Question # 1

The potential difference set up at 25 C and 1 atm when clectrode is dipped m Tis one molar ionic sohution is called

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Single electrode potential

electrode potential

Standard electrode potential

Standard hydrogen electrode

When 1-butene reacts with bromine, the product formed will be

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1, 3-dihydroxy butane

But-1, 2-diol

1, 3-dihydroxy butan-diol

1,2-dibromo butane

If a = b = c and x = y = z 90° then crystal structure is

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Cubic

Tetragonal

Orthorhombic

Triclinic

In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:

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CI>Br>I

I>Br>Cl

Br>CI>I

I>CI> Br

A basic buffer solution can be prepared by mixing

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Strong acid and its salt with weak base

Weak base and its salt with strong acid

Strong base and its salt with weak acid

Weak acid and its salt with strong base

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

Which one of following property is not true about alkali metals?

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Strongest bases due to their hydrides

Low ionization energy

Oxidation number more than +1

Form acidic oxides

London forces are more affective at

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low temperature

high temperature

low pressure

low temperature and high pressure

CuSO₄5H₂O crystals belong to

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triclinic

cubic

tetragonal

orthorhombic

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

Bragg's law is given by equation

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n λ = 2 θ sin θ

nλ = 2 d sin θ

2nλ = d sin θ

n λ= 1/2 d sin θ

2,4,6-Trinitrophenol is commonly called as

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Phthalic acid

Tartaric acid

Malonic acid

Picric acid

In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their

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Oxidation states

Reduction states

Electrode

Negative charges

The alkaline hydrolysis of bromoethane shown below gives alcohol as the product: H3C-CH2-Br-------H3C-CH2-OH

The reagent and the condition used in this reaction may be:

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H20 at room temperature

KOH in alcohol

Ethanol. heat

Dilute NaOH(aq) warm

When liquid water changes to ice, the volume expands. The expansion in volume is

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5%

7%

9%

12%

Which one of the following will react with bothethand and ethanoic acid at room temperature

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CaCO3

CuO

Na-metal

CH3OH

Molar volume of CO₂ is maximum at

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NTP

0°C and 2.0 atm

127°C and 1 atm

273°C and 2.0 atm

Formalin contains-------% alcohol.

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37

80

8

52

Correct statement about Nucleophilic substitution bimolecular is

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Transition state is formed

Inversion take place

It is two step reacticn

Both a &c

The relationship between volume of a given amount of gas and prevailing conditions of temperature and pressure are:

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Charle's law

Graham's law

Boyle's law

Gas laws

Which of the following statement is correct if the intermolecular forces in liquids A,B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

The molecular speed Crms of gas is

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Independent of temperature

Proportional to the absolute temperature

Proportional to the square root of absolute temperature

Proportional to the square of absolute temperature

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

The phenomenon in which sudden expansion of a gas causes cooling is called

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evaporation

cooling

Joule Thomson effect

sublimation

At higher temperature isotherm moves away from y-axis because of increase in

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Pressure

Number of moles

Volume

Mass

All of the following have cleavage planes except:

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molecular crystals

metallic crystals

covanent crystals

ionic crystals

A substances has M_r74.5, a melting point of 772°C and a boiling point of 1407°C. It conducts electricity only when in the liquid state.What is the bonding present in this substances?

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covalent

ionic

metallic

hydrogen bonding

Van der Waals equation explains the behaviour of

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Real gases

Mixture of gases

Ideal gas

Diatomic gases

Octet rule is not allowed in the formation of

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NF3

B.CF4

CCI4

PCI5

Covalent bonds are

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directional

Bidirectional

Multidirectional

Non directional

Catalyst used for ammonia synthesis is

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Cu

Co

Zn

Fe

The potential of SHE is taken as zero which is avalue

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Reference

Arbitrary

Exact

Experimental

The gecko a small lizard can up a smooth glass window the gecko has millions of microscopic hairs on its toes and each hair has thousand of pads at its tip the result is that the molecules in the pad are extremely close to the glass surface on which the gecko is climbing.

What is the attraction between the gecko is climbing.

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co-ordinate bonds

covalent bonds

ionic bonds

van der Waals forces

The correct value of the gas constant R is close to

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0.082 litre-atm K^-1 mol^-1

0.082 litre-atm^-1 K mol

0.082 litre-atm K

0.082 litre-atm^-1 K mol^-1

AgNO₃ is a polymorphic having two different crystalline forms which are

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cubic, tetragonal

monoclinic, hexagonal

cubic, orthorhombic

orthorhombic, rhombohedral

At higher temperature isotherm of Boyle's law moves away from both axis, is due to increase in

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pressure

No. of moles

Volume

all of these

The rate of diffusion of a gas is proportional to

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P /√d

√p/d

P/d

√ P/d

Which of the elements has seven electrons in d-subshell?

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Zn

Co

Cu

Fe

Acording to the kinetic theory of gases

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The pressure exerted by a gas is proportional to mean square velocity of the molecules

The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

The root mean square velocity is inversely proportional to the temperature

The mean translational KE of the molecule is directly proportional to the absolute temperature

If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula

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CH2

C3H6

C2H4

C4H8

Which of the following alkyl halides undergoes SN1 reaction fastest

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Methyl chloride

Isobutyl chlorido

Ethy l chloride

Tertiary butyl chloride

Whenever a reaction is endothermic, then it means that

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Heat is transferred system to the surrounding

Heat is transferred from surrounding to the system

Heat content of the products is less than that of reactants

Heat content of the reactants is greater than the products

The pressure of gas at constant temperature in a container of 2dm3 is 10 atm what will be its final pressure if it is connected with 10 dm3 container

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2 atm

1.6 atm

5 atm

I atm

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

Coordination number of Zn and ZnS (Zinc blends) is

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4

6

2

None of these

During the electrolysis of Fused NaCI, the products are

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Na and H2

Na and Cl2

Na and O2

H2 and Cl2

d-d transition cannot be observed in

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Cr

Cu

Mn

Zn

Rusting of iron is the example of

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Fast

Slow

moderate

depends upon conditions

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

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Solid

Gas

Liquid

Plasma

_{What is name of hydrated variety of quartz?}

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Rose quartz

Smokey quartz

Silica

Opal

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

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

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Hydrogenation

Dehydrogenation

Dehydrohalogenation

Oxidation

D-block elements are also called

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Non-typical transition element

Outer transition elements

Abnormal transition elements

Inner transition

Density of a gas is usually expressed in

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Kg m³

Kg dm³

g dm^-3

g cm^-3

Gas is enclosed in a container of 20cm3 with the moving piston. According to kinetic theory of gases, what is the effect on freely moving molecules of the gas if temperature is increased from 20°C to 100C.

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Colliding capability of molecule will become lower

Pressure will become one half

Temperature has no effect on freely moving molecules

Volume will be increased

At freezing point of water, the density decreases due to

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change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

An element that is not an essential par of proteins is

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O

N

H

S

The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute

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Oxidation

reduction

Redox reaction

electrolysis

The value of R in term of dm³torr k^-1mol^-1

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62400

62.4

8.313

0.0821

Which of the following molecules have a permanent dipole

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CH₄

CHCl₃

CCl₄

CO₂

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1