Question # 1

The lightest alkali metal is.

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Lithium

Sodium

Rubidium

Caesium

Has maximum property of catenation.

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C

Si

Sn

Pb

Which of the following will be most effective int he coagulntion of

Fe (OH)3 sol.

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NaCl

MgSO4

AlCl3

Mg3 (PO4)2

What is the oxidation number of the central meal atom in the coordination compound.[Pt(NH#)#Cl]Cl

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-1

0

+2

+3

Which of the following can be used as drying agent of ammonia.

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CaO

Anhydrous CaCl2

P2O5

Conc. H2SO4

What is the most undesirable of all the elements commonly found in steels.

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Sulphur

Phosphorus

Silocn

Magnesium

Which of the following is not an androgen i.e. male sex hormones.

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Androsterone

Testosterone

Oestrone

All of these are make hormone

The concept is also known as electron pair donor acceptor system.

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Bronsted Lowery

Lewis

Lux -Flood

Usanovich

If steel is heated to a temperature well below red heated and is then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

The blue colour of CuSO4 disappears on adding Zn granules to it . it is because of .

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Oxidation of Cu atom

Oxidation of Zn²⁺

Oxidation Cu²⁺

Oxidation of Zn²⁺

Shows a regular increase on moving down the group form carbon to lead

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Atomic volume

Atomic radius

Density

All above

Which of the following statements is not a part of Bohr's theory of the hydrogen atom.

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An electron in an atom revolves aroung the nucleus only in circular paths.

An electron does not absorb energy in the stationary orbit

An electron does not emit energy in the stationary orbit

Energy is emitted or absorbed in a discrete amount from the stationary orbit

In which of the following characteristics does hydrogen resemble halogens.

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Hydrogen is the lightest gas

H atoms contains one electron each

Hydrogen forms ionic hydrides with alkali metals

Hydrogen has three isotopes.

Which is major component of Bordeaux mixture.

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Copper sulphate

Sodium chloride

Calcium chloride

Magnesium sulphate

Complete hydrolysis of nucleotide result in the formation of.

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Heterocyclic bases

A pentose

A phosphate ion

All of these

Nitrogen (N2)) is relatively unreactive because.

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Its electronegativity is high

Its dissociation energy is large

Its atomic radius is small

It is the first element of group 15

Which ratio decides the efficiency nano substance.

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Weight /volume

Surface area/volume

Volume/weight

Pressure/volume

Copper occurs in nature as.

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Native

Combined

Both native and combined

None of the above

The technique which involves the equivalence relation between the quality of electric current passed and quantity of chemical change taking place in the electrochemical cell is called.

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Voltametry

Coulometry

Polarography

Potentiometry

The pH of the tears is

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7.0

7.4

7.8

8.2

The rate at which a substance reacts depends on its.

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Molecular mass

Active mass

Equivalent mass

Molar mass

Biomass refers to all the organic material derived from

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Photolysis

Photosynthesis

Electrolysis

Oxidation

The reduction in ozone layer would lead to

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Temperature chages

Rainfall failure

Increase uv radiation on earth

All above

Lother Meyer plotted a graph showing variation of.

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Atomic volume with increase in atomic number

Atomic volume with increase in atomic weight

Atomic redii with increase in atomic weight.

Atomic weight which increase in atomic number

What of the following is not a Lewis base.

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CN-

AlCl3

NH3

ROH

The variable valency is generally observed in case of.

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Transition elements

Inert gases

Normal elements

Non- metallic elements

Which of the following techniques involves the distribution of solute between two immiscible liquid phases.

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Chromatography

Electrophoresis

Solvent extractions

Solid phase extraction

Which of the following chemical strong oxidizing agent is used in COD test.

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KMnO4

H2SO4

CH3COOH

K2Cr2O7

The change of chemical potential of any component with temperature an constant P and composition, is euqal to.

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Partial molar enthalpy of that component

Partial molar volume

Partial molar free energy

Negative of the partial molar entropy

Ziegler -Natta catalysta is

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(C2H3)3 Al

TiCl4

(C2H5)3 Al/TiCl4

(C2H3)3 B/TiCl2

The most common oxidation state of alkaline earth metals is.

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+1

+2

-2

-1

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