Question # 1

The molal elevation constant is the ratio of the elevation in boiling point to

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Mojarity

Molality

Mole fraction of solute

Mole fraction of solvent

According to MO theory, the species O⁺₂

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Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately

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800mL

200mL

10mL

Zero

The ratio of close packed atoms to tetrahedral holes in cubic close packing is

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1 : 1

1 : 2

1 : 3

2 : 1

Which of the following belongs to the halogen family?

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Francium

Polonium

Radium

Astatine

For most of the chemical reactions the rate of reaction

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Increase as the reaction proceeds

Decrease as the reaction proceeds

May increase or decrease during the reaction

Remains constant as the reaction proceeds

Which has largest first ionization energy?

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Li

Na

K

Rb

The rotation of two carbon atoms joined by double bond would happened only if

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P_ibond is broken

Sigma bond is broken

Both bonds are broken

None of above

In public urinals, we observe some nascent smell. This smell is due to

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Hydrolysis of urea of urine by urease of atmosphere into NH₃and CO₂

Formation of sulphonic acid by urea of urine

Reaction of CO₂of atmosphere with urea mononitrate in urine

Hydregen present in air reacts with nitrogen forming NH₃

How many kinds of space lattices are possible in a crystal?

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23

7

230

14

In which of the following elements +1 oxidation state is more stable than +3

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B

Al

ga

Ti

Fluorine does not show positive oxidation states due to the absence of

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d-orbitals

s-orbitals

p-orbitals

None

Which of the following does not reflect the periodicity of elements?

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Bonding begaviour

Electronegativity

Ionisation potential

Neutron/proton ratio

2 g of oxygen contains number of atoms equal to that in

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0.5 g of hydrogen

4 g of sulphur

7 g of nitrogen

2.3 g of sodium

The pure crystalline substance on being heated gradually first forms turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears. The behaviour is a characteristic of substance forming

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Allotropic crystal

Liquid crystals

Isomeric crystals

Isomorphous crystals

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remain constant

Decreses for low value of Z and increases for higher value of Z.

The percentage of nitrogen in urea is

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46

60

70

80

The isomers due to the unequal distribution of carbon atoms on either side of the functional group belonging to the same homologous series are called

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Functional isomers

Position isomers

Chain isomers

Metamers

The essential component of organic compound is

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O

C

P

N

Which of the following substances is used as an antiknock compound?

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Tetraethyl lead

Lead tetrachloride

Lead acetate

Ethyl acetate

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