Question # 1

Zinc reacts with dilute acids to liberate hydrogen. This is because:

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Zn2+ ion is a powertul osidising agent than H' ion

H+ ion is a powerful oxidising agent than Zn ion

Zn2+ ion is a powerful reducing agent than H' ion

H+' ion is a powerful reducing agent than Zn- ian

The heat of hydrogenation of most of the alkene is about

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120 kJ/mol

100 kJ/mol

140 kJ/mol

105 kJ/mol

The compound that reacts the slowest in Lucas test

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1-Pentanol

sec-butyl alcohol

3-Pentanol

ter- butyl alcoho

The volume of 2.8 g of CO at 27°C and 0.0821 atm is

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30 dm³

3 dm³

0.3 dm³

1.5 dm³

The reagent used to distinguish between ethanol and propanal is

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I2/ NaOH

Benedict's reagent

LiAIH

sodium nitroprusside

An alkyl halide reacts with NH3 to give

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Amide

Cyanide

Amine

Aniline

A gas is heated in such a way that its volume and absolute temperature both are doubled. the pressure of gas:

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Becomes 4 time

Becomes half

Becomes 2 time

Remains same

Real gases deviate at low temperature from ideal behaviour due to

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there is transitional motion of molecule

the collissions between the molecules are decreased

volume of gas is decreased

the inter molecular attractive forces become significant

Equal volumes of all gases at STP contain equal no of molecules is called

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Dalton's law of partial pressure

Graham'a law of diffusion

Avogadro's law

None

Point out that which is not an application of liquid crystals?

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Source of energy

In display of electrical devices

For skin thermography

As temperature sensor

The collision which results in chemical reaction

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Effective collision

Ineffective collision

Useless collision

All of the above

2-propanol shows-----isomerism with 1-propanol

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Chain isomerism

Positional isomerism

Metamerism

Geometrical isomerism

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

Geometry of simple molecule with sp2 hybridization

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Triangular planar

Trigonal

Square planner

Pyramidal

Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0°C

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546°C

200°C

546 K

273 K

Which one of the following is not true relationship

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The potential of SHE is taken as zero which is avalue

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Reference

Arbitrary

Exact

Experimental

Correct relationship b/w Kc and Kp can be written as

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Kp=, Kc(R)∆n

Kc=Kp (RT)∆n

Kp.= Kc.(RT)∆n

Kp=Kc (R/N)∆n

Which of the following molecules should be more volatile

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HF

HCl

HBr

HI

London dispersion forces are the only force present among the:

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molecules of water in liquid state

atoms of helium in gaseous state at high temperature

molecules of solid iodine

molecules of hydrogen chloride gas

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

Which one of the following is an appropriate indication of positive iodoform test?

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Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

Which one among the following is not a good leaving group

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HSO4-

CI-

OH-

Br-

An element that is not an essential par of proteins is

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O

N

H

S

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

Equal volume of all gases at same temperature and pressure contain number of molecules

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different

multiples

equal

in fractions

One of the following does not give the flame test. Which is that

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Sr

Bа

Be

Na

Variable Oxidation state of is related to transition elements

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empty d-subshells

Completely filled

Partially filled d-subshell

d-d transition

Dehydrohalogenation of alkyl halides happens in the presence of

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Pd

Ni

Zn

KOH/alcohol

Proteins have linkage between amino acids

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imide

amide

ester

ether

Among the following molecules, which one has coordinate covalent (dative) bond?

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CCI4

CO2

CO

CH4

In gasses and liquid, temperature is the measure of:

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Average transnational kinetic energies of molecules.

Average vibrational kinetic energies of molecules.

Average rotational kinetic energies of molecules.

None of above.

Based on the physico-chemical properties, proteins may be classified into the following types

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Simple proteins

Compound proteins

Derived proteins

All of the above

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

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5%

7%

9%

12%

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

Solids in which atoms, ions or molecules are not regularly arranged are

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crystalline solid

amorphous solids

liquid crystals

low melting points

The maximum possible number of hydrogen bonds in which a H₂O molecule can participate is:

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1

2

3

4

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

1, 3, 5-Pentanetriol has secondary carbon

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3

1

2

Zero

CuSO₄5H₂O crystals belong to

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triclinic

cubic

tetragonal

orthorhombic

If allowed to expand, the gases suddenly

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heat up

move randomly

react

cool down

An example of ion-dipole force is solution of

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NaCl in water

Glucose in water

Bromine in benzene

Ethanol in water

Which of the following liquid has higher boiling point?

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HCl

HBr

H₂O

Br₂

A covalent bond may be

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100% covalent

Partial ionic

100% ionic

Both a and b

Group of element belongs to IIB group

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Zn. Cd. Hg

Cu. Ag. Au

Sc. Y. La

Ni. Pd. Pt

At STP,a container has 1 mole of Ar,2 moles of CO₂,3 moles of O₂ and 4 moles of N₂.Without changing the total pressure if one mole of O₂ is removed,the partial pressure of O₂

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Is changed by about 26%

Is halved

Is unchanged

Change by 33%

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

Which is trigonal crystal

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CaSO₄. 2H²O

MgSO₄

NaNO₃

All

Amorphous substance show

(i) Short and long range order

(ii) Short range order

(iii) Long range order

(iv) Have no sharp melting point

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(i) and (ii) are correct

(ii) and (iv) are correct

(ii) (iii) and (iv) are correct

(i) and (iv) are correct

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

The solid particles posses only ______ kinetic energy

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Translational

Rotational

Viberational

Circular

Which of the following will undergo nucleophilic addition reaction more easily?

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Aldehyde

Alkene

Aldehyde and ketone equally

Neither aldehyde nor alkenes

How should the conditions be changed to prevent the volume of a given gas from expanding when its mass increased?

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temperature and pressure both ara increased

temperature and pressure both are lowered

temperature is lowered and pressure is increased

temperature is increased and pressure is descreased

What is distilled first?

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Liquid CO₂

Liquid N₂

Liquid O₂

Liquid H₂

Octet rule is not allowed in the formation of

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NF3

B.CF4

CCI4

PCI5

The mono atomic gases are

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Halogens

Noble gases

6h group elements

Nitrogen and oxygen

The rate of reaction between A and B increases by a factor of 100, when the concentration of A is increased 10 folds, the order of reaction with respect to A is

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10

1

4

2

What is the formula of dolomite?

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CaMg3 (SiO3)4

MgCO3

MgCO3.CaCO3,

MgSO4

A mixture of H₂, H2 and CH₄has total number of 0.51 mole and total pressure of 1 atmosphere. If the mass of H₂is 0.8 gram, then its partial pressure is

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0.4 atm

0.6 atm

0.776 atm

0.667 atm

The maximum oxidation state of Mn is

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+6

+7

+5

+4