) 18 (b) 11
17 (d) 20
 QUESTION 2.

e gram shoOws an expcrinental set up for the laboratory preparalion o apungs

gas. The gas is alkaline in nature.

Name the gas collected in the jar.

preparation. NHyll t
b. Write the balanced equation for the above
C. How is the gas being collected ? cis plaut
Name the drying agent used.
gas ?
How will youfind that the jar is full of

Column-lI:
ii. Match the following Column-I with

Column-I Column-II

(i) Sulphur dioxide (a) Sulphuric acid

(ii) Oilof vitriol (b) Burning sulphur smell V

(iii) Olcum (c) Rottcn cgg smnell
(iv) Sulphur trioxide (d) Pyrosulphuric
acid
sulphuric acid.
(v) Hydrogen sulphide (e) Anhydride of
correct answers from the bracket: |5
iii. Complete the following by choosing the remains same).
potential_. (incrcases, decreases,
a. Across a period, the ionisation reaction is .(ferric chloride, ferrous chloride.
b. A salt prepared by displacement
silver chloride)
Aluminium powder, a constituent of paints, prevents (heat radiation/ formation of
C.
rust/conduction ofelectric current).
solution when adding sulphuric acid to
d. The black colour disappcars learning a
copper oxide.
concentrated sulphuric acid below 200°C, one of
e. When sodium chloride is heated with
the products formed is (sodium hydrogen sulphate/sodium sulphatc/chlorinc)

d. The bhch co lour of X cuo disappear

wher cohcentated hydrochjoríc acid iso ad
to Solution (copper chlade lead Oxidey e k
 ldenity he following acccpts an clcCtro)
relcascd whcnan ato in the gascous slalc
Theaount of cnergy
lo fomn an aniO1. e lech on ofinty
NSo nm
mtal in the third period. e l:1 t I
The alkaii first period. h L
The clemespresent inthe clectro-negativity. -
d. An clement hav ing highest clecttons. Wo
C. Thenoble gas with duplet arrangcment of

(a) Drav the struetural formula lor each ofthe follop

1. 2.2 dimethyl pentane
C-C-c-C-c
2. methanol
3. Isoprepane Butdne
b. Write the IUPAC name for the following compounds :
1. acetaldehyde
2. acetylene
SECTION - B
(Attempt any four questions.)
QUESTION 3.

members of homologous series of carbon

i. Write the molecular formulae of the third and fifih [21
compounds represented by the generally formula C, H2n-2.
reactions : [2]
ii. Write abalanced chemical equation for each of the following
Actionof dilute sulphuricacid on sodium hydroxide.
a. Actionof dilute sulphuric acid on zinc sulphide.

3|
the periodic table.
ii. The following table represcnts apart of

Li! Be B CN
Al Si P CI
Nal Mg
Br
K
following:
From these elements, answer the K
biggestatomic size ? (
a. Which is the element having ionisation cnergy?
b. Which element has the highest
alkali metals?
C. Which clements constitute

insoluble lcad (Il)oxide into soluble lead (|)

necessary to convert [3
(a)Outline the steps fe
chloride. will be the products ? 1H:
iron reacts with dilute sulphuricacid, what than 7. Is the solution acidic or alkaline
b. If (|l)chloride has apH
less
C. A solution of iron
 JUESTION 4. 12|
Wh arecryolite and fluorspar added topure alumina ?

combustion of 8.8gol propane

ii. (alculate the volume of oxVgen reuuired lor the coplete (2|
(CiH)
(Atomic mass: H1.( 12,0 l6).
laboratory by using an
ammonia gas in the |3!
(a) Write the balanced chenical cquation to prepare
alkali. amimoniagas.
why concentrated sulphuric acid is not used for dry ing
O State collected over water?
c. Why is ammonia gas not brackcts:
of compounds using the test given within
pairs [3|
iv. DIStnguish between the following sulphate (using ammonium hydroxide)
(II)
a. Iron () sulphate and iron hydroXIde)
(using excess ammoniuim
b. A lcad salt and a zinc salt

