Question # 1

Which one is more toxic?

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Fe

C

Hg

Ag

Lithosphere has amount of silicon:

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35.30%

27.72%

40.01%

21.13%

The volume of a gas that is occupied by its one mole at STP is called

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total volume

normal volume

molar volume

atomic volume

Density of a gas is usually expressed in

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Kg m³

Kg dm³

g dm^-3

g cm^-3

Slight oxidation of primary alcohol eives

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Ketone

Aldehyde

-Organic acid

An ester

Beryllium differs from other elements of group Il-A due to

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high charge density

comparatively high nuclear charge

small radius

all above

The attracted forces which are created due to repulsion of electronic cloud of the molecules are:

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ion-dipole forces

dipole-dipole forces

dipoles-induced dipole forces

instantaneous dipole-induced dipole

Coagulation in the purification of water is carried out by

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Alum

NiSO₄

BaSO₄

CuSO₄

CH₃CH₂COOH is also named as:

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Propionic acid

Propanoic acid

Acetic acid

Both (a) & (b)

Which of the elements has seven electrons in d-subshell?

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Zn

Co

Cu

Fe

The gasses in the atmosphere are essential for sustaining life on earth; Thus oxygen is required for breathing, What for is carbon dioxide required?

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to help plant to under go photosynthesis

to destroy nitrogen oxide form the atmosphere

to help to clean to atmosphere

to help in fixing of bacteria

Ethyl alcohol on oxidation with K₂Cr₂O₇gives

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Acetic acid

Acetaldehyde

Formaldehyde

Formic acid

Components of environment are:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Electron affinity depends on

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Atomic size

Nuclear charge

Atomic number

Atomic size and nuclear charge both

An organic acdi having molecular formula C₂H₄O₂is

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Formic acid

Acetic acid

Oxalic acid

Propionic acid

Activity of the enzyme is reduced by

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Temperature

Concentration

pH

Inhibitors

The electronegativity of elements in a period from left to right

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Decreases

Increases

First decreases then increases

First increases then decreases

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

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Hydrolysis

Oxidation

Hydrogenation

Electrolysis

A cell in which spontaneous redox reaction generates an electric current is called

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Electrolytic cell

Electrochemical cell

Voltaic or Galvanic cell

Biological cell

The rate of reaction :

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Increase as the reaction proceeds.

Decreases as the reaction proceeds.

Remains the same as the reaction proceed.

May decrease or increase as the reaction proceeds.

The comparative rates at which the solutes move in paper chromatography, depend on:

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the size of per sued.

R_f values of solutes

temperature of the experiment

size of the chromatography tank used.

The oxides of electronegative elements are

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Basic

neutral

Acidic

Amphoteric

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