Question # 1

Give violet colour to flame

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Gallium

indium

Thallium

Aluminium

Acid rain effects

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Human being

Crops

Aquatic life

All above

In vinyl cyanide, the number of a bonds in

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2

3

1

4

Fluorine is.

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Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of above

When 0.01 moles of NaOH are added to a buffer solution, its pH changes from 4.745 to 4.832 WHAT IS ITS.

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0.115

0.900

0.015

0.215

The Ostwald process is the main method for the manufacture of nitric Acid in the fist step in this process is.

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Nitrogen and hydrogen react to form NH3

Ammonia is burned in O2 to generate N2 and H2O

Nitrogen and oxygen react to form NO2

Ammonia is burned with O2 to generate NO and H2O

AlCl3 fumes in air because of.

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Hydrolysis

Dehydration

Hydration

Oxidation

In group theory the triple degenerate set is denoted by

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eg

t2g

e2g

tg

An element with atomic number 20 is placed in which period of the periodic table.

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1

2

3

4

pKa value of hyponitrous acid is.

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-7.0

8.9

4.1

6.6

Which of the following has the highest melting poing.

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NaCl

Li Cl

KCl

Rb Cl

The most stable oxidation state of chromium is.

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+6

+3

+4

+2

A boy accidently splashes a few drops of conc. H2SO4 on his cotton shirt. A few minutes later, the splashed part blacken and holes appear.This is because the sulphuric acid.

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Heats up the cotton so that it burns

Dehydrates the cotton

Causes cotton to react with oxygen of the air

Removes the elements of water from cotton

Which can be purified by sublimation

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F2

Cl2

Be2

I2

How many unpaired electron are there in a strong field iron (II) octahederal compled.

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0

1

2

4

In urea the amount of nitrogen is

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82.0%

46.0%

33.0%

21.0%

AI Cl3 acts as a strong Lewis acid, because it is.

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A covalent compound

Readily hydrolyzed

Electron deficient

An ionic compound

Group VA of the periodic table consist of elements.

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3

4

5

6

The green colour of glass is due to the presence of.

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Chromium (III)

Cobalt (II)

Mn (IV)

Iron(III)

A property which gradually increases on moving down group in the periodic table is

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Ionization enthalpy

Elemtronegativity

Electron affinity

atomic size

The penultimate shell of carbon contains electrons.

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s2

s2p6

s2p6d10

s2p6d8

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