Question # 1

Asbestos is commonly used in making

Choose an answer

wall board

black board

soft board

hard board

H-bonding is maximum in:

Choose an answer

ethanol

benzene

diethyl ether

water

Amount of product formed increases with time, this statement is true for reactions-------with kinetics

Choose an answer

1s order

3rd order

zero order

Any order

Aluminium is in Group lll, its oxide will have the formula.

Choose an answer

AlO

AlO₂

Al₂O₃

Al₃O₂

An ideal gas expands according to PV=constant. On expansion, the temperature of gas

Choose an answer

will rise

will drop

cannot be determined because the exteral pressure is not known

will remain same

What is the weight of 10 dm³of CO₂at 27°C and 2 atm?

Choose an answer

89.3 g

56.1 g

125 g

127 g

The solubility of A2B3 is X mole dm-3. Its Ksp is?

Choose an answer

6X(5)

36X(5)

64X(5)

108X(5)

Ethylene polymerizes at 100 atm pressure and 400 °C to give

Choose an answer

Polybenzene

Polypropylene

Polyalcohol

Polyethylene

Identify the compound, which give iodoform test

Choose an answer

Methanol

3- Hexanol

Methyl ketone

Propionaldehyde

If the temperature is inereased of following reaction, then will go in N2 +3H2 <---------> .2NH3, ∆H= -Ve

Choose an answer

Forward direction

Reverse direction

Remain constant

Cannot be predicted

The partial pressure of 0₂in the lungus is

Choose an answer

116 torr

159 torr

560 torr

760 torr

NH₃can form only one hydrogen bond per molecule though it has three partially positively charged hydrogens

Choose an answer

nitrogen in NH₃has only one ions pair of electrons which can make one H-bond

ammonia is a base

ammonia is a weak acid

it ionizes to give one H⁺

The nature of crystals formed due to London forces of interaction are

Choose an answer

molecular

metallic

ionic

covalent

For a chemical reaction in which one of the reactant also act as solvent, the order will be

Choose an answer

First order

Third order

Second order

pseudo-first order

The structure of protein helps protein to

Choose an answer

be in proper shape

attach substrate

perform is function

All of these

The change in enthalpy when one mole of a substance is dissolved in a specified quantity of solvent at a given temperature is called

Choose an answer

Heat of reaction

Heat of solvation

Heat of combustion

Heat of solvent

In Boyle's law which of the following pair is variable:

Choose an answer

Temperature and quantity of a gas.

Pressure and volume.

Volume and quantity of a gas.

Pressure and quantity of a gas.

For a chemical reaction which can never be a fractional no

Choose an answer

order

molecularity

half-life

rate constant

Absolute zero, the lowest temperature on kelvin scale lies at

Choose an answer

-273°C

273°

-100°C

100°C

Which of the following contains maximum of number of molecules?

Choose an answer

100 cc of CO₂ at STP

150 cc of N₂at STP

50 cc of SO₂ at STP

200 cc of NH₃ at STP

Bonding in MgO is an example of

Choose an answer

lonic bond

Polar bond

Covalent bond

Coordination covalent bond

Which of the following has isomorphous structure with MgO

Choose an answer

NaF

S

Sn

N

Which value is designated as absolute zero or zero of the Kelvin scale?

Choose an answer

-273.15°C

-173.15°C

273°C

none of these

Which of the following liquid has highest bolling point

Choose an answer

HCI

HBr

H2O

Br2

The surface formed by the breakage of a crystal is called _____ plane

Choose an answer

Crystal

Unit

Cleavage

None

Enthalpy of formation of one mole of ionic compound form gaseous ion under standard condition is called

Choose an answer

Gibb's energy

Bond energy

Lattice energy

Which is not mineral of AI?

