Question # 1

All the metal shine when they are freshly cut The reason is

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the conductivity of the metal is increased

the process of cutting gives energy to the metal atoms

the electrons become less delocalized according to valance bond theory

the electrons are excited at higher energy levels and emit the photons when they fall back

All the following statements are incorrect except:

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all of the gases cannot be liquefied

increase of pressure will not decrease the inter molecular distance in a gas

gas molecules do not attract each other at very low temperature

actual volume of a gas is not negligible at very pressure

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

The critical temperature of NH₃ is greater than CO₂ due to its:

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Greater polarity

Stable polarity

Lesser polarity

None of above

Protein may have

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Primary structure

Secondary structure

Tertiary structure

All of these

At same temperature which substance has high kinetic energy:

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Liquid water

N₂gas in a container

Solid piece of iron

Solution of alcohol and water

Mathematically, Boyle's law is indicated as:

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VT = K

PT = K

PV = K

None of these

Total heat content of a system is called

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Internal energy

Entropy

Enthalpy

All of these

Which one of the following elements is not an alkali metal?

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Na

Sr

Cs

Rb

What s the boling point of H2O at the peak of Mount Everest?

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101 C°

69°C

100 C°

98° C

Which of the following is woody raw material used for making pulp and paper:

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Eucalyptus

Bagasse

Wheat straw

Cotton linter

Each vertical column of the periodic table includes elements with chemical characteristics that are in general

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Identical

Similar

Different

Similar as well as different

Catenation is a process in which carbon shows the properties of making

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Multiple bonds

Hybridization

Long chains or rings of carbon atom

Showing isomerism

The order of decreasing ease of reaction with ammonia is

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Anhydrides, esters, ethers

Anhydrides, ethers, esters

Ethers, anhydrides, esters

Esters, ethers, anhydrides

What causes nitrogen to be chemically inert?

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Multiple bond formation in the molecule

Absence of bond distance

Short internuclear distance

High bond energy

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBh₄or LiAH₄?

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1-Propanol

2-Propanol

2-Methyl2-Proponal

Ethanol

Ionization energies increase from left to right along the period due to

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Increase in nuclear charge

Repulsion of electron increases

Repulsion of protons increase

Atomic size increase along the period

The equilibrium constant in a reversible chemical reaction at a given temperature

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Depends on the initial concentration of the reactants

Depends on the concentration of one of the products at equilibrium

Does not depend on the initial concentration of rectants

It is characteristic of the reaction

The mathematical form of fist law of thermodynamics is

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Series starting from57La,42Hf -80Hg is in the period:

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4th

5th

6th

7th

A white precipitate ofsilver chlorideimmediately formed on additionof :

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Silver nitrate solution to sodium chloride solution.

Silver chloride solution to sodium nitrate solution.

Silver nitrate solution to potassium chloride solution

Silver nitrate solution to hydrogen chloride solution.

The elimination of hydrogen halide from adjacent carbon atoms is called

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Dehydrogenation

Hydrogenation

Dehydrohalogenation

Hydrohalogenation

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