Question # 1

The acetylene molecule contain a

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Single bond

Double bond

Triple bond

Co ordinate bond

Elements of group 14

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Exhibit oxidation state of -4

Exhibit oxidation state of +4

From M3+ and M4+ ions

Form M4- and M4+ iona

The pair of molecules or ions having identical geometry is.

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BCl3, PCl3

BF3, NH3

CHCl3, CCl4

SiCl4, CCl4

Argon is used in filling of.

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Discharge tubes

Luminous tube

Fluorescent tubes

None of above

The correct order of increasing polar character is.

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H2O < NHE < H2S < HF

H2S < NH3 < H2O < HF

NHE < H2O < HF < H2O

HF < H2O < NH3 < H2S

In nature nickel is found in the form of.

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Sulphides

Silicates

Arsenides

All

The polarity of bonds can lead to polarity of molecules and affect

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Melting point

Boiling point

Solubility

All of above

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

VBT does not edplain

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Absorption spectra

Color of transition metal ion

Heat of formation

All above

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

Setting of plaster of Paris volves.

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Oxidation with atmospheric oxygen

Combination with atmosphere CO2

Dehydration

Hydration to yield another hydrate

The noble gases are found in the atmosphere to the extent of about some percent by volume.

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0.5%

1.0%

1.5%

2.0%

Which of the following is not an ore of nickel.

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Pentalandite

Siderite

Garnierite

Nicollite

The bond length is measured by

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X-ray diffraction

Neutron diffraction

Microwave spectroscopy

All of above

Which metal can produce dihydrogen gas by reaction with dil H2SO4

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Ag

Fe

Cu

Pt

A red color gas, on condensing ti gives a dark blue liquid.

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NO

N2O

N2O3

N2O4

Which show maximum number of oxidation states in 3d series.

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Mn

Ni

Co

Zn

Which of the following is not an alkali metal

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Rb

Sb

Cs

Fr

The important condition for the formation of chemical bond is that.

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Their electron clouds should not diffuse

Both atoms should have high electron affinites.

Both atoms should have same electronegativities

The process should be accompanied by the lowering in potential energy.

Which of the following compounds combines with hemoglobin.

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CO2

CO

NO

N2

Sodium reacts with excess of oxygen to form

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Na2O

NaO2

Na2O2

NaO

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