Question # 1

When water freezes at 0°C, its density decreases due to

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cubic structure of ice

empty spaces present in the structure of ice

change of bond lengths

change of bond angles

The strongest conjugate base is

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OH-

CH3O-

C6H5O-

CH3COO-

Which of the following gases have lowest density at room temperature

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CO

N₂

Ne

NH₃

Polar ice caps and glaciers consists total earth water:

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1%

2%

3%

4%

There is more deviation in the behaviour of a gas from the ideal gas equation PV = nRT

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At high temperature and low pressure

At low temperature and high pressure

At high temperature and high pressure

At low temperature and low pressure

An ideal gas cannot be liquefied because:

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It solidify before becoming a liquid

Its critical temperature is always above 0^oC

It is molecule are relatively smaller in size.

Forces operative between its molecules are negligible

Lonic solids are characterized by:

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low melting points

_{good conductivety in solid state}

high vapour pressures

solubility in polar solvents

One of the following is a ionic solid. Which is that?

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Fe

KBr

Diamond

Cr

State of hybridization of carbon in the carbocation is

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sp3

sp

sp2

dsp2

Which of the following gives positive haloform test and positive Fehling solution

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Acetone

Echanol

Acetaldehyde

Formaldehyde

Formamide is formed by the reaction of which acid with ammonia

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Oualic acid

Formic acid

Ethanoic acid

Propanoic acid

Alkanes are least reactive towards:

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Acids and bases

Reducing agents

Oxidizing agents

All of these

A zero order reaction is one in which :

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Rate is not affected by changing concentration of reactants.

concentration of reactants do not change with the passage of time.

Reactants do not react.

One reactants in large excess.

Alpha rays consist of:

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Neutrons.

Helium nucleus.

Protons.

Hydrogen nucleus.

A colloidal gel is:

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3Ca, Al₂O₃

CaSO_2.2H₂O

3CaAl₂O₃.3CaSO₄.2H₂O

3Ca.Al₂O₃.6H₂O

Which structure shows a primary alcohol

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The specific conductance of 0.1 M NaCl solution is 1.06 x 10^-2ohm^-1mol^-1. Its molar conductance in ohm^-1cm²mol^-1is

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1.06 x 10²

1.06 x 10³

1.06 x 10⁴

53

The wave length of visible light is 500 nm. In S.I. unit this value is

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5 x 10^-8m

5 x 10^-9m

500 x 10^-7m

500 x 10^-9m

Heating a mixture of sodium benzoate and soda lime gives

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Methane

Benzene

Sodium bezoate

Calcium benzoate

All covalent bonds formed between the two atoms are non-polar when

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Covalent bond between two non-metal atoms

Covalent bond between metal and non-metal

Covalent bond between two atoms of same element

Covalent bond between metal atoms

Which compound is both chiral and acidic

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The silver bromide in hypo (Na₂S₂O_{3) solution is}

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Soluble

Not soluble

Precipitated

Not effect

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