Previous Year Paper year:2018 : ICSE-X-Chemistry

with Solutions - page 4

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#1-i-iv
Dry hydrogen chloride gas can be collected by ________ displacement of
air. (downward / upward)
Ans : Dry hydrogen chloride gas can be collected by the upward displacement
of air.

#1-i-v
The most common ore of iron is _________. (calamine / haematite)
Ans : The most common ore of iron is haematite .

#2-a-i
What do you understand by a lone pair of electrons?
Ans : A lone pair of electrons: A pair of electrons which is not shared with any
other atom is known as a lone pair of electrons. It is provided to the other
atom for the formation of a coordinate bond.

#2-a-ii
Draw the electron dot diagram of Hydronium ion. (H=1; O=8)
Ans : Electron dot diagram of hydronium ion:
;

#2-b [3]
In Period 3 of the Periodic table, element B is placed to the left of element A.
On the basis of this information, choose the correct word from the brackets
to complete the following statements:

#2-b-i
The element B would have (lower /higher) metallic character than A.
Ans : The clement B would have lower metallic character than A.

#2-b-ii
The element A would probably have (lesser / higher) electron affinity
than B.
Ans : The element A would probably have higher electron affinity than B.

#2-b-iii
The element A would have (greater /smaller) atomic size than B.
Ans : The element A would have smaller atomic size than B.

#2-c [4]

Copy and complete the following table which refers to the conversion of ions to neutral particles.

Conversion	Ionic Equation	Oxidation / Reduction
Chloride ion to chlorine molecule	(i) ……………………	(ii) ……………………
Lead (II) ion to lead	(iii) ……………………	(iv) ……………………

Ans :

Conversion	Ionic Equation	Oxidation/Reduction
(i) Chloride ion to chlorine molecule	(i) $$\ce{Cl- - e- -> Cl }$$ $$\ce{ Cl + Cl -> Cl2 }$$	(i) Oxidation
(ii) Lead (II) ion to lead	(ii) $$\ce{Pb^{2+} + 2e- -> Pb }$$	(ii) Reduction