Question # 1

The interactions in HF are.

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dipole dipole interasctions

Hydrogen bonds

dipole -dipole and dispersion forces

Hydrogen bond and diapersin forces

SO2 acts as

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Lewis base

Lewis acid

Botha A and B

None of above

Chromium is found in nature in the the form of.

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Oxides

Silicates

Borates

Sulphides

Group III A of the periodic table consist of elemetns.

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3

4

5

6

Inert pair effect is best shown by

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Si

Z

Sn

Pb

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide cementite

Graphite

Partly as iron carbide and partly as graphite

In German Silver copper is alloyed with which metal.

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Zn

Ni

Ai

Zn and Ni

Select the correct IUPAC name for [FeF4(OH)2]-

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Diaquatrafluoriron (III) ion

Diaquateratrafluoriferrate (III) ion

Diaquatertrafluoroiron (I)

None of these

Which of the following represent the fuming sulphuric acid

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H2S2O4

H2S2O3

H2S2O6

H2S2O7

The size of iso electronic species - F- , Ne, and Na+ is affected by

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Nuclear charge (Z)

Valence principal quantum number (n)

Electron electron interaction in the outer orbital

None of the factors because their size to the same.

The basic strength of hydrides of group 15 elements very in the following order.

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NH3 > PH3 > AsH3 > SbH3 >BiH3

PH3 > NH3 > AsH3> SbH3 > BiH3

BiH3> NH3 >PH3 > AsH3 > SbH3

NH3 > PH3 > SbH3 > AsH3 > BiH3

Which of the following compounds is must acdic.

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H2O

H2S

H2Se

H2Te

The pH of the 1.3 x 10^-4 NH₄Cl is

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1.3

4.0

2.886

3.886

The silicate chains are present in

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Silica

asbestos

Beryl

Clays

Electron gas theory is able to explain

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Metallic lusture and optical properties

Malleability and ductility

High electrical and thermal conductivity

All of the above

The electronegativity of the following elements increases in the order.

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C,N, Si, P

N, Si, C,P

Si, P, C, N

P, Si, N, C

Green houses are responsible for keeping our plant warm and sustaining life on the earth.

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CO2 & water vapours

CO2 & CFC

CO2 & H2O

CO2 & CH4

Metal are generally elements

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Electronegative

Electropositive

Neutral

None of the above

The formula of bleaching powder is.

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Ca OCl2

CaCIO3

Ca(CIO)3)2

CaOCI

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

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NCl3

RbCl

BeCl2

BCl3

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

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