Chemistry Group III-A and Group IV-A elements MCQs of FSC second year
FSC Part 2:Chemistry Chapter 3 Group III-A and Group IV-A elements Notes and MCQs for practice and board exams are collected.These are quite important for 2nd year students.
1.
Crystalline form in which, litharge usually
exist are:
a.
Monoclinic and Tetragonal b. Cubic and hexagonal
c.
Rhombic and Tetragonal d.
Triclinic and Orthorhombic
2.
Sodium silicate is a salt of
a.
H2SiO3 b. HSiO3 c.
SiO2 d.
H2Mg3(SiO3)4
3.
When a hot concentrated solution of borax is
treated with conc. H2SO4, crystals of acid are produced.
a.
HBO2
b. H3BO3 c.
H2B4O7
d.
H6B4O9
4.
Feldspar, potash mica and zircon are the famous
minerals of
a.
C b.
Si c. Al
d.
Fe
5.
Which metal is used in the thermite process
because of its activity?
a.
Iron b. Copper c. Aluminium
d.
Zinc
6.
Chemical composition of colemanite is
a.
Ca2B6O11. 5H2
O b.
CaB4O7 . 4H2
O
c.
NaB4O7 . 4H2
O d.
CaB5O9 . 8H2
O
7.
Which element forms an ion with charge +3.
a.
Be b.
Al c. C d.
Si
8.
Tincal is a mineral of
a.
Al b.
B c.
Si d.
C
9.
Substance
which is found in dried up lakes of Tibet and California is
_____________
a.
Tincal b. Boric
acid c.
Calcium carbonate d. All
10.
Which electronic configuration corresponds to an
element of group IIIA?
a.
1S2 , 2S2 , 2P3 b.
1S2 , 2S2 ,
2P6 , 3S2 , 3P1
c.
1S2 , 2S2 , 2P4 d.
1S2 , 2S2 , 2P6 , 3S2 , 3P3
11.
In network of silica (SiO2) , one
silicon atom is surrounded by______________ atoms of oxygen.
a.
4 b.
2 c.
1 d.
6
12.
Orthoboric acid is 2.6% soluble in water at 40oC
and ______________ at 1070C
a.
26% b.
27% c. 37%
d.
< 2.6%
13.
The methyl silicone of high molecular mass is
like
a.
Plaster b. Lubricant
c. Glass d. Rubber
14.
H3BO3 is
a.
Metaboric acid b. Pyroboric acid c. Orthoboric acid d. Tetraboric acid
15.
Gibbsite contain water molecules
a.
6 b.
2 c.
5 d.
3
16.
The observed C – O bond distance in CO2 is
a.
120pm b. 115pm c.
110pm d.
105pm
17.
Boric acid is used as eye wash due to its
a.
Weakly acidic property b. Antiseptic
nature
c.
Antibiotic nature d.
Weakly basic properties
18.
In SiO2 , the central atom silicon is
hybridized
a.
Sp3 b.
Sp2 c. Sp
d.
dsp3
19.
Which one of the following is not a
characteristic property of carbon?
a.
Catenation b.
Multiple bond formation
c.
Activity of d – orbital for
bonding d. Hardest allotrope
20.
Corundum is
a.
Al2O3 b. Na3AlF6 c. quartz d.
Calcium
21.
In transistors, silicon is used as
a.
Super conductor b. Semi - conductor c. Bad conductor d. Insulator
22.
The total number of electrons in one molecule of
CO2 is
a.
22 b.
44 c. 66
d.
88
23.
Which substance is not formed by heating plumbus
oxalate?
a.
Pb2O
b. CO2 c.
CO d. Pb3O4
24.
In which substance silicon is not present
a.
Talc b.
Asbestos c. Dolomite
d. Zircon
25.
Metallic character _____________ from left to
right is periodic table
a.
Increases b.
Decreases c. Remains constant
d. None of them
26.
Pentahydrate borax separates out when heated at
a.
Above 62oC b. Below 62oC
c.
Below52oC d. None of them
27.
Boric acid can be titrated is the presence of
glycerine against standard alkali using
a.
Methyl orange b.
Phenolphthalein c. Borax d. None of them
28.
Which metal is used to remove air bubbles from
molten metal
a.
B b.
Al c. Ga
d.
In
29.
Cooled liquid silica is called
a.
Vitreous silica b.
Amethyst quartz c. Fused
quartz d. None of them
30.
The stable yellow modification of lead chromate
is
a.
Monoclinic b.
Triclinic c. Cubic d. Trigonal
31.
Boron is non – metal whereas Al is metal, it is
due to
a.
Small size b.
High nuclear charge c. Both a & b d. No authorized justification yet
32.
Boron in soil has been considered essential
specially for
a.
Soil porocity b. Proper growth of plants c.
Alkalinity of soil d. All
33.
One of the outstanding feature of boron is its
ability to form _______________
a.
Molecular addition compounds b. Molecular
crystals
c.
Semi conductors d.
All
34.
Which of the following is not a use of silicon?
a.
Lubricants b.
Hydranlic brakes c. Antifreeze
d. Water
repellent
35.
Litharge is chemically
a.
PbO b.
PbO2 c. Pb3O4 d.
Pb (CH3COO)2
36.
Which are correct oxidation states for lead?
a.
+1, +2 b. +3,
+5 c.
+2, +4 d.
+4 only
37.
Which one of the following is ore of boron
a.
Galena b. Cinnabar
c. Emerald d.
Colemanite
38.
Which one of the following reactions of Al with
different substances is used in photo flash?
a.
2Al + 3H2
2AlH3 b. 4Al + 3O2 2Al2O3
c.
2Al + N2 2AlN d. 2Al + Cl2 2AlCl3
39.
A solution of borax in water is
a.
Acidic b. Alkaline
c.
Neutral d. Non of
these
40.
Orthoboric acid on strong heating to red heat
gives
a.
Borax b. Boron
oxide c. Metaboric acid d. Tetraboric
acid
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