Choose an answer

Diaspore

Corrundam

Bauxite

Galena

Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water

Choose an answer

4x6.022x10ê23

1×6.022x10ê23

2x6.022 x10ê23

2x6.022x10ê22

In a closed vessel a gas is heated from 300 K to 600K The kinetic energy becomes remains

Choose an answer

Double

Same

Half

Four times

Benzene cannot undergo the ------- directly

Choose an answer

Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

Which compound is not formed as a result of reaction between acetic acid & HI & red phosphorous

Choose an answer

Ethanol

Water

lodine

Ethane

Phenol is colourless, crystalline and solid

Choose an answer

Hygroscopie

Deliquescent

Moistening

Odourless

The gas which obeys the gas laws at all conditions of temperature and pressure is

Choose an answer

ideal gas

perfect gas

real gas

noble gas

Helical structure of proteins is stabilized by

Choose an answer

Peptide bond

Dipeptide bond

Van der Wall's forces

Hydrogen bonding

Which one of the following doesn't exhibit allotropy?

Choose an answer

Bi

As

N

P

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

Choose an answer

Aldehyde

Alkene

Aldehyde and ketone equally

Neither aldehyde nor alkenes

What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature)

Choose an answer

constant P and T

constant P and V

constant T and V

constant n and v

The amount of heat absorbed when one mole of a liquid is changed into vapours at its boiling point is called

Choose an answer

Heat of sublimation

Heat of vaporization

Heat of fusion

Enthalpy change

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:

Choose an answer

H20 at room temperature

KOH in alcohol

Ethanol. heat

Dilute NaOH(aq) warm

The volume of gas depends upon the------- moleules

Choose an answer

Size of

Space between

Molecular weight

both a and b

About 25% of earth crust mass is made up of element

Choose an answer

Oxygen

Silicon

Aluminium

Aluminates

Diamond and silicon carbide are insoluble in all solvents because

Choose an answer

they have high melting and boiling points

absence of three electrons

they are huge giant three dimensional molecules (macromolecules)

their unit cells have tetrahedral geometry

Mostly ionic compounds are produced between elements of group

Choose an answer

IA and IIA

IB and VIB

IA. IIA and VII-A

IA and IB

For reaction of methane and chlorine light is not available then

Choose an answer

Reaction will take place rapidly

No Reaction take place

Reaction occurs at double the rate

May all cases occur

Hydrogen bonding is involved in

Choose an answer

Solubility

Detergents

Biological molecules

All the above

Which one increases by common ion effect except?

Choose an answer

Crystallization

Solubility

Association of ions

All of these

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

Choose an answer

,4 g

, 0.4 g

, 10 g

, 2 g

Atoms having same mass number but different atomic numbers are called.

Choose an answer

Isotopes

isobars

Isotones

isomers

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

Choose an answer

a straight line

a curve with different peaks

straight line parallel to x-axis

a curve called isotherm

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

Choose an answer

Is changed by about 26%

Is halved

Is unchanged

Change by 33%

Ice floats on water because

Choose an answer

the hydrogen bonding in ice is stronger than that of in water

empty spaces are left in ice

ice has two-dimensional structure

the bond length of the oxygen and hydrogen bond is different in water and ice

When stress is applied to the metals, the metals are malleable and ductile because

Choose an answer

their layers slip pass each other

atoms lose electrons

mobility of electrons increased

none of the above

At freezing point of water, the density decreases due to

Choose an answer

change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

One Pascal is equal to

Choose an answer

1 Nm^-2

1 Nm

1 Nm^-1

1 Nm²

The value of oxidation number of chlorine in HCIOs is

Choose an answer

+7

+5

-1

+3

What s the boling point of H2O at the peak of Mount Everest?

Choose an answer

101 C°

69°C

100 C°

98° C

The Cl- ion present at the corner of the unit cell is NaCl crystal, contributes

Choose an answer

1/8 th

1/4 th

1/2 th

1

The Kw. of water at 25 C° is given by

Choose an answer

10(-7)

10(-10)

10(-12)

10(-14)

Which of the following molecules has angel of 120°

Choose an answer

BeCl2

BF3

CH4

NH3

What types of bonds are broken when water turns into steam on heating?

Choose an answer

covalent

permanent dipole interactions

hydrogen bonds

induced dipole interactions

Substance that does not show the process of sublimation is

Choose an answer

K2Cr2O7

iodine

naphthalene

NH4CI