Assam Board Class 11 Sample Paper Chemistry

ASSAM BOARD

SAMPLE
PAPER
Practice Papers
Model Question Papers

Assam Board Class 11
Sample Question Paper

CHEMISTRY

(Theory )
Full Marks: 70
Pass Marks : 21

Time: 3 hours

The figures in themargin indicate full marks for the questions

ALLOTMENT Or MARKs

Q. No. 1carries 1 mark each (any eight) 1×8 = 8

Q. No. 2 carries 2 marks each (any ten) 2x10 20

Q. No. 3 carries 3 marks each (any nine) 3x9 = 27

Q. No. 4 carries 5 marks each (any three) 5x3 = 15

Total = 70

/135 [Contd.

(2 )
1×8=8
1. Answer the following questions (any eight) :

of
(a) Determine the number of moles present in l 8 g
water.

(b) Find out the isoelectronic species among the following:

K*, Mg?, Ca2, Ar

(c) Write the IUPAC name of the following compound

(d) Arrarnge the following species in increasing order of
ionic radii :

o, Nat, Mg

(e) Fill in the blank :

The shape of BF molecule is

/135

(3 )
/n Define buffer solution.

(g) What do you mean by critical temperature (T) of a gas?

(h) Identify the state functions among the following :

Work, Volume, Enthalpy, Pressure, Temperature

() Which one of the following is not a greenhouse gas?

Methane, Carbon dioxide, Ozone, Nitrogen

6) Choose the correct option

A suitable method for separation of a mixture of
chloroform and aniline iS
sublimation, distillation, differential extraction

/135 |Contd.

|4 )

following is a peroxide?
(I) Which of the

KO2, NazO2, Lizo

HBO3?
() What is the basicity of
H3BO7 ONO fA?

2. Answer the following questions (any ten) : 2x10=20

(a) Determine the four quantum numbers for the valence
electron of sodium atom.

(b) Calculate the amount of water produced (in gram) on
complete combustion of 16 g of methane.

(c) A radio centre broadcasts its programmes at a
frequency of 100:8 MHz. Calculate the wavelength
(in metre) of electromagnetic radiation emitted by the
transmitter.

/135

(5 )
(d) In general, electron gain enthalpy of elements becomes
less negative down a group. However, electron gain
enthalpy of F is less negative than that of the
succeeding element. Explain why.

(e) Write the chemical reactions involved in the detection
of Cl in an organic compound by Lassaigne's test.

) What are the significances of van der Waals' constants
a and b?

(g) State and explain the first law of thermodynamics.

(h) Determine the pH of 0-05 M ammonia solution.
0-05 Mq' 4SS pH Af I |

() What is disproportionation reaction? Give an exanple.

/135 [Contd.

(6 )

(i) Find out the covalent and metallic hydrides among the
following

LiH, NH3, TiH17, H,0

(k) Alkali metals dissolve in liquid ammonia giving deep
blue solutions. Explain why.

magnesium have similar
(9 Explain why lithium and
properties.

present in silicones?
(m) What is the repeating unit
Mention one use of silicones.

"Classical smog occurs in warm, dry and sunny
(n) statement is true or
climate." Mention whether this
classical smog?
false. What are the components of

/135

(7)

3x9-27
3. Answer the following questions (any nine) :

(a) A compound contains 52-14% C, 13-13% H and
34:73% 0. Its molecular mass is 46-068 g. Determine
the empirical and molecular formula of the compound.
ADi GIS 52-14% C, 13-13% H *34-73% O CE IZU4

(b) In general, ionization energy (lE) of elements increases
from left to right across a period. But the actual order
of ionization energy of the second period elements is
Li<B< Be < C< O<N<F< Ne
Explain why
() Be has higher IE than B;
(ü) O has lower IE than N and F.

Li<B<Be <C< O<N<F< Ne

(i) Be IE B qR*:
(i) 0 IE N F FTA AI

/135 [ Contd.

(8 )

fc) Draw the most stable structure of CIF, molecule
mentioning the hybridization state of the central atom.

