Question # 1

Molecular ions are produced in mass spectrometer. Which type of molecular ion formed more abundantly.

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Negatively charged

H⁺ ions

Positively charged

equal positive and negative ions

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

Proteins are classifies into ______ classes based on physic-chemical properties

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2

3

5

9

Which is the incorrect value of gas constant R?

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2.987 cal k^-1 mol ^-1

3.313 Nmk^-1 mol^-1

62400dm³ atm k^-1 mol^-1

1.10821atm dm3k^-1 mol^-1

Atoms having same mass number but different atomic numbers are called.

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Isotopes

isobars

Isotones

isomers

Zn has

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Zero unpaired electrons

Three unpaired electrons

Five unpaired electrons

One paired electrons

Ornithine is

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A basic amino acid

An essential amino acid

Present in protein structure

All of these

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will be:

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Remain uncharged

Double

Reduced

Increased four times

The scope of environmental chemistry is to study:

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Source of chemicals

Transportation of chemicals

Transportation of toxic chemical

All of these

Boron, aluminium, gallium, indium and thallium belong to group lll-A of the periodic table show a decrease with increasing relative atomic mass:

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Ionic character of the compounds

The first ionization energy

The basic character of the oxides

The stability of +2 oxidation

Methanol is prepared from CO and H_{2 using catalyst:}

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ZnO

Cr₂O₃

Pt

Ni

The sample being analyzed is called:

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Electrolyte

Residue

Undue

Filtrate

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Cu

H

N

O

Zn does not displace Mg from MgSO₄solution because

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Zn is more electropositive than Mg

Zn is below Mg in electropositive series

Zn is above Mg in electrochemical series

Zn is trivalent Mg is divalent

The general formula of amino acids is

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The unit of rate constant K ismole^-1 dm³for a chemical reaction, the order of reaction is :

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Order of reaction can determined by an experiment

Order of reaction can determined from a balance equation only.

Order of reaction can determined increases by increasing temperate.

Order of reaction must be in whole number and not in fraction.

The human body can synthesize ______ amino acids

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1

10

20

19

Glycine at pH7 has the structure

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H₂N -- CH₂-- COOH

H₃N⁺-- CH₂-- COOH

H₂N -- CH₂COO^-

H₃N⁺-- CH₂-- COO^-

Which of the following element is most reactive

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Li

Na

K

Cs

Ifk_cof a reaction productis verylarge, it indicates that equilibrium occurs :

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With the help of a catalyst.

With no forward reaction.

At a low product concentration.

At a high product concentration.

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

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Cathode rays are material particles

Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place

Cathode rays are absorbed by the nucleus

Cathode rays become heated

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