Question # 1

Which of the following represents the correct order of ionic radii

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La+ < Na+ < K+ < Rb+

Li+ > Na + > K+ >Rb+

Li = Na + = K+ = Rb+

Rb +> Na+> K+ > Li+

The base which in not present in DNA is

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Adenine

Guanine

Thymine

Cytosine

Ferrochrum contains Cr up to

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60-70%

70-80%

80-90%

40-50%

Which is the second most abundant element occurring the earth crust.

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Iron

Cu

Cr

Ni

The name hydrogen was proposed by.

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Lavoisier

Rutherford

Henry Cavandish

Scheele

A silver iodide and was prepared by mixing KI and AgNO2 solution with the AgNO2 in slight excess. Which of the following descriptions is correct regarding is not particles.

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Negatively charged because of the excess of NO-3 ions

Positively charged because of the excess of Ag+ ions in the AgI lattice

Negatively charged because I ions are adsorbed from the KI solution

Neutral

When a lead a storage battery is discharged .

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SO2 is evolved

PbS is consumed

Pb is formed

H2SO4 is consumed

Which of the following has the maximum ionic character.

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HF

HCl

HI

HBr

Which of the following is a pseudohalide.

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I3-

IF7

CN-

ICI

Which of the following would decompose at lowest temperature.

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MgCO3

SrCO3

BaCO3

CaCO3

Which of the following gas is lightest.

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Dihydrogen

Helium

Dinitrogen

Dioxygen

Which of the following is the third most abundant element in the nature.

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Oxygen

Sulphur

Aluminum

Hydrogen

Which of the following statements is not correct with respect to applications of H- bonding.

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It explains the usual b.p. and m.p of certain class of compound.

It explains the solubility of certain organic compounds in hydroxylic solvents

It explains the lack of ideal behavior in gases and solutions

It has stonrg influence on the configuration of certain molecules.

Stainless steel contains

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Fe+Cr+Ni

Fe+Ni+Cu

Fe + Cr+ Cu

Cu + C + Ni

Which of the following technique is based on the absorption of light radiation.

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Spectrophotomerty

Colorimetry

NMR

All the above technique

The formation of daughter DNA's from parent DNA is called.

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Transalation

Transcription

Reproduction

Replication

Which of the following statements do not represent Lewis idea of acids and base?

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Compounds which have completely filled orbitals

Compounds which have incompletely filled orbitals

Compounds in which the central atom can expand its octel

All simple metal ions like Ag+, Al3+ etc.

Fluorine is.

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Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of 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

Which of the following reactions have small enthalpy change.

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NaOH with HCl

NaOH with CH3 COOH

HCl with NH4 OH

None of these

Hydrolith is the common name of

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NaH

CaH2

NaF

CaF2

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

a -amino acids when heated alone form

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Cyclic lactum

a-b-unsaturated acid

Fatty acids

Diketopiperzines

Which of the following technique has flame as a source of excitation energy.

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UV spectroscopy

I-R spectrocscopy

Flame photometry

Raman spectroscopy

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

The range of sound pressure which is painful is as

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130-140 dB

100 - 120 dB

90 - 80 dB

All above

Which of the following does not represent Lewis acid.

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ZnCl2

FeCl2

BF3

Bul4

In their ionic compounds halogens exhinit the oxidation states of.

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-1

-2

-3

-4

Which treatment is done with pulp before delivering it to paper making machine.

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Pulp is disperse din water to make slurry

Mechanical refining or heating of the fibers

Addition of chemical additives and recycled fibres from the waste paper plant

All above

Which of the following is not a ligand or complexing agent.

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NH3

CH3COOH

EDTA

CN-

The magnetic quantum number (m) specifies the individual orbital in a Sub shell for a given l, m can be.

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l,l- l........-1

l........2, l -3.......-2l

l-l-2,..........-l

l-2,l-4, ............-4l

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