Question # 1

Buffer solution are used to.

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Increase the pH

Resist the pH

Decrease the pH

None of above

The correct order of ionic radii for the following ions is.

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S²- < P^3- < Cl- < K+

Cl- > S2+ > P3- > k+

K+ > Cr > S2+ > P3-

P3+ > S2 > Cl - > K+

The alkali metal that react with nitrogen directly to form nitrides.

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Na

K

Rb

Li

Which element out of the following can ehibit a maximum con valency of seven.

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Chlorine

Sulphur

Fluorine

both Cl and F

The alkali metal with highest melting point is

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K

Na

Li

Ca

When orthoboric acid is heated strongly it gives.

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B2O3

H2B3O7

HBO2

B

The ionization potential of K would be numerically equal to.

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Electron affinity of Ar

Electromagnetically of K

Electron affinity of K+

ionization energy of Ca

How pig iron is usually obtained from

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iron pyrite

Limonite

Hematite

Siderite

Lewis concept explain the formation of

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Ionic bond

Covalent bond

Co-ordinate bond

Chemical bond

Pig iron is also called.

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Cast iron

Steel

Wrought iron

Stainless steel

The purification of Bauxite can be carried out.

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Baeyer's process

Hall's process

Serpek's process

Any of above

Setting of cement is improved by

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Lime stone

Clay

Gypsum

Water

Of the molecules, SF4, XeF4, and CF which has square planar geometry.

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SF4, XeF4 and CF4

Sf4 only

CF4 only

XeF4

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

Neon is used in neon signs for advertising purpose because.

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Neon lights are visible from long distance

Neon light are visible though fog & mist

Both A and B

None of the above

The valence shell electronic configuration of group III A is.

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ns1 p2

ns2 p1

ns3p2

ns2p2

Both the elements shows allotropy

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B & Ai

B & Si

Al & Si

Any of above

Electronegativity of Oygen is.

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2.5

3.5

2.4

2.1

The element Uuu has atomic numebr

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102

111

101

110

The state of hybridization of Xe in Xe F6 are

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sp2

sp3

sp3 d

dsp3

Elements in the same vertical group of the periodical have same

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Number of electron

Atomic number

Number of valence elections

Electronic configuration

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