Question # 1

Gases and dust particles are removed from H2SO4 by

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Tydal effect

Drying tower

Absorption tower

Contact converter

All the halogen form oxyacide, except

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Florine

Chlorine

Bromine

Iodine

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

H2SO4 acts as gent

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Reducing

Oxidizing

Both A and B

None of above

XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 ^oC

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1 : 3

5 :1

1 :20

1 :5

Which of the following steps are involved in the extraction of copper.

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Roasting

Smelting

Refining

All

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

Which of the following elements does not impart any characteristic colour to the flame.

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Ca

Mg

Ba

Sr

An equal volume mixture explodes with violence

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H2 & N2O

H2 & NO

H2 & N2O4

H2 & N2O3

Flourine differs from the other members of its own group due to.

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Its small size and low bond energy

Its higher electornegativity

None-availability of d-orbitals in its valence shell

All the above

Which of the following generally increases on going from top to bottom in a group.

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Metallic charcter

Electronegativity

Oxidising behaviour

Raducing behaviour

Which of the following have identical bond order.

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CN- and O2-

CN - and NO+

O2- and CN+

NO+ and CN+

Potassium crystallizes in a body centered lattice. Hence, the coordination number of potassium in potassium metal is.

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4

6

8

12

Dibornae is used

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Fro high energy fuel

For welding torches

as reducing agent

All above

Elements of group 14 have the electronic configuration of their outer shell as

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ns2 np3

ns2 np2

ns2 np6

ns2

Which is not an ore of aluminium.

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Baxuite

Cryolite

Monazite

Corundum

The noble gas which was discovered first in the sun and then on the earth is.

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Helium

Neon

Argon

Xenon

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware, etc. when mixed wiht cold conc. H2SO4

Which one of the following elements shows the most stable oxidation state of +1

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AI

Ga

In

TI

The high oxidizing power of halogens is favored by.

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Low heat od dissociation of X2

A high electron affinity of the atom

A higher hydration energy of the ion

All of above

Finely divided iron combines with CO to give.

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Fe(CO)5

Fe2(CO)9

Fe(CO)12

Fe(CO)6

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