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12th Chemistry weekly Test - 4 ( p-Block Elements-I )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test - 4 ( p-Block Elements-I )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

Column-I Column-II

A Borazole 1 B(OH)₃

B Boric acid 2 B₃N₃H₆

C Quartz 3 Na₂[B₄O₅(OH)₄]8H₂O

D Borax 4 SiO₂

A B C D

2 1 4 3
A B C D

1 2 4 3
A B C D

1 2 4 3
None of these

The element that does not show catenation among the following p-block elements is

Carbon
silicon
Lead
germanium

On moving down the group 13, density ______

decreases
increases
First decreases then increases
remains same

Which one is correct statement for zeolite?

Zeolites are aluminosilicates having three dimensional framework
Hydrate zeolites are used as ion exchangers in hardening of soft water
Zeolites are alumino silicates
all the above

The repeating unit in silicone is

SiO₂

Which of the following metals has the largest abundance in the earth’s crust?

Aluminium
calcium
Magnesium
sodium

Select the incorrect statement regarding B₂H₆.

It contains B-B ionic bond
Each boron is Sp³ hybridised
It has two types of hydrogen bonds
it is used as a reducing agent

Elements of group 13 mainly form covalent compounds because ______

small size
electro negativity values are high
ionization energy is very high
both (a) and (c)

Allotropy is due to ______

difference in chemical properties
difference in the number of atoms in the molecules
difference in the arrangement of atoms in the molecules in the crystal
None of these

Which of the following statements about H₃BO₃ is not correct?

It has a layer structure in which planar BO₃ units are joined by H-bonds
It is a strong tribasic acid
It is prepared by acidifying an aqueous solution of borax
It does not act as proton donor but acts as lewis acid by accepting hydroxyl ion

Aluminium is used for making alloys because of its _____

resistance to corrosion
poor conductivity
heaviness
all of these

The silicates which contain discrete tetrahedral units are _______

ortho silicates
sheet silicates
pyrosilicates
three dimensional silicates

Chemical formula of phosgene is

COCl₂
CaOCl₂
CaCO₃
COCI

The stability of +1 oxidation state increases in the sequence

Al < Ga < In < Tl
Tl < In < Ga < Al
In < Tl < Ga < Al
Ga< In < Al < Tl

Oxidation state of carbon in its hydrides

+4
-4
+3
+2

Identify the electron - deficient species

(BH₃)₂
(SiH₃)₂
PH₃
(CH₃)₂

Which among the following is not a borane?

B₂H₆
B₃H₆
B₄H₁₀
none of these

The compound that is used in nuclear reactors as protective shields and control rods is

Metal borides
metal oxides
Metal carbonates d) metal carbide
none of these

The stability of +1 oxidation state among Al, Ga, In and Tl increases in sequence

TI < In < Ga < Al
In < TI < Ga < Al
Ga < In < Al < TI
Al < Ga < In < TI

Lewis acid character of boron trihalides is as a follows:

BF₃ > BCl₃ > BBr₃ > BI₃
BCI₃> BF₃ > BBr₃ > BI₃
BI₃ > BBr₃ > BCl₃ > BF₃
BI₃ > BF₃ > BCl₃ > BBr₃

In diborane, the number of electrons that accounts for banana bonds is

six
two
four
three

Graphite has

2-d sheet structure
Vander waals force between successive layers of carbon sheets
Sp² hybridised carbon linked with other three carbon atoms in hexagonal planar structure
all the above

Which of the following is not sp2 hybridised?

Graphite
graphene
Fullerene
dry ice

SiO₄^4- ion has ____ geometry.

Triangular
Tetrahedral
Linear
Pentagonal bipyramidal

Duralumin is an alloy of

Cu,Mn
Cu,Al,Mg
Al,Mn
Al,Cu,Mn,Mg

Group 14 elements have general electronic configuration _______

ns²
ns²np⁴
ns²np⁶
ns²np²

An aqueous solution of borax is

neutral
acidic
basic
amphoteric

Thermodynamically the most stable form of carbon is

Diamond
graphite
Fullerene
none of these

Borax is _______

Na₂[B₄O₅(OH)₄).8H₂O
Na₂[B₄O₅(OH)₆).7H₂O
Na₂[B₄O₃(OH)₈].6H₂O
Na₂[B₄O₂(OH)₁₀).5H₂O

Boric acid is an acid because its molecule (NEET)

contains replaceable H+ ion
gives up a proton
combines with proton to form water molecule
accepts OH- from water ,releasing proton.

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