Question # 1

Which one of the following molecule have angle of 120 ^o

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Be Cl2

BF3

CH4

NH3

Cadmium has isotopes.

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3

4

5

9

To achieve a good separation, the two liquids are gently shaken to increase their area of.

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Miscibility

Separation

contact

Solubility

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

Molecular crystals are generally

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Hard

Relatively soft

Unstable

do not exist

Which technique is used ot determine the absorption of radiations.

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Spectrometry

dilatometer method

Refractometric method

Optical rotation method

Which of the hydrogen halides has the highest percentage of ionic character.

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HF

HBr

HCl

HI

Lyman series lies in spectral region

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Infrared

Ultra violet

Visible

None of these

Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideal behaviour of gases

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At high pressure, the gas molecules move in one direction only

At high pressure, the collisions between the gas molecules are increased

At high pressure, the volume of the gas becomes insignificant

At high pressure, the intermolecular attraction becomes significant

What is oxidation state of chlorine in Ca(ClO3)2

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+1

+3

+5

+7

The quantitative relationship between rate and concentration is given by.

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Law of mass action

Rate law

Both of these

Le Chatelier's principle

Cathode rays cast shadow when an opaque object is placed in their path. This behavior of cathode rays show that.

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They move is straight line

They are negatively charge

They possess momentum

They are energetic

Ascorbic acid is vitamin.

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A

B

C

D

Which element has highest ionization potential

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Li

Na

K

Rb

Feeling uncomfortable breathing in un pressurized cabins is due to

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High pressure of CO2

Fatigue

Low pressure of O2

Low presssure of CO2

Which pair are iso electronic.

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Na+ and Cl-

Na+ and Mg+2

N-3 and P-3

H+ and H-

Exceptionally low acidic strength of HF is due to.

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Strong polar bond between H and F

Smaller size of fluorine

Strong hydrogen bonding

electronegativity of fluorine

The H - H Bond energy in KJ mole -1 is.

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346

436

463

336

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