Chemistry/Chemistry MCQ Question - Basic Concept Sample Test,Sample questions

Question:
1 a.m.u =

1.1.6 x 10-27 kg

2.1.6 x 10-24 kg

3.1.6 x 10-26 kg

4.1.6 x 10-28 kg


Question:
A malleable solid is one which can be

1.Converted into wires

2.Converted into thin sheets

3.Melted easily

4.All of the above


Question:
A solid may be made up of

1.Atoms

2.Ions

3.Molecules

4.a b and c


Question:
Actually the vapour pressure on the surface of liquid in the flask is equal to

1.? h

2.Pa - ?h

3.Pa + ?h

4.Pt = Pa - ?h


Question:
Amorphous substances posses

1.No definite geometry

2.No definite heat of fusion

3.No sharp melting points

4.All of the above


Question:
Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to

1.More strength of H-bonding

2.More strength of London forces

3.Less polarizability

4.All of the above


Question:
Combustion analysis is performed to determine

1.Empirical formula

2.Molecular mass

3.Molecular formula

4.Formula mass


Question:
Crystalline solids can be identified easily from their

1.Sharp melting point

2.Definite geometry

3.Transition temperature

4.Colour


Question:
Crystallites are present in

1.crystalline solids

2.amorphous solids

3.liquid crystals

4.all of the above


Question:
Dempsters mass spectrometer has number of zones / parts

1.5

2.4

3.3

4.2


Question:
During which process empty spaces between particles become minimum?

1.ionization

2.condensation

3.fusion

4.evaporation


Question:
For which of the following compounds the term empirical formula cannot be applied?

1.NaCl

2.H2O

3.CCI4

4.It can be applied to all mentioned above


Question:
Forces of attraction which may be present between all kinds of atoms and molecules are

1.intramolecular

2.intermolecular

3.van der Waal

4.Dipole-induced dipole


Question:
Formation of vapours from the surface of a liquid is called

1.vapourization

2.evaporation

3.condensation

4.cracking


Question:
Hydrogen bonding is involved in

1.Solubility

2.Cleansing action of detergents

3.Biological molecules

4.All


Question:
If we provide very high amount of heat to a liquid its boiling point will

1.increase

2.remains constant

3.decrease

4.there will be no boiling


Question:
In order to mention the boiling point of water at 110?C the external pressure should be

1.Between 760 torr and 1200 torr

2.Between 200 torr and 760 torr

3.765 torr

4.any value of pressure


Question:
Isotopes differ in

1.properties which depend upon mass

2.arrangement of electrons in orbitals

3.chemical properties

4.all of the above


Question:
Isotopes of the same elements has

1.different number of protons

2.same number of neutrons

3.different number of neutrons

4.same mass number (nucleon number)


Question:
Liquid crystal is discovered by

1.William Crooks

2.Fredrack Reinitzer

3.J.J Thomson

4.Bravis


Question:
Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it?

1.Liquid do not have definite shape

2.Liquid do not have definite volume

3.Lieuid is highly compressible

4.Liquid molecules can slide over each other


Question:
Molar heat of vaporization of water is

1.40.7 KJ/mole

2.40.7 J/mole

3.40.7 cal/mole

4.40.7 Kcal/mole


Question:
Mostly elements have fractional atomic masses because of

1.mass of an atom itself is in fraction

2.atomic masses are average masses of isobars

3.atmoic masses are average masses of isotopes proportional to their relative abundance

4.atmoic masses are average masses of isotopes


Question:
Rising of a wetting liquid in a capillary tube is due to

1.Surface tension

2.Cohesive forces

3.Adhesive forces

4.viscosity


Question:
Steam causes more sever burn than the boiling water because it possesses.

1.Latent heat of fusion

2.Latent heat of vaporization

3.Latent heat of sublimation

4.All of the above


Question:
Table salt crystallizes with a

1.Face centered cubic lattice

2.body centered cubic lattice

3.simple cubic lattice

4.othorhombic lattice


Question:
The boiling point increases down the zero group element due to

1.Ion dipole forces

2.London forces

3.Hydrogen bonding

4.Dipole dipole forces


Question:
The conversion of vapours back into their liquid state is called

1.crystallization

2.evaporization

3.vaporization

4.condensation


Question:
The density of water may be

1.Equal to that of ice

2.Greater than that of ice

3.Less than that of ice

4.All are possible


Question:
The nucleus of an atom of every element will always contain

1.neutrons

2.protons and electrons

3.protons

4.protons and neutrons


Question:
The number of formula units in 29.25g of common salt

1.6.022 x 1023

2.3.01 x 1023

3.2 x NA

4.4 x 6.022 x 1023


Question:
The properties of an element mosly corresponds to that isotope which has greater

1.Mass number

2.Atomic mass

3.Relative abundance

4.all of the above


Question:
The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of

1.vaporization

2.evaporation

3.crystallization

4.sublimation


Question:
The ttractive forces between the partial positive end of one molecule and partial negative end of other molecule are called

1.Dipole-dipole forces

2.Ion dipole-dipole forces

3.London dispersion forces

4.Debye forces


Question:
Vapour pressure is not affected by

1.Surface area

2.temperature

3.intermolecular forces

4.atmospheric pressure


Question:
Vapour pressure of water at 100?C is

1.55 mm Hg

2.760 mm Hg

3.355 mm Hg

4.1489 mm Hg


Question:
Water has maximum density at

1.0?C

2.2?C

3.4?C

4.100?C


Question:
When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether?

1.0.5

2.1

3.1.5

4.2


Question:
When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen

1.lighter

2.intermediate

3.heavier

4.are collected at same time


Question:
When substance moves from a solid to a liquid state all of the following changes occur except

1.Molecules become more disordered

2.K.E of the molecules decreases

3.Intermolecular forces become weaker

4.Molecule become further separated


Question:
When the atoms of third layer are arranged in such a way that they directly lie above the atoms of first layer then this arrangement is called

1.ABAB (hexagonal)

2.ABCABC (Cubic)

3.Orthor hombic

4.Rhombohedral


Question:
When water freezes at 0?C its density decreases due to

1.Change of bond angles

2.Cubic structure of ice

3.Empty space present in the structure of ice

4.Change of bond length


Question:
Which has strongest bonding in the solid state?

1.Hydrogen Chloride (HCI)

2.Chlorine (Cl2)

3.Xenon(Xe)

4.Sodium Chloride (NaCI)


Question:
Which of the following has strongest intermolecular forces of attraction?

1.Hydrogen (H2)

2.Chlorine (Cl2)

3.lodine (I2)

4.Methane (CH4)


Question:
Which of the following is not a macromolecule?

1.sand

2.haemoglobin

3.diamond

4.maltose


Question:
Which of the following methods is used to estimate hydrogen in an organic compound?

1.Combustion method

2.Dumas method

3.Kjeldahls method

4.All of the above methods are for different purposes


Question:
Which one is a conductor but is not malleable?

1.Iron

2.Graphite

3.Silver

4.Platinum


Question:
Which one is false for evaporation?

1.Surface phenomenon

2.Continuous

3.Exothermic

4.Cause cooling


Question:
Which one of the following does not show hydrogen bonding ?

1.Water

2.Ethyl alcohol

3.Phenol

4.Diethyl ether


Question:
Which one of the following has highest volatility

1.Diethyl ether

2.Ethyl alcohol

3.Water

4.Ethylene glycol


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