Question # 1

The most stable oxidation state of chromium is.

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+6

+3

+4

+2

Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called.

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Glass wool

Safety glass

Optical glass

Jena glass

Which one of the following noble gas is obtained by radioactive disintegrastion

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Kr

Br

Rn

Xe

Tetra halides do not undergo hydrolysis

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C

Si

Sn

Pb

Copper occurs in nature as.

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Native

Combined

Both native and combined

None of the above

Consider to violet colored compund.[Cr(OH)2)6 Cl3 and the yellow compound. [Cr(NH3)6]C;2 which of the following statements is false.

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Both chromium metal ions are paramagnetic with 3 unpaired electrons.

[Cr(NH3)6)3+ is calculated directly form the energy of yellow light

For [Cr(OH)2)6]3+ is less than for [Cr(NH3)6]3+

The two complexes absorb their complementary colors.

Which of the following is an allotrops of hydrogen.

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0- H2

P-H2

Both A and B

None of these

Which of the following molecule does not contain the covalent bond between similar atoms.

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N2H4

F2O2

H2F2

H2O2

The bond order for BO molecule is.

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2.5

3.0

2.0

3.5

Un-like s -block elements d-block elements form which compounds as well

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ionic compounds

Co valent compound

Co ordinate compounds

None of above

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

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

Which among the following is a false statement.

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SiO2 has a structure similar to that of CO2

Natural Si exists only in the combined state

Si can be prepared by reducing SiO2 with Mg

Si does not exist in graphite like structure, but exists only ni diamond like structure.

Which of the following bonds will be non polar.

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N - H

O - H

C - H

C l - Cl

Type of hybrid orbitals used by the chlroine atom in CIO2 is.

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sp2

sp3

sp

None of these

The maximum oxidation shown by managanese is.

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+2

+7

+4

+5

Which of the following would decompose at lowest temperature.

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MgCO3

SrCO3

BaCO3

CaCO3

The law of trinds was proposed by

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Dobereiner

Newlands

Lother Mayer

Chancourtois

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

The matrix is usually in the form of.

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Sand

Limestone

Rocks

All

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.

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