Question # 1

Plastics are amorphous solids and

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have sharp melting points

undergo clean cleavage when cut with knife

do not undergo clean cleavage

possess orderly arrangement over long distances

Mercury does not wet the glass because of

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repulsion

weak cohesive force

high viscosity

capillary action

It is very much difficult to cook food at Mount Everest, because

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temperature of atmosphere is very low

the boiling point of water is 69°C

water becomes heavier

the boiling point of water is increased

The relative rate of diffusion of a gas (molecular weight = 128) as compared to oxygen is

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2 times

1/4

1/8

1/2

H₂O is liquid at room temperature whereas H₂S is a gas because

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H₂O used as drinking water, but H₂S has rotten egg smell

H₂O is neutral. H₂S is a weak acid

stronger hydrogen bonding in H₂O than in H₂S

H₂O occurs abundantly than H₂S

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

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12

8

6

10

According to Boyle's law, which parameters give a straight line parallel to x-axis, when we plot a graph between:

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V and T

P and V

P and 1/V

P and PV

If a salt bridge is removed from two half cells the emf is

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Increased

Decreased

Dropped to zero

Electrodes will be reversed

The solubility product is only applicable for those substance whose molar concentrations is

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0.01

Equal to 1

Less than 0.01

Greater than 10

Which of the following molecules have a permanent dipole

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CH₄

CHCl₃

CCl₄

CO₂

Which of the following reactants will be required to form ethene from ethyl chloride

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_{Alcoholic KOH}

Alkaline KMnO4

Aqucous KOH

Aqucous NaOH

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

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

Which of the following is the simplest form of matter?

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Gaseous state

Liquid state

Solid state

All of above

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

How many secondary carbon atoms are present in Methylcylopropand

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1

2

3

0

A teacher told his student that air is a mixture. This is due to the reason that suddenly a student raised his hand and said:

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it has different properties from its constituents

oxygen can be removed from it

it is colourless

its composition is different at different altitudes.

In a crystal the atoms are locate at the position of:

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infinite potential energy

minimum potential energy

Zero potential energy

maximum potential

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

Which of the following elements is most metallic

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Bi

sb

As

P

Oxygen and sulphur are present in VI-A group of the periodic table The hydride of oxygen i.e., H2O is liquid at room temperature but the hydride of sulphur (H2S) is a gas. This is due to

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greater bond angle of water than Hs

greater bond lengths in HS than H2O

hydrogen bonding in water

acidic character of HS

In Boyle's law which of the following pair remains constant:

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Temperature and quality of a gas.

Pressure and quality of a gas.

Temperature and pressure.

Temperature and quantity of a gas.

London forces are

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stronger than dipole-dipole interactions

weaker than dipole-dipole interactions

equal to dipole-dipole interactions

sometimes stronger and sometimes weaker than dipole-dipole interactions

An alkyl halide reacts with NH3 to give

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Amide

Cyanide

Amine

Aniline

The compressibility factor of an ideal gas is

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0

1

2

4

Molecular ions are produced in mass spectrometer. Which type of molecular ion formed more abundantly.

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Negatively charged

H⁺ ions

Positively charged

equal positive and negative ions

The reaction of formaldehyde with HCN is

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Nucleophilic substitution

Electrophilic substitution

Nucleophilic addition

Free radical addition

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 element with highest E°red

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N

F

O

CI

Which impurity makes the shape of NaCl crystal needle like

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MgSO4

urea

glucose

MgCO3

A gas has non-ideal behaviour at:

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high temperature and high pressure

low temperature and low pressure

high temperature and low pressure

low temperature and low pressure

The total pressure exerted by a mixture of gases is the sum of the partial pressure of all the gases present is a statement of

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Charle's Law

Boyle's Law

Dalton's Law

Graham's Law

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

In which of the following Equilibria will Kc and Kp have not the same value

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2HI <--------> H2+I2

2SO2 + O2 <--------> 2SO3

N2 + O2 <---------> 2NO

All of these

Air at sea level is dense.This is a practical application of

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Boyle's law

Charle's law

Avogadro's law

Dalton's law

The largest number of molecules are present in

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

Which of the following is an example of diffusion?

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Spreading of smell of flowers in garden

Steam condensing on a cold window

Bubbles rising in a beaker of boiling water

All of above

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

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

What is the pressure of 2 mole of NH₃ at 27°C when its volume is 5 lit.in Van der Waals equation?(a = 0,17,b = 0.03711)

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10.33 atm

9.333 atm

9.74 atm

9.2 atm

what is the exact value of angle in BF3

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90

104.51

119.5

120°

Which of the following equations represents the 2nd ionization energy of Na?

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Na(g) ---> Na²⁺ (g) + 2e^-

Na(s) ---> Na²⁺ (g) + 2e^-

Na⁺(s) ---> Na²⁺ (g) + e^-

Na⁺(g) ---> Na²⁺ (g) + e^-

The collision which results in chemical reaction

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Effective collision

Ineffective collision

Useless collision

All of the above

Which of the following statements about amorphous solids is incorrect?

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They melt over a range of temperature

They are anisotropic

There is no orderly arrangement of particles

They are rigid and icompressible

Active sulphonating agent during sulphonation of benzene is

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SO2

SO3

SO3H

SO3+

Which of the following is the correct equation to calculate relative molecular mass of a gas

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M=mPRTV

M=mPR/VT

M=PV/mRT

M=mRT/PV

The bonding which occurs among polar covalent molecules containing H and one of the small electronegative element such as O, F or N is called

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bridge bonding

metallic bonding

hydrogen bonding

Ionic bonding

Which type of motion is exhibited by gases?

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Vibrational

Transitional

Rotational

All of them

H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to:

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water is more polar than HF

water has a bent structure

HF has a zig zag structure after making hydrogen bonding

the number of hydrogen bonds produced by water are greater than that of HF

All the following statements are incorrect except:

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all of the gases cannot be liquefied

increase of pressure will not decrease the inter molecular distance in a gas

gas molecules do not attract each other at very low temperature

actual volume of a gas is not negligible at very pressure

Ethene can give all of the following reactions except

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Addition

Free radical substitution

Hydrohalogenation

Hydration

The distribution of energies among the molecules of gases was studied by:

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Maxwell

Coulomb

Newton

Boltzmann

For which mechanisms, the first step involved is the same

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E1 and E2

E2 and SN2

E2 and E1

E1 and SN1

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

Which of the following laws study the pressure-volume relationship of a gas at constant temperature,we get

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a straight line

a curve with different peaks

straight line parallel to x-axis

a curve called isotherm

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

Gases are effused through a whole due to ______ motion

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Vibration

Rotaional

Translational

Chaotic

Which of the following gives positive haloform test and positive Fehling solution

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Acetone

Echanol

Acetaldehyde

Formaldehyde

What is the numerical value of 'R; (the gas constant) in S.I units?

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83143 J/mole/K

Avogadro's law

83.143 J/mole/K

8.3143 J/mole/K

In a period the atomic radii

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increase

decrease

remain same

first increase, then decreased