Question # 1

The number of electrons involved in bonding in Lewis structure of oxalate ion is

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20

14

22

18

Which element amongst the following has the highest boiling point.

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Na

Mg

Ca

K

According to the VSEPR theory, the shape of the SO3 molecule is.

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Pyramidal

Tetrahedral

Trigonal planar

Distorted totrahedron

The rusting of iron is catalysed by which of the following.

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Fe

O2

Zn

H+

What typical penetrator is used in Brinell hardness test

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10 mm ball

1.6 mm diameter ball

20^o needle

None of these

The state of hybridization of Xe in Xe F6 are

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sp2

sp3

sp3 d

dsp3

The first ionization energy of Mg is lower than

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Na

Ca

Al

Be

Which of the following statement is true.

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Ferromagnetic separation is used to remove rion impurities from bauxite.

Aluminium is an amphoteric element which means that it can act as an oxidizing agent and as a reducing agent

Aluminium has a strong attinity for oxygen

Aluminothermic reactions are endothermic

The process of passing of a precipitate into colloidal solution, on adding an electrolyte is called.

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Dialysis

Peptization

Electrophoresis

Electromsmosis

The increasing order of energies of various sub shells is

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1s < 2s<3s<2p<3p<4s<3d

1s <2s<2p<3s<3p<4s<3d

1s>2s>2p>3s>3p>4s>3d

1s>2s>2p>3p>3d>4s

In normal mode of operations of liquid liquid partition, a polar stationary phase is used with a non polar mobile phase Which of the following solvent is used as mobile phase.

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Ethanol

Propanol

Butanol

Hexane

If diesel has cetane number of 50 then the diesel index will be.

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36

46

56

66

The percentage of nitrogen in urea is.

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36%

46%

55%

65%

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

The hardness of water i s due to the presence of dissolved soluble salts of.

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Calcium

Megnesium

Iron

All above

Which of the following molecules belongs to C_av point group.

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H2O

H2S

NH3

BF3

When fullerencs were discovered they were thought to be

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First example of spherical aromatic molecule

First example of spherical non aromatic molecule

First example of diamond lime molecule

None of the above

In smelting process the ore is mixed with

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Silica

Coke

Limestone

All

Which of the following compounds does not show dipole moment.

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CH3OH

HBr

CCl4

CHCl3

Long diseases are about four times more in urban areas as compared to rural areas. This is due to the presence of which of the following. in atmosphere.

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CO2

NO2

O2

N2

The alpha iron will become paramagnetic at temperature above

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770 C

550 C

660 C

440 C

What is the effect of manganese in cast iron.

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^{To affect the machinability ductility and shrinkage depending on form}

To reduce hardness by combining with sulfur below 0.5% and increase hardness above 0.55

To dioxide molten cast iron

Have no effect

The bond angle between hybrid orbitals in methane is

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115.5^o

109.5^o

105,7^o

120^o

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

Which type of elements form ionic hydrides.

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Transitionelements

Metalloids

Elements with high electronegativity

Elements with high electropositivity.

________is best in its cleaning action.

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Soap

Detergents

Surfactant

None of these

The noble gas used or treatment of cancer is

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Helium

Argon

Radon

Krypton

Which of the following compounds liberates CO2 on heating.

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Li2CO3

Na2CO3

K2CO3

All liberate CO2 on heating.

Chlorine when attached to benzene has

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+1 and + R effect

-1 and - R effect

-1 and +R effect

None of the above

Which of the following process is used for the removal of particulates.

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Wet removal by precipitation

Sedimentation

Diffusion and impaction

All above

Consider the coordination compound K2[Cu(CN)4] A coordinate covalent bond exists between

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K+ and CN-

Cu2+ and CN-

K_ and [Cu(CN)4]2+

C and N in Cn

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