Question # 1

Th name of chemist who arranged all the elements in the periodic tale is :

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J.Newlands

Columb

Einstine

None of these

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

The SI unit of pressure is:

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N

N/m²

Pascal

atm

Oxygen is ___________

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Metals

Non-metals

Gas

b & c

The atomic radil of the elements in periodic table:

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increase form left to right in period

increase form top to bottom

do not change form left to right in period

decrease form top to bottom in a group

Density of a gas increases, when its:

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temperature is increased

pressure is increased

volume is kept constant

none of these

A bond formed between two non-metals is expected to be:

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covalent

ionic

coordinate covalent

metallic

____________ of copper is done by electrolysis.

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Production

Refining

Both

Nil

____________ is an irreversible cell.

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Dry cell

Chargeable cell

Zn cell

None of these

One atmospheric pressure is equal to how many pascals?

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101325

10325

106075

10523

Bucky molecules have ________________ c-atoms.

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20-60

20-90

40-60

40-100

Concentration is a separating technique in which mineral is separated from.

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Gangue

Silicates

Aluminates

All

About 99% atmosphere's lies within:

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30 kilometre

35 kilometre

15kilometre

11 kilometre

Blonde hair contains compounds of:

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molybdenum

iron

titanium

copper

The ability of carbon atoms to form chains is called.

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Isomerism

Catenation

Resonance

Condensation

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

The most important oligosaccharide is:

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Sucrose

Glucose

Fractose

Maltose

Who put forward the vital force theory?

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Berzelius

Wohler

Dalton

Lavoisier

Chalco-Pyrite is an ore of:

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Copper

Silver

Iron

Aluminium

Glucose and fructose are.

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Pentose

Triose

Hexoses

None of these

Which protect our muscles from cramping?

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Carbohydrats

Vitamins

Lipids

Proteins

Ionic compounds are soluble in water due to:

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Hydrogen bonding

ion-dipole forces

Dipole-dipole forces

Dipole -induced dipole forces

In order to mention the B.P of water at 110 ^oC the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

When an ionic compound is dissolved in water, it dissociate into positive and negative ions, which are surrounded byH2O molecule, This process is known as.

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Hydrolysis

Hydration

Saturation

solvolysis

the volume occupied by 1.4 of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

Relative lowering of vapour pressure is equl to.

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Mole fraction of solute

Mole fraction of solvent

Molarity

Molality

The nature of bond in diamond is

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Electrovalent

Metallic

Coordinate covalent

Covalent

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

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Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

Some impurities of MgCl2 are present in NaCl which separation technique can be used to separate the impurities.

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Filtration

Crystallization

Common ion effect

Chromatography

Which one of the following has no tendency of form coordinate covalent bond with H+

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NH3

H2O

CH4

CH3OH

NaCI and sand can be separated by one of the following without filtration

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Formation of solution and filtration

Formation of solution and evaporation without filtration

Sublimation

Chromatiograghy

Which one of the following gases cannot be liquefied by Line's method.

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Water vapours

NH3

Nitrogen

H2

In cubic and hexagonal closest packing which layer has different arrangement.

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First

Second

Third

Fourth

Tincal is a mineral of

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Al

C

Si

B

The presence of a double bond in a compound is the sign of

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Saturation

Un-saturation

Substitution

None of these

The word paper is derived from the name of which reed plant.

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Rose

Sun flower

Papyrus

Water Hyacinth

Banana flavour is given by the ester

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Octyl acetate

Amyl butyrate

Amyl acetate

Ethyl butyrate

Which one of the following molecules does not form alcohol when reacts with a Grignard reagent.

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Formaldehyde

Acetaldehyde

Propanone

CO2

Nelson's cell is used to prepare

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NaOH

Na₂CO₃

Na metal

NaCl

Boric acid can not be used.

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As antiseptic in medicine

For washing eyes

In soda bottle

For enamels and glazes

Which one is not a meta directing group

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-COOH

-CHO

-COR

-NH₂

Which one is cyclic amino acid

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Glycine

Alanine

Proline

Aspartic acid

f-block elements are also called

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non typical transition elements

outer transition elements

normal transition elements

inner transition elements

Boric acid is used as eye wash due to its

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Weakly acidic property

Antiseptic nature

Antibiotic nature

Weakly basic properties