Question # 1

Which one of the following has highest pH

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Distilled water

1 M NH4OH

1 M NaOH

Water saturated with chlorine gas

Almost forward reaction is complete when value of Kc is

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very high

Very small

Neither large nor very small

No correlation

Splitting of spectral lines when atoms are subjected to magnetic field is called.

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Stark effect

Zeeman effect

Photoelectric effect

Compton effect

The concept of distribution of velocities among the gas molecules was given by.

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Clausius

Mexwell

Boltzmann

Vander waal

Gases exert pressure on the walls of the container becasue the gas molecules.

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Collide with each other

Collide with walls of container

Have definite volume

Obey the gas laws

Which of the following has bond angle of 120 ^o

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BeCl2

BF3

CH4

NH3

The long chains of amino acids are coiled about one another onto a spiral by

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Ionic bond

Van der walls forces

Hydrogen bonding

Overlapping of orbitals

Which of the following statements is not correct regarding bonding molecular orbitals

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Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbitals contributes to the attraction between atoms

Bonding molecular orbitals are formed when the electron waves undergo constructive interference

Electromotive force of the cell is the

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Difference of two electrode potentials

May be sum or the difference of two electrode potentials

Sum of two electrode potential

Depends upon the nature of the cell

Both CH4 and NH3 are four electron pair system the angles of CH4 and NH3 are 109.5^o and 107.5 ^o respectively. This deviation is due to.

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Hydrogen bonding in ammonia

Lone pair attraction

Lone pair occupy more space and repel to other bond pairs

Lone pair lone pair repulsion

Which of the following has coordinate covalent bond.

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NH4

NaCl

HCl

AlCl3

In H2SO4the oxidation number of 'S' is

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+2

+6

+8

+4

Which of the following particles would on losing an electron has its outermost p-orbital as half filled

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Nitrogen atom

O⁺ion

P^-1ion

S⁺¹ion

Which of the hydrogen halides has the highest percentage of ionic character.

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HF

HBr

HCl

HI

_________ 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

How many molecules of CO2 are formed by burning 12 g carbon with excess of oxygen.

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3.01 x 10²³

1 x 10²³

6.02 x 10²³

1.03x 10²³

The e/m value for the positive rays in maximum for the gas.

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Helium

Oxygen

Nitrogen

Hydrogen

A negative deviation from Raoult's law in solution means, the solution has

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High boiling point and high vapour pressure

High boiling point and low vapour pressure

Low boiling point and low vapour pressure

Low boiling point and high vapour pressure

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