Question # 1

Which of the following solutions has the highest boiling point ?

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5.85% solution of sodium chloride.

18.0% solution of glucose.

6.0% solution of urea.

All have same boiling points.

Alkyne is :

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CH_3-CH₃

CH₄

CH₂₌CH₂

C₂H₂

The number of atoms or molecules whose concentrations determine the rate of the reaction is called

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Molecularity

Order

Rate of reaction

Rate constant

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There is no change in temperature

No change in volume

Heat is absorbed

Heat is released

The electron releasing effect of methyl group is significant and it makes ring a good

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Electrophilic

Nucleophilic

Nucleophobic

Hydrophobic

Molecular orbitals are filled with the available:

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Hund's of rule.

Pauli's exclusion principle.

Aufbau principle.

All of above.

In Tolten's best, the end product is ______ formed

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White ppts

Red ppts

Yellow ppts

Silver mirror

The process in which water molecules surround solute particles is called

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Hydration

Salvation

Hydrolysis

Dehydration

Which of the following compounds on oxidation gives benzoic acid?

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Chlorophenol

Chlorotoluene

Chlorobenzene

Benzyl chloride

Mixture of alcohol and water can be separated by

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Solvent extraction techniques

Crystallization

Precipitation and filtration

Fractional distillation

Which one of the following properties is not correct for ozone?

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It oxidizes lead sulphides

It oxidizes potassium iodide

It oxidizes mercury

It cannot act as a bleaching agent

The value of R (Rydberg's constant) is _______ m-1

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1.0974 x 107

1.0842 x 107

1.082 x 10-7

Both a and b

Reaction of Grignard's reagent with formaldehyde gives:

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pri-alcohol

sec-alcohol

ter-alcohol

carboxylic

1-Chlorobutane on reaction with alcoholic potash gives

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But 1-ene

Butan-1-ol

But-2-ene

Butan-2-ol

In a period, melting points of elements

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Increases

Decreases

Remain constant

First increases then decreases

type of hybridization in CH≡CH is:

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sp

sp²

sp³

dsp²

Williamson's synthesis is used to prepare

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Diethylether

Phenolphthalein

Hydrogenation

Bakelite

Coupling of Pb with its Pb⁺⁺/Pb = -0.13 V and Ag with Ag⁺/ Ag = +0.80 V, the cell reaction

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Quality of fuel is judged from its octane number. The best fuels are

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Straight chain hydrocarbons

Branched chain hydrocarbons

Cyclic compounds

Compounds containing benzene ring

A gas bulb is filled with NO₂gas and immersed in an ice bath at 0°C which becomes colourless after sometimes. This colourless gas will be

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NO₂

N₂O

N₂O₄

N₂O₅

Saturated solution of a solid is prepared at a constant temperature. 100 cm³of this saturated solution is evaporated in a china dish. The mass of the residue is called

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Azetropic mixture

Solubility

Solubility product

Equilibrium constant

How many molecules of chlorine adds in benzene in the presence of sunlight

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One

Two

Three

Four

One mole of SO₂contains

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6.02 x 10²³atoms of oxygen

18.1 x 10²³, molecules of SO₂

6.02 x 10²³atoms of sulphur

4 gram atoms of SO₂

The percentage of H is the highest in

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CH₄

NH₃

H₂SO₄

C₆H₁₂O₆

d-block elements closely resemble in their physical and chemical properties. Which statement is incorrect

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They show variable valency

Their ions and compounds are coloured

They are good conductors of heat and electricity

Their compounds are diamagnetic

Which one of the following is an ideal solution that obeys Rault's law

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Ethanol + water

Benzene + toluene

HCI + water

Acetone + chloroform

In CCL4 solvent I3 shows:

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Blue Color

Brown Color

Purple Color

Pink Color

Which is the derived lipid?

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Common fats

Vitamin-D

Common oils

Spinolipids

The structure of benzene is

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Hexagonal

Pyramidal

Square planer

Tetrahedral

2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is

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2-Ethoxypentane

Pent-1-ene

cis-Pent-2-ene

trans-Pent-2-ene

Domestic waste mostly constitutes

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Non-biodegradable pollution

Biodegradable pollution

Effluents

Air pollution

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