(d) 500 L of a gas at 1 bar pressure is compressed to
200 L at 30°C. What is the applied pressure on
the gas?
30 °c tUS 1 bar siS AI 500 fbrA (O gbI 200 fabRIA

(e) The threshold frequency for a metal is 7-0x10!+ Hz. If a
radiation of frequency 1·0x10 Hz strikes the metal
and results emission of an electron, then calculate the
kinetic energy of the emitted electron.

( Define coefficient of viscosity.
Mention the factors
affecting viscosity of a liquid.

/135

(9 )
(a) For the reaction at 298 K

2A+ B’C
AH=400 kJ mol and AS 0.2 kJK mol !
Determine whether the reaction will be spontaneous 0r
not at this temnperature.
2A+ B ’C RtaTCDTY AIGA 298 K twSIS AH 400 kJ mol
FAS =0-2 kJKmol, trgyAfrcG1 :pd '4 a

(h) Deduce the relationship between K, and K for the
reaction aA +bB cC+ dD.

aA +bB cC+ dD ffCDIA AI K, FK,4 ATG4 1

() Determine the oxidation number of Cr in dichromate
ion. In the following reaction, identify the oxidation
and reduction pairs

Cr,0% (aq) + sO (aq)’Crt(aq)+so? (aq)

i) What is syn-gas? Give one method for preparation of
syn-gas.

/135 | Contd.

( 10 )
Arrange the following ions
(k) What is hydration enthalpy?
hydration enthalpy. Give the
in increasing order of
order
reason behind this

Be2*, Mg?*, Ca2*, Sr2*

Define electrophiles and nucleophiles. Find out the
() following :
electrophiles and nucleophiles among the

CN, BF3, ROH, RO, CH3, H, H,0

Applying this rule,
(m) State Hückel's rule of aromaticity. aromatic
determine whether the following species are
or not

the chemical reactions
(n) What is borax bead test? Write
involved.

/135

(11 )
5x3=15
4. Answer the following questions (any three) :

(a) Draw the molecular orbital energy diagram of N2
molecule. Calculate the bond order of N molecule.
4+]=5

(b) Which quantum numbers are associated with shape
and orientation of orbital? Arrange the following
orbitals in increasing order of energy :
3s, 4f, 6d, 5p
What is the number of nodes present in 3s orbital?
2+2+1=5

3s, 4f, 6d, 5p

(c) What is an ideal gas? Can oxygen gas behave as an
ideal gas in certain conditions? Derive the ideal gas
equation. 1+1+3=5

/135 | Contd.

(12 )

() state Markownikoff rule. Using this rule, write the
(d) following reaction :
major product formed in the 1+l=2

CH:-CH=CH, + HCI’?
1×3=3
(i) Complete the following reactions :

Fe/4 ’?
(1) HC=CH
Ha ’?
Lindlar's catalyst
OH

(2) + Zn

Dry ether
(3) CH,CH,CH,Br + Na ’?

(e) State Le Chatelier's principle. Applying Le Chatelier's
principle, explain the effect of temperature and
pressure in the production of ammonia by Haber's
process starting from N, and H, gases. 1+4=5

/135 C23

Sample Papers

CBSE Sample Papers
ICSE / ISC Board Sample Papers
AP Board Sample Papers
Assam Board Sample Papers
Bihar Board Sample Papers
Chhattisgarh Board Sample Papers
Goa Board Sample Papers
Gujarat Board Sample Papers
Haryana Board Sample Papers
HP Board Sample Papers
J&K State Board Sample Papers
Jharkhand Board Sample Papers
Karnataka Board Sample Papers
Kerala Board Sample Papers

Sample Papers

MP Board Sample Papers
Maharashtra Board Sample Papers
Manipur Board Sample Papers
Mizoram Board Sample Papers
Orissa Board Sample Papers
Punjab Board Sample Papers
Rajasthan Board Sample Papers
Tamil Nadu Board Sample Papers
Telangana State Board Sample Papers
Tripura Board Sample Papers
UP Board Sample Papers
Uttarakhand Board Sample Papers
West Bengal Board Sample Papers