QUESTION 5.
[21
following reactions :
i.Write down the equations for hydroxide solution.
am1monium chloride is warmed with sodium
a. When concentrated sulphuric acid.
ammonium chloride is warmed with
b. When Ammonium hydroxide,
following as acids, bases or salts : (21
ii. (a)Classify the solutions
of the sodium hydroxide, H;SO4 and HNO3. the
to distinguish between
chloride,
barium chloride, sodium above enables you
reagent chosen from those
(b)Explain how a
two acids mentioned
therein.
questions. (3]
following
number 16. Answver the
iii. An element X has atomic
towhich X belongs?
a. State the period and group
N
b. Is Xa metal or anon-metal?
C. What is the valency of X?2
place betwcen cthane and chlorine to form
iv. (a) What is the type of reaction taking 13|
of this
only onc product. Name the type
monochloroethane?
etheneand chlorine forms
b. The reaction betwcen
reaction.
formula of ethene.
C. (1) Draw the structural structurewhich allows ethene to
react with chlorine in the
ethene
(2) What is the feature of the
way it does ?

QUESTION 6.
i.State :
a. Gay Lussac's law of gaseousvolumes
b. Avogadro's law.
the salt, that most appropriatcly fits the description
:ii. From the list of the following salts choose [2]
given in the following:
Ca(NO;)2]
[AgC1, MgCh, NallSO1, PbC03, ZnCO;, KNO},
a. A deliquescent salt.
b An insoluble chloride.
 13|
elcctrodcs.
usingcopper follows:
clectolvsed yucstionthat
is the
sulphatesolutiop belowandaINWCr
CoPper diagramiven
Dud thc

Copper()
sulplat
solntio1 and why?
the oxidising elecctrode
known as
lefi or right is
Which electrode to your recaction that occurs.
a. representing the electrolysis reaction.
Write the equation for the above
appropriate observations
b. of
State twO and it has
C.
electrolyte is called [3)
enters into an
plate through which current hasol
iv. (a) The mctal
fron anelectrolyte is called and it
clectrons.
plate through which currcnt leaves electrons.
b. The metal
electrons. clectrode during clectrolysis
discharge on the negative
C. The ions which
seid to be.
Thus the ions are
d
QUESTION 7. (3]
i.Name thefollowing: ethene.
which ethane is obtained from effect.
a.
Process by
contributes towards the green house acetic acid.
which ethanol is treated with
b. A hydrocarbon takes place when
Distinctive reaction that following
C.
table. Answer the
solutions A, B and C are given in the [3)
ii. The pH values of three
questions:
pH value
Solution
12
A

B
7
solution ?
solution willhave n0 effect on litmus carbonate?
Which reacted with sodium
liberate CO; when
b Which solution will litmus solution blue ?
C. Which solution willturn red
 contas nitle oxide. he ntric oxide cnhe rennoted by pasng
luion S.Namc the solhution S. chloride da
Vingn can be oblamedin pure stale by heatiny a mixture of anmonwm
ubstace\ Name the substance X.
b iroyendoNide is called mixed anhvdride. Ixplain.

QUESTION 8.
|2|
:
rite the cquation for cach of the following reactions
Sulphur is heated vwith concentrated sulphuric acid.
hydroxide.
Ammonium chloride is heated with sodium
dissolved in
produce ions when
when taken purebut
that are covalent
(a) Nametwo compounds aqucous solutions.
formed in
Water.
compound, give the formulae of the ions
(b)Ior cach |3|
of chemicals :
between the following pairs
one test each to distinguish
GIve
solution and calcium nitrate solution.
Zinc nitrate solution.
solution and sodium chloride
Sodium nitrate copper chloridc solution.
solution and |3]
Iron (|||) chloride reactions.
for ach of the foilowing and then in excess lo a
observaiion small quantity
Siateone rclevant solution is first added in a
Ammonium hydrOxide
l.
solution of copper sulphate.
is added to sodium hydroxide.
Sodium acetate heated copper oxide.
.
over
Amimonia gas ispassed