Question # 1

Which one of the following statements about positive ions is incorrect?

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they are also known as cations

they are formed when electrons are removed from atoms

they are larger than the atom from which hay were formed

they are smaller than the atom from which they were formed

An example of bydrolase is

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Amylase

Lipase

Fumarase

A,C

The graph between P onγ-axis and 1/V at x-axis for a given mass of a gas at temperature T is a

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straight line

curved upward

curved downward

circular

Elements of II-A group are called alkaline earth metals due to the reason that

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they occur in earth only

they form divalent cations only

they have ns2 electronic configuration

their oxides and hydroxides are alkaline in nature and metals are present in earth crust

Which of the following liquid has highest bolling point

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HCI

HBr

H2O

Br2

Which of the following shows group IIIB

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Zn, Cd. Hg

Cu. Ag. Au

Sc. Y. La

Ni. Pd. Pt

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

If the reaction "P+Q→R+S' is deseribed as being of zero order with respect to P, it means that

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P is catalyst in this reaction

P molecules do not possess sufficient energy to react

The concentration of P does not change during the reaction

The rate of reaction is independent of the concentration of P

Compound X & Y give effervesce with Na2CO3, solution. X gives a white ppt with ammonical AgNO3 while Y gives sweet smell compound on heating with alcohol X &Y are

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Formic acid & acetic acid

Acetone & formic acid

Acetaldehy de & acetic acid

Acetic acid & acetone

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

The process in which solid is directly coverted into gaseous state is called

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evaporation

boiling

sublimation

transformation

The total number of 3d-series transition elements is

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10

40

14

58

The rate of reaction for a reaction is 30 mol dm-3sec-1 if the product of concentration of 10.reactant is unity the specific rate constant is

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25

2.5

30

15

Which of the following decides the reactivity of alkyl halides?

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C-C bond strength

C-H bond strength

C-X bond strength

Electronegativity difference

Zn has

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Zero unpaired electrons

Three unpaired electrons

Five unpaired electrons

One paired electrons

Which noble gas is used in mixture used for breathing by divers?

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Ge

Ar

Kr

He

Phenol is colourless, crystalline and solid

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Hygroscopie

Deliquescent

Moistening

Odourless

Slight oxidation of primary alcohol eives

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Ketone

Aldehyde

-Organic acid

An ester

In which system hydrogen bonding is not present

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solution of ethanol in water

linking of helix in protein molecule

structure of ice

solution of NaCl in benzene

Which of the following is a strong acid

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CH3COOH

C2H5OH

HCOOH

Phenol

Which is the correct order of boiling points

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structure of ice

solution of ethanol in water

solution o fNaCl in benzene

linking of helix protein molecule

When HCI gas is passed through saturated solution of rock salt, the solubility of NaCl

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Increases

May increase or decrease

Decreases

None of these

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

The angle between the unhybridized 2pz orbital and the three sp2 hybrid orbitals in ethene is

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180°

120°

90°

60°

Formalin is used as:

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Fungicide

Germicide

Sterilizing of surgical instruments

All three

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

Glucose is converted into ethanol by the enzyme present in the yeast

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Urease

Zymase

Invertase

Sucrase

The acidity of phenol is due to its

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Nature of Benzene

Double bond in benzene ring

Natute of phenoxide ion

Hydroxyl group

which one of the following exhibits intermolecular hydrogen bonding?

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HF

HC

HBr

HI

A molecule which contains two lone pairs and two bond pairs of electrons in valence shell of central atom, geometrical shape of molecules will be

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Tetrahedral

Trigonal pyramidal

Angular

Linear

The volume of gas depends upon the ______ molecules

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Size of

Molecular weight

Space between

Both a and b

The kinetic energy of 4 moles of nitrogen gas at 127°C is? cals.(R = 2 cal mol^-1 K^-1)

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4400

3200

4800

1524

The instrument that is used to measure the pressure of a gas is called

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viscometer

photometer

barometer

stalagmometer

The values of ∆H for the process l(g)+e-1--------->
I-1(g) is:

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>0

<0

0

None

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

What is the co-ordination number of face centered cubic structure?

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12

8

6

10

Denaturation of proteins is often characterised by

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Loss of biological activity

Aiways being irreversible

Being ereater the lower the temperature

Changes in primary structure

When graph is plot between P and 1/V at constant temperature. A straight line obtains which move toward ______ when temperature increase

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Pressure axis

Volume axis

1/V axis

1/P axis

Which of the following is the simplest form of matter?

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Gaseous state

Liquid state

Solid state

All of above

In metallic crystals the atomic orbitals combine to produce a large number of closely bands of energy according to

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electron pool theory

molecular orbital theory

valence bond theory

electrostatic force of attraction

Which ion has maximum number of unpaired electrons in 3d subshell and shows maximum paramagnetic behavior?

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Cr+3

Ni+2

Co+2

Fe+3

Oils and fats belong to the class of

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Alcohols

Hydrocarbons

Acids

Esters

Which of the following ketone will not give iodoform test

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Methyl isopropyl ketone

Dimethyl ketone

Ethyl isopropyl ketone

2-hexanone

Which of the following liquid has higher boiling point?

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HCl

HBr

H₂O

Br₂

Liquefaction of gas can only be carried out if the:

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without caring for the value critical volume at critical stage

the temperature is more than critical and pressure is 1000 atm

the temperature is below the critical and pressure is very high

temperature is above the critical temperature and pressure can have any value

Which of the following reagents reaet in same manner with HCHO, CH3CHO andCH3COCH3

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HCN

Cu2(OH)2/ NaOH

Ammonical AgNO3

Cu(OH)2 only

The attractive forces which exist between ionic compounds and water molecules are

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dipole-dipole forces

ion diopole forces

istantaneous dipole-induced dipole forces

dipole-induced dipole forces

The Kw. of water at 25 C° is given by

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10(-7)

10(-10)

10(-12)

10(-14)

The measurement of enthalpy change at standard conditions means that we should manage the measurement at

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24°C at 1 atm

25°C at 1 atm

0C° at 1 atm

100C° 1 atm

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

In [Ti (H2O)]3+ which colour is transmitted

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Yellow

Blue and red

Blue and yellow

red and yellow

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

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

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

lonization of KCIO3. is suppressed by

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Increasing temperatuse

adding KCl

adding NaNO3

Decreasing temperature

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

Aniline is the derivative of the benzene containing the

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Hydroxyl group

Amino group

Amido group

Imido group

Octet rule is not allowed in the formation of

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NF3

B.CF4

CCI4

PCI5

The value of Kc for H2O at 25C° is

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1x10 (-14)mole dm-3

14 mol dm-3

1.86×10(-16) mol dm-3

1.0x10 (-7)moldm-3

Which of the following transition metal forms colourless compounds in +4 oxidation state?

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Ti

Cr

Cu

Zn

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice