Question # 1

Which one of the following is not true relationship

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What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

What is true about an alcohol and phenol

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Both are more acidic than water

Both react with NaOH

Both produce CO2 with Na2CO3

Both, produce H2 with Na

Which reactant does hnof liberate water on reaction with alcohol

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NH3

K2Cr2O7/15H2O

HCI

PCI3

A compound z' decolorizes bromine water and produces white ppt. The compound 'z'is

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Alkane

Alcohol

Phenol

Benzene

Rise in vapour pressure of water from 30 to 60°C is only 32 torr to 149.4 torr (117.4 torr) but from 60 to 90°C is 149.4 to 527.8 torr (378.4 torr).it is due to

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change in geometry of H₂O molecules at higher temperature

decrease in volume takes place at higher temperature

vapour pressure of liquids increases rapidly closer to their boiling points

boiling starts

Proteins have linkage between amino acids

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imide

amide

ester

ether

The existence of an element in more than one form is called

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allotropy

isomorphism

polymorphism

isotropy

Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:

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2

4

6

8

.Both aldehydes and ketones are planar to the neighborhoods of carbonyl (C-0) group. Which one of the following bonds is distorted towards the oxygen atoms?

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pi-bond of C and O

Sigma bond of C and O

Sigma bond of C and H

Sigma bond of C and C

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

The oxidation of SO2 to SO3 is exothermic reaction. The yield of SO3 will be maximum if

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Temperature is increased and pressure is kept constant

Temperature is reduced and pressure is increased

Both temperature and pressure are increased

Polarizability is responsible for intermolecular forces and it

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increases down the group

decreases down the group

almost remains the same

increased along a period

Abumins and globulins are defined as

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Derived protein

Conjugated protein

Fibrous protein

Simple Protein

In Boyle's law which of the following pair is variable:

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Temperature and quantity of a gas.

Pressure and volume.

Volume and quantity of a gas.

Pressure and quantity of a gas.

In homocyclic compounds the ring consists of

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Carbon and oxygen atoms

Carbon and nitrogen atoms

Only carbon atoms

Carbon atoms with one hetero atom

The enzymes that bring about exchange of functional groups like phosphate are called

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Ligases

Lyases

Isomerases

Transferases

Ethene is produced from ethyl chloride by reacting with alcoholic KOH. The process is called

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Hydrogenation

Dehydrogenation

Dehydrohalogenation

Oxidation

Gases show uniform behavior towards their:

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Internal conditions.

External conditions.

Internal and external conditions.

None of above.

Some of crystals are good conductors of heat and electricity, they may be

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ionic in nature

of metallic character

covalent in nature

of molecular nature

By increasing temperature,the transition from a gas to an ionized gas gives free electrons called:

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UV radiation

gas phase

plasma

vapour density

In which one of the following does the central atom not possess an 'octet' in its outer shell?

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BH₃

CH₄

NH₃

H₂O

Aniline is the derivative of the benzene containing the

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Hydroxyl group

Amino group

Amido group

Imido group

Which of following factor affect vapour pressure of a liquid?

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temperature

inter molecules forces

size of the molecules

all of these

Indicate the number of open chain isomers of C6H14

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4

5

6

7

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In the presence of hot alkaline potassium permanganate solution 2-butene will give

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Formic acid +acetic acid

Two moles ethanoic acid

Two moles of methanoic acid

Ethylene glycol

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

Hydrogen bonding is involved in

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Solubility

Detergents

Biological molecules

All the above

Gases exert pressure on walls of container because the gas molecules:

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Obey gas laws.

Have definite volume.

Collide with the walls of container.

Collide with each other.

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:

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M/V

RT/M

PM/RT

V/M

Ethene C₂H₄and N₂gases diffuse at the same rate at room temperature. it is due to the reason

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these are non polar gases

their molecular masses are same

both are covalent molecules

both have multiple bonds

Critical temperature of argon's gas is low. the reason is that

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it contains four lone pairs

it is mono atomic gas

it has as smell signed

its polarizability is low

The oxidation state of transition elements is usually

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Variable

Single

Constant

Infinite

Buffer solutions are used in except

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Clinical analysis

Nutrition

Soil science

Qualitative analysis

One of the following metals is the most reactive and form super oxide. Indicate that

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Mg

K

Be

Li

A real gas most closely approaches the behaviour of an ideal gas at

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15 atm. and 200 K

1 atm. and 273 K

0.5 atm.and 500 K

15 tm, and 500 K

An ideal gas, obeying Kinetic theory of gases cannot be liquified, because

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its critical temperature is above 0°C

its molecules are relatively small in size

It solidifies before becoming a liquid

Forces acting between its molecules are negligible

A student mixed ethyl alcohol with small amount of sodium dichromate and added it to the hot solution of dilute sulphuric acid. A vigorous reaction took place. He distilled the product formed immediately. What was the product?

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Aceton3

Dimethyi ether

Acetic acid

Acetaldehyde

In beta elimination reaction

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carbon number changes

unsaturated compound is formed

hybridization. ofC remains same

pi bonds are decreased

Benzene cannot undergo the ------- directly

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Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

Polarity of a molecule is expressed in terms of

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Bond strength

Dipole moment

Bond length

Shape

At constant temperature, volume of given mass of gas in inversely proportional to pressure on it. This statement is according to:

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Hook's law

Graham's law

Bolye's law

Charle's law

The isomerism in which the compounds differ with respect to functional group but have same molecular formula is called

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Metamerism

Functional group isomerism

Position isomerism

Chain isomerism

Which volume of gas has minimum value

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Apparent volume

Actual volume

Excluded volume

All have equal value

Critical temperature for a gas depends upon

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Shape of molecule

Size of molecules

Inter molecular forces

All of these

A doubly bonded carbon is

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cannot be sp2 hybridized

can be sp hybridized

can attach with three carbons

can attach with three hydrogens

The minimum temperature recorded by Kelvin scale is:

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273K

373K

Absolute scale is unable

0K to record this temperature

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

The state of matter which exist only within a relatively narrow range of temperature and pressure

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Solid

Gas

Liquid

Plasma

The sun is a ball of plasma heated by nuclear fusion is

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1.0 million km

2.0 million km

1.5 million km

2.5 million km

lonic solids are characterized by which one of the following properties

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moderately low pressure

high vapour pressure

good conductivity in solid state

solubility in polar solvents

Stalagmometer is used to measure

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the resistance to flow of a liquid

capillary action of a liquid

Meniscus of the liquid

surface tension of the liquid

What will be the pH of 1.0 mol dm -3 of H2X, which is only 50% dissociated

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1

0

2

Less than 0

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

Van der Waal's forces exist in

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Polar compounds

Non-polar

Covalent

All types of atoms and molecules

Formation of Picric acid from phenol needs heating, one possible reason for it is

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acidity of phenol

e- donating nature of-OH

acidity of picric acid

e- with drawing effect of- NO2

Ethene can give all of the following reactions except

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Addition

Free radical substitution

Hydrohalogenation

Hydration

Equal masses of CH₄and O₂are mixed in a 10 dm³container at 25°C. The partial pressures of CH₄and O₂are in the ratio of

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1 : 2

2 : 1

1 : 1

2 : 3