Question # 1

Which of the following mixture is used as most popular flame in AAS.

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Acetylene air

Acetylene O2

Hydrogen air

Hydrogen O2

The three isotopes of hydrogen differ from one another in

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Atomic number

Number of protons

Nuclear charge

Nuclear mass

The constant temperature and pressure,the rates of effusion of various gases vary inversely as square root of their denature. This is a statement of.

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Boyle's law

Charles's law

Graham's law

Daltons's law

In reverse phase chromatography which of the analyte will be retained more on the stationary phase.

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Semi polar

Non polar

Polar

None of the above

Molecule of oxygen is

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Diamagnetic

Paramagnetic

Both A and B

None of above

A general trend in the properties of elements of carbon family shows that with increase in atomic number.

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The tendency towards concatenation increases

The tendency to show +2 oxidation state increase

Metallic character decreases

The tendency to form complexes with convalency higher than four decreases.

Which of the following is not an organic precipitating agent.

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Diemethglyoxime

Cuperon

Oxime

Acetate

The suffix "ate" at the end of the name of the compiled signifies that it is.

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Cation

Anion

Neutral

None of above

The compound (CH3)3COH according to IUPAC is known as.

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Tert Butanol

2,2 -Dumethyl -Propanol

2- Methyl -2-propanol

Tert Alcohol

Which one has a co ordinate bond.

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Al2Cl6

BF3

NaCl

O2

In which of the following techniques the solvated molecules are separated according to their size by their ability to penetrate a sieve like structure.

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Adsorption chromatography

Partition chromatography

Ion exchange chromatography

Gel permeation chromatography

Nitric acid is used in the manufacturing of.

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Dyes

Drugs

Artificial silk

All above

The dimensions for first order rate constant are.

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s-1

s mol-1

mol-1 s-1

s

For covalent bond to form between two atoms A and B

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Transference of electrons must take place from A to B

A pair of electrons of A is shared by both A and B

A and B contribute equal no. of electrons for mutual sharing by A and B

One of the atom A or B must already have octet of electrons.

Point out the incorrect statement.

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Rate law is an experimental fact whereas law of mass action is a theoretical in nature.

Rate law is always different from the expression of law of mass action

Rate law is more informativeness than law of mass action

Order of the reaction is equal to the sum of the exponents of concentration terms in the case law.

Which of the following elements would have the lowest first ionization energy

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Mg

Rb

Li

Ca

Allotropic form of tin

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White tin

Grey tin

Rhomic tin

All above

Duralumin is an alloy of.

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Mg + AI

Ai+ Mg+Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

Which of the following factors does not effect the rate of the reaction.

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Pressure

Temperature

Concentration

Catalyst

All of the above

Which type of organic compounds does fat belong to.

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Alkene

Ester

Alkanol

Alkanoic acid

Which of the following is capable of forming zwitter ion.

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Amino acids

Halo acids

Hydroxy acids

All of these

The wire of flash bulb is made up of.

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Cu

Ag

Mg

Ba

Which of the following compounds is electrovalent in nature.

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SO2

ICI

KBr

CHI3

Which of the following level is an indicator of hearing loss.

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> 25 dB

< 25 dB

<20 dB

None of these

The law of trinds was proposed by

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Dobereiner

Newlands

Lother Mayer

Chancourtois

Which of the following substance acts as gaseous pollutant.

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NO

NO2

CO

SO2

All above

Which of the following equations represent linear free energy relationship.

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Hammett equation

Taft equation

Helmholtz equation

Differential equation

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

Which of the following technique is the application of voltammetry at a fixed potential to detect changes int he currents as a function of the concentrating of the analyte

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Amperometry

Coulometry

Polarography

Potentiomertry

If diesel has cetane number of 50 then the diesel index will be.

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36

46

56

66

Pick out the incorrect statement for XeF4

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XeF4 disproportionate violently with water

It is used as fluorinating agent

It has octahedral structure for geometry

It oxidizes I to I₂

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