Question # 1

Image a man is sitting in a room. The room is closed from all sides, no entry no exit of any gas. If the room expands suddenly then:

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he will be frightened

he will feel cool

his blood pressure will decrease

he will feel warmth

Which of the following has positive value of enthalpy

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Neutralisation

Atomization

combustion

All of the above

NaNO₃and CaCO₃crystals are Rhombohedral isomrophism is due to

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both soluble in water

their cations belong to S block element

same shape of NO₃^-1and CO₃^-2ions which is triangular planar

same number of O atoms

The energy produced by a carbohydrate is:

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3 kcal/gm

2kcal/gm

6kcal/gm

4kcal/gm

When HCI gas is passed through saturated solution of rock salt, the solubility of NaCl

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Increases

May increase or decrease

Decreases

None of these

If a salt bridge is removed from two half cells the emf is

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Increased

Decreased

Dropped to zero

Electrodes will be reversed

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

At higher temperature isotherm moves away from y-axis because of increase in

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Pressure

Number of moles

Volume

Mass

Aldehydes are easily oxidized to corresponding carboxylic acids in the presence of:

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Strong oxidizing agents

Highly strong oxidizing agents

Tollen's reagent

Tollen's reagent and Fehling solution

Which pair of gases do not obey Dalton's law of partial pressures?

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H2 and He

NH3and HCl

H2 and O2

N2 and O2

If the temperature is inereased of following reaction, then will go in N2 +3H2 <---------> .2NH3, ∆H= -Ve

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Forward direction

Reverse direction

Remain constant

Cannot be predicted

Dilatometer method is useful for the reaction that involve :

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Small volume changes in solutions

Change in infractive indices

Where reactants absorb U.V, visible or infrared radiation

The color of ppts formed by Benedirct's test is

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Brick red

Wine red

Yellow

Orange

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

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Two

Three

Four

None

Francium is an element at the bottom of Group I in the Periodic Table. Which one of the following predication is likely to be correct?

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It will react with water to liberate oxygen

Its hydroxide will be a strong alkali in water

Its carbonate will decompose on heating to give carbon dioxide

Its nitrate on heating will give nitrogen dioxide and oxygen

The self linking of carbon atoms is called

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Chelation

Isomerism

Catenation

None of the above

Proteins and amino acid can be separated by:

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Filtration

^Sublimation

Chromatography

Suction

Noble gases have the electronic configuration with their valance shell ns²np⁶except one

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He

Ne

Kr

Xe

Identify the heterocyclic compound

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Toluene

Pyridine

Butanoic acid

Propenol

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

In water the most important oxidizing agent is dissolved molecular oxygen which ranges from

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

The bond angle between hydrogen atoms and carbon in alkane is

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104.5°

107.5°

109.5°

120.5°

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