Question # 1

Along period of periodic table shielding effects.

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Increases

Decreases

Remain constant

First increases than decreases

If the energy of the activated complex lies close to energy of reactants, it means that reaction is

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Slow

Fast

Exothermic

Endothermic

In chromatographic technique. Rf has unit.

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Mol dm-3

Cm

m3

No units

Solvent extraction method is particularly useful technique for separation when the product to be speared is.

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

In mass spectrometry, ions are produced by

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Heat at high temperature

Passing gas through high voltage plates

Throwing fast moving electrons on gas molecules

All of them

Which one of the following statements is incorrect.

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Enzymes are protein in nature

Enzymes are catalyst

Enzymes can catalyze any reaction

Urease is an enzyme

A molecule has two ions pairs and two bond pairs around the central atom. The shape of molecule is.

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Linear

Pyramidal

Angular

Tetrahedral

According to MOT, which molecular orbital has highest energy.

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sigma 1s

pi+ 2S

pi 2py

Pi+ 2px

How many allotropic forms are present in carbon

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Two

Three

Four

Five

Catalyst used in preparation of NH3 from N2 and H2 is.

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Ni

Fe

Pt

V2O5

_________ was derived by C.M Guldberg and P Waage in 1864

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Law of conservation of Mass

Law of mass action

Law of conservation of energy

Distribution law

Fluorine molecule (F₂) is formed by the overlap of

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s - s orbital

s - p orbital

p - p head on overlapping of orbitals

p - p parallel overlapping of orbitals

If we want to change O₂to O₂^-1The electron is to be placed in

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Polymorphic substances have

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Same physical and chemical properties

Different physical and chemical properties.

Same physical but different chemical properties

Different physical and same chemical properties.

Melting of ice can be forwarded by the use of.

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LiCl

BeCl2

NaCl

Ag Cl

Unit of rate constant is the same as that of the rate of reaction in

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Zero order reaction

1st order reaction

2nd order reaction

3rd order reaction

The shape of H₃O is

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Tetrahedral

Angular

Trigonal planer

Pyramidaj

Which acid has less value of pKa.

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CH3COOH

H2S

H2CO3

HCl

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