Previous Year Paper year:2016 : ICSE-X-Chemistry

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ICSE-X-Chemistry

Previous Year Paper year:2016

with Solutions - page 3

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#1-e-iii
The catalyst used in the conversion of ethyne to ethane.
Ans : The catalyst used in the conversion of ethyne to ethane: Lindlar
catalyst

#1-e-iv
The type of reactions alkenes undergo.
Ans : The type of reactions alkenes undergo: Addition reaction

#1-e-v
The electrons present in the outermost shell of an atom.
Ans : The electrons present in the outermost shell of an atom: Valence
electrons

#1-f

#1-f-i
A gas of mass 32 gms has a volume of 20 litres at S.T.P. Calculate the
gram molecular weight of the gas
Ans : Given:
Mass of gas = 32 g
Volume occupied by 32 gms of gas =20 litres
Number of moles of gas = ``{\text{volume of gas} \over \text{molar gas volume}}``
`` = \frac{20}{22.4} = 0.89 \approx 0.9 ``
Number of moles of gas = ``{\text{Mass of Gas} \over \text{Gram Molecular weight of Gas}}``
hence
Gram molecular weight of gas = ``\text{Mass of gas} \over \text{Number of moles of gas} = \frac{32}{0.9}= 35.55 g``

#1-f-ii [5]
How much Calcium oxide is formed when 82g of calcium nitrate is heated?
Also find the volume of nitrogen dioxide evolved :
$$\ce{2Ca(NO3)2 -> 2CaO + 4NO2 + O2}$$
Ca=40,N=14,O=16
Ans : $$\ce{2Ca(NO3)2 -> 2CaO + 4NO2 (^) + O2 }$$
At STP , 1 mole of any gas contains 22.4L
Since, 4 moles of ``\ce{NO2}`` are produced,
volume of nitrogen dioxide obtained = ``4 \cdot 22.4 = 89.6 L``
2 moles of ``\ce{Ca(NO3)2}`` produces 2 moles of CaO
∵328 g ``\ce{Ca(NO3)2}`` produces 112 g CaO
∴1 g ``\ce{Ca(NO3)2}`` produces ``\frac{112}{328}`` of CaO
∴ Hence, 82 g of Ca(NO ) will produce
``\require{cancel} \frac{112 \cdot \cancel{82} }{\cancelto{4}{328}} = \frac{112}{4} = 28 g ``

#1-g [5]

Match the salts given in Column I with their method of preparation given in
Column II :

Column I	Column II
(i) ``\ce{Pb(NO3)2 from PbO }``	A) Simple displacement
(ii) ``\ce{MgCl2 from Mg }``	B) Titration
(iii) ``\ce{FeCl3 from Fe }``	C) Neutralization
(iv) ``\ce{NaNO3 from NaOH }``	D) Precipitation
(v) ``\ce{ZnCO3 from ZnSO4 }``	E) Combination

Ans :

Column-I	Column-II
``\ce{Pb(NO3)2}`` from PbO	Precipitation
``\ce{MgCl2}`` from Mg	Simple displacement
``\ce{FeCl3}`` from Fe	Combination
``\ce{NaNO3}`` from NaOH	Neutralisation
``\ce{ZnCO3}`` from ``\ce{ZnSO4}``	Titration

(h)

#1-h

#1-i [5]
Write the IUPAC names of each of the following :

Ans : -1. 1-Propene
-2. 2-Butyne
-3. Ethanal

#1-ii
Rewrite the following sentences by using the correct symbol > (greater
than) or < (less than) in the blanks given :
1. The ionization potential of potassium is _________________ that of
sodium.
2. The electronegativity of lodine is ___________ that of Chlorine.
Ans : -1. less than
-2. less than

# [40]
Section : II
Attempt any four questions from this Section

#2
Ans : 2.

#2-a [4]
Use the letters only written in the Periodic Table given below to answer the
questions that follow :

#2-a-i
State the number of valence electrons in atom J.
Ans : 5
Atom J is a Group 5 element and a group is determined by the number of
electrons present in the outermost shell.

#2-a-ii
Which element shown forms ions with a single negative charge?
Ans : Element M from Group 7 accepts one electron to form an ion with a single
negative charge.