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12th Chemistry Monthly Test - 1 ( p-Block Elements-I )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 1 ( p-Block Elements-I )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

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

Carbon
silicon
Lead
germanium

AlF₃ is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

K₃[AIF₃H₃]
K₃[AiF₆]
AIH₃
K[AIF₃H]

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

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

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.

Borax is _______

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

Silicones are ______

ortho silicates
water repellent thermal insulators
both (a) and (b)
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
Oxidation state of carbon in its hydrides
+4

-4

+3

+2

Identify the electron - deficient species

(BH₃)₂
(SiH₃)₂
PH₃
(CH₃)₂

Which of these is not a monomer for a high molecular mass silicone polymer?

Me₃SiCl
PhSiCl₃
MeSiCl₃
Me₂SiCl₂

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)

Which one of the following compounds has similar structure to that of graphite?

Boron nitride
Boron Carbide
Aluminium Carbide
Aluminium Oxide

Which of the following oxide is amphoteric?

SiO₂
CO₂
SnO₂
CaO

Thermodynamically the most stable form of carbon is

Diamond
graphite
Fullerene
none of these

The repeating unit in silicone is

SiO₂

Part - B

Generic 2 - Answer All Question

What are the uses of boron trifluoride?

What is water gas equilibrium?

(i) Silicones are used for making waterproof fabrics. Give reason.
(ii) Diamond - bad conductor of electricity.

Name the building block of zeolites. Why zeolites have high porosity?

Name the two important ores of Boron.

What are silicones?

Write a short note on anamolous properties of the first element of p-block

Among group 14 elements, name
(i) the most electro negative element
(ii) the most metallic element

How is boric acid extracted from borax?

What happens to CO₂ when dissolved in water?

What is tetraethoxy silane? How is it obtained?
What is burnt alum?

What is inert pair effect?

What is phosgene? How is it prepared?

Mention the physical properties of boranes.

What are alums?
Give the structure of CO and CO₂.

Part - C

Generic 3 - Answer All Question

Write a note on metallic nature of p-block elements

How is CO₂ manufactured?
Draw the structure of boric acid.

Describe the structure of graphite.
AlCl₃behaves like a lewis acid. Substantiate this statement.

Describe the structure of fullerenes.

What are the uses of boric acid?

Describe the structure of carbon nanotubes.

Find out the oxidation state of carbon in each of the following:
(i) CaC₂
(ii) H₂CO₃
(iii) HCN
(iv) CO

How is aluminium chloride prepared by McAfee process?

Give one example for each of the following
(i) icosogens
(ii) tetragen
(iii) prictogen
(iv) chalcogen

Account for the following:
(i) CO is used in the extraction of metals.
(ii) CO is poisonous
(iii) CO₂ is used in referigeration

Part - D

Generic 5 - Answer All Question

Distinguish between diamond and graphite.

Write a note on zeolites.

A double salt which contains fourth period alkali metal (A) on heating at 500K gives (B). aqueous solution of (B) gives white precipitate with BaCl₂ and gives a red colour compound with alizarin. Identify A and B.

CO is a reducing agent . justify with an example.
How will you identify borate radical?

A hydride of 2^nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). identify A , B and C.

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