Question # 1

Which of the following statements is not true for both B and Al

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They burn in oxygen to give oxides at high temperature

Their halides are Lewis acids

They combine with nitrogen to form nitrides

They react with HCl to form chlroides.

What types of bonding occurs in d-block elements.

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Ionic

Covalent

Metallic

Both B and C

Which of the following elements has the highest value of IE.

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Na

K

Mg

Ca

DTA is of great importance in which of the following field

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Ceramic

Metallurgy

Mineralogy

All

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

The width of a carbon nano tube is.________ nm

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1

1.3

2.5

10

The gases that are responsible for green house effect are.

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CO2 & CH4

CFC

N2O

All above

If Principal quantum number n = 4 the quantum number l can have calue.

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1,2,3 and 4

0,1,2 and 3

1,2 and 3 only

None of the abvoe

In the Mendeleev's periodic table elements are arranged in the increasing order of their .

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Numbers of neutrone.

Atomic number

Atomic mass

Atomic volume

When FeSO4 is added in the sodium extract the compound formed is.

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Only Na4[Fe (CN)6]

Only Fe (OH)2

Only Na2So4

Mixture of all these

PCl5 is an example of hybridization

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d sp³

d2 sp2

sp2

sp3

Among the elements of second period the element with highest melting point belongs to group.

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1

14

17

18

in monel metal copper is alloyed wiht which metal.

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Fe

Mn

Ni

All

Which of the following in not a characteristics of crystalline solids.

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Sharp melting point

Isotropic

Long range orderly arrangemnt

None of above

Stable metal ions strictures are.

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Noble gas structure

Is electron group structure

Transition metal in structure

All of the above

What is abuckyball

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A carbon molecule

Nickname for Mercedes -Benz's futuristic concept car (CIII)

Plastic explosives nanoparticle (C4)

Concrete nanoparticle with a compressive strength of 20 nanonewtons(C20)

The boiling point of water is unexpectedly high because.

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H2O molecule in linear

Sp3 hydrogen bonding is involved in the formation of water

There is hydrogen bonding and consequent association of H2O molecules.

Oxygen is the first member of the VI group

CFT can very well explain

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Color

Magnetic properties

Spectra of transition metal

All

Most electronegative element is.

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C

Si

Pb

Sn

Which of the following is not a characteristics of terponoids.

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They are pleasant smelling liquids

They are steam volatile

They are nitrogenous bases

They are insoluble in water

Chromium is found in nature in the the form of.

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Oxides

Silicates

Borates

Sulphides

D(+) glyceraldebydes has the absolute configurtion.

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E-

S-

E-

Z-

Concentration polarization arises because of the

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Different concentrations of solutions in the two half cells

Changes in the concentration of electrolyte around the electrode from bulk concentration

Reversible nature of the cell

Variation in temperature during measurements

Glass was first made by about________

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40 BC

400 BC

4000 BC

100 BC

Ionic reactions mainly take place in.

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Aqueous solutions and organic solvents of high polarity

Non aqueous solvents of low polarity

Gaseous state

Solid state

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 one of the following has the highest boiling point.

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H2O

H2S

H2Se

H2Te

A colloidal system in which both the dispersion phase and dispersed phase are liquid is.

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Smoke

Emulsion

Whipped cream

Mist

1 nanometre =___________ cm

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10^-9

10^-8

10^-7

10^-6

Which of the following statements is not true with respect to atomic spectroscopy.

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Atoms are simplest form of matter

Atoms cannot rotate or vibrate as molecules do

Only electronic transitions within atoms take place

Band spectra are observed

Which of the following is the most abundant alkaline earth metal.

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Be

Mg

Ca

Sr

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