Question # 1

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

Theoretically, the temperature at which volume of gas become equal to zero is called

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Boiling point of water

Zero absolute

Zero Kelvin

both B and C

The relative rates of diffusion of a gas (Mol.wt.=98) as compared to hydrogen will be

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1/7

1/5

1/4

1

An ideal gas obeying kinetic gas equation can be liquefied if

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Its temperature is more than critical temperature

Its pressure is more than critical pressure

Its pressure is more than critical pressure but temperature is less than critical temperature

It cannot be liquefied at any value of P and T

Equal volumes of ideal gases contain equal number of molecules at:

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Same temperature

Same pressure

Same environmental conditions

Both (A) and (B)

Which thermometer will have its reading 273 degrees greater than that of thermometer C?

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A

B

B has 273 degrees greater than A

C has greater reading than all other thermometers

A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is

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50kJ

100 kJ

150kJ

5000 kJ

Diffusion of different species is due to difference of

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potential energy

temperature

density

all the above

A semiconductor of Ge can be made p-type by adding

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Trivalent impurity

Tetravalent

Pentavalent impurity

Divalent impurity

All gases can be compressed by:

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Keeping constant pressure

Decreasing pressure

Increasing pressure

None of above

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

Graham s law refers to

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Boiling point of gases

Gas compression problems

Gaseous diffusion

Volume changes of gases due to change in temperature

Mercury does not wet the glass because of

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repulsion

weak cohesive force

high viscosity

capillary action

The compound that has zero dipole moment is

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HCl

H₂S

NH₃

CH₄

The major binding force of diamond,silicon and quartz is

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Electostatic force

Electical attraction

Ceobalent bond force

Non convalent bond force

Ionic solids with defects,contain

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Equal number of cation and anion vacancies

Interstitial anions and anion vacanies

Cation vacancies only

Cation vacancies and interstitial cations

Volume of O₂gas at 0°C is 273 cm³, then volume of O₂gas at -10°C is

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263 cm³

163 cm³

173 cm³

73 cm³

Which one of the followings has polar covalent bonds hut is overall nom-polar molecule:

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HF

CO₂

CH₄

N₂

Value of gas constant R is

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8.314 J K^-1mol^-1

0.082 J K^-1mol^-1

273.15 J K^-1mol^-1

101325 J K^-1mol^-1

Charle's law only obeys when temperature takes in ______ scale

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Celsius

Fahrenheit

Kelvin

Rickey

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

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

Energy of atom in compound is

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Higher than individual atom

Lower than individual atom

equal to individual atom

Impossible to predict

In NaCl cyrstal Na⁺ion is surrounded by how many ions of Cl^-

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4

6

8

10

By increasing pressure two times and decreasing temp. two times the volume of gas

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Volume increases 4 times

Volume decreases 4 times

Volume increases 2 times

Volume decreases 2 times

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

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H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

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

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

To cook the food at a high mountain is difficult as compared to at sea level. The reason is that:

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the temperature at the top of the mountain is low

the density of water decreases at the mountains

the boiling point of water decreases at the mountain

the hydrogen bonding in water changes with the change of height

Succinic thiokinase is an enzyme of the type

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mutase

peroxidase

ligase

lyase

Ethanoic acid reacts with all of these to produce water except

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Ethanol

Sodium

Caustic soda

Sodium hydrogen carbonate

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

SN2-reactions can be usually observed in

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Primary alkylı halide

secondary alkyl halide

Tertiary alkyl halide

Both A. and B

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

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Cubic

Tetragonal

Orthorhombic

Triclinic

Change in enthalpy (∆H) of a system can be calculated by

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∆H=∆E - PV

ΔH =ΔE +q

∆H = ∆E - q

∆Η = ΔΕ + P∆V

According to Boyle's law at constant temperature, the product of pressure and volume of a given mass of gas is:

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a constant

fraction

whole number

a multiple

The original volume of a gas at 0° is 273 cm³at constant pressure, its volume at 273°C becomes

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zero cm³

546 cm³

446 cm³

346 cm³

In which of the following compounds H-binding is not present?

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ethanol

ether

water

ammonia

If reactants are conductor of electricity, then method is used to measure the change in concentration of reaction

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Optical rotation

Refractrometric

Dilatometric

Electrical conductivity

Allotropic forms of carbon are:

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five

three

four

two

2-propanol on Oxidation gives

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Aldehyde

Carboxylic Acid

Ketone

Alcohol

The critical temperature of CO₂______°C at 73 atm critical pressure

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21.142

28.892

31.142

35.452

Octyl acetate has the flavor of

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Orange

Pineapple

Banana

Apple

The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:

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H2O molecules are small-sized

the bond angles at oxygen atom are different

C2H5-group is electron donating

the number of H-bonds are greater in H20, than C2H5-OH

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

Which of the following is the simplest form of matter?

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Gaseous state

Liquid state

Solid state

All of above

Which one is not related with evaporation

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Continuous

Cooling

Exothermic

Spontaneous

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

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

Which of these has at least one d electron

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Sc+3

Mn+7

Ti+4

Cr+3

Which one of following statement about three about three states of matter is incorrect?

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in solids the particles vibrate about fixed positions

energy is released when a gas turns back to a liquid

particles in gases move in a random manner

the closer particles are together, smaller the force of attraction between them

Electrolytic products of dilute aqueous solution of sodium sulphate is

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Na. SO2

H2. S02

Na. O2

H2,O2

Which pair of the gases doesn't obey Dalton's Law of partial pressures

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H₂and O₂

N₂and O₂

H₂S and H₂

NH₃and HCl

A gas is heated in a closed vessel. Which of the following statement is not true for the gas?

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the intermolecular forces between particles weaken

the kinetic energy of particles increases

the total internal energy of the gas remains constant

the total internal energy of the gas increases

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

How many balloons of 0.25 dm³capacity at I atmospheric pressure can be filled from a hydrogen gas cylinder of 5 dm³capacity at 10 atmospheric pressure

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50

90

180

200

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these

The Sl mechanism for the hydrolysis of an alkyl halide to an alcohol involves the formation of

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Carbocation

Carbanion

Pentavalent carbon in the transition state

Free radical

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

Enthalpy of neutralization of strong acids and strong bases have same values because

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Neutralization leads to the formation of salt and water

Acids always give rise to H+ and bases always furnish OH-

Strong acids and bases are ionic substances

The net change involves the combination of H and OH ions to form water