Question # 1

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Fatty acids are:

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Aliphatic mono-carboxylic acids

Di-carboxylic acids

Tri-carboxylic acids

Tetra carboxylic acids

Poly carboxylic acids

If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:

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M/V

RT/M

PM/RT

V/M

According to the general gas equation, density of an ideal gas depends upon

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Pressure

Temperature

Molar mass of the gas

All of the above

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

Vegetable oils are:

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Unsaturated fatty acids

Glycerides of unsaturated fatty acids

Essential oils obtained from plants

To distinguish aldehyde from ketone which solution is used

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Alkaline solution

Fehling's solution

A solution containing K2Cr2O7

A solution containing acid only

Spectrometry method is applicable if a reactant or a product absorbs radiation

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Ultraviolet

Visible

Infrared

Any of these

At freezing point of water, the density decreases due to

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change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

Lecithin is an example of:

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A simple lipid

Phospholipids

Waxes

Proteins

Photochemical smog contains----as main reactants

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Nitrous oxide & unburnt hydrocarbons

NO & brunt hydrocarbons

Nitric oxide & unburnt hydrocarbons

N2O & burnt hydrocarbons

Orthophosphoric acid is

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Monobasic

Dibasic

Tribasic

Tetrabasic

A reaction in which an atom or a group of atoms replaces an atom or a group of atoms in the molecule of a substance is known as

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Addition reaction

Condensation reaction

Elimination reaction

Substitution reaction

The most acidic of the following compounds is

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P₂O₃

Sb₂O₃

B₂O₃

As₂O₃

pH of 0.1 molar HCl solution is

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1

zero

13

14

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

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The radiations emitted in emission spectrum are absorbed in absorption spectrum

Atomic emission spectrum is continuous

Atomic absorption spectrum is continuous

Distance between the lines increases

When a compound X is passed through a dilute alkaline solution of KMnO₄the pink colour of solution is discharged. The compound X is possbibly

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Methane

Ethane

Ethene

Benzene

The largest number of molecules are present in

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3.6 g of H₂O

4.8 g of C₂H₅OH

2.8 g of CO

5.4 g of N₂O₅

0.5 mole of CH₄and 0.5 mole of SO₂gases have equal

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Volume

Mass is gram

Total number of atoms

Number of molecules

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Inter molecular forces in solid hydrogen are

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Covalent forces

Van der Waal forces or London dispersion forces

Hydrogen bonds

All of these

A molecular ion is formed by

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Passing a high energy electron beam through gaseous molecule

Dissolving a salt i dilute acid

Passing electric current through molten salt

Passing electricity through aqueous solutions

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