Question # 1

which one pair has the same oxidation state of-Fe?

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FeSO4 and FeCl4

FeCl4and FeCl3

FeSO4 and FeCl2

Fe2(SO4)3 and FeSO4

If there are weak intermolecular forces in a liquid, it will be

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more volatile

less volatile

more dense

less heavy

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

The collision which results in chemical reaction

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Effective collision

Ineffective collision

Useless collision

All of the above

The units of ionic product of H2O is

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Mole dm-3

Mole2 dm-6

Mole-1 dm-3

Mole-2 dm-6

The ratio of most probable velocity to that of average velocity is

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π/2

2/π

√π/2

The smallest unit of a crystal that shows all the characteristic properties of its pattern is called

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cell

electrolyte

unit cell

crystal

The emf produced by galvanic cell is called

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Cell potential

Oxidation potential

Redox potential

Reduction potential

Which of the following molecules have a permanent dipole

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CH₄

CHCl₃

CCl₄

CO₂

The product of pressure and volume remains constant when temperature and quantity of gas is:

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Zero

Variable

Kept constant

None of above

An element that is not an essential par of proteins is

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O

N

H

S

In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is

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1/3

1/5

2/3

5/6

A reaction A- B is independent of concentration of reactant A. The order of reaction will be

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First order

Second order

Third order

Zero order

Which of the following is not the application of plasma

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Fluorescent light bulb

Removal of hazardous chemical

Neon signs

Corrosion effective

In the esterification, first attack is due toon carborylic acid

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Hydrogen ion

Alcohols

Water

All

The forces present between the ions and water molecules are called:

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dipole-dipole forces

dipole-induced dipole forces

London dispersion forces

ion-dipole forces

The relationship between volume of a given amount of gas and prevailing conditions of temperature and pressure are:

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Charle's law

Graham's law

Boyle's law

Gas laws

Which of following factor affect vapour pressure of a liquid?

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temperature

inter molecules forces

size of the molecules

all of these

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

1, 3, 5-Pentanetriol has secondary carbon

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3

1

2

Zero

The process in which solid is directly coverted into gaseous state is called

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evaporation

boiling

sublimation

transformation

Water may boil at 120 °C when external pressure is:

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100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

Boiling point of H₂O is higher than that of HF although F is more electronegative than O. It is due to

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stronger dipole dipole forces in H₂O

H₂O is neutral HF is acidic

H₂O is angular, but HF is linear

number of hydrogen bonds more in H₂Othan in HF

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

For N2: +3H2<--------> 2NH3, if Kc is 1 than value of Kp at 273K would be

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1/22.414

1/(22.414)2

22.414

11.207

Stability of Cu-metal is due to filled of d-orbital

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Half

Completely

Partially

Quarterly

The particles in solids are

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widely separated and moving randomly

widely separated not moving

moving randomly but not separated

close together and vibrating slightly

Van der Waal's forces exist in

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Polar compounds

Non-polar

Covalent

All types of atoms and molecules

The graph between P onγ-axis and 1/V at x-axis for a given mass of a gas at temperature T is a

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straight line

curved upward

curved downward

circular

In which system hydrogen bonding is not present

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solution of ethanol in water

linking of helix in protein molecule

structure of ice

solution of NaCl in benzene

All of following acids have hydrogen bond in liquid state except:

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nitric acid

sulphuric acid

hydrochloric acid

hydrofluoric acid

Polarizability is responsible for intermolecular forces and it

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increases down the group

decreases down the group

almost remains the same

increased along a period

Which of the following molecules has angel of 120°

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BeCl2

BF3

CH4

NH3

Bonding in MgO is an example of

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lonic bond

Polar bond

Covalent bond

Coordination covalent bond

The value of general gas constant R is derived from:

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Newton's Cooling law

Maxwell's law

Avogadro's law

Charle's law

All the following have crystals except:

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potassium bromide

diamond

cadmium sulphide

sodium chloride

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

Which of the following successive ionization energies belong to a Group ll element?

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320,600,1110,1700,5650,

577,1820,2740,1160,14800,

428,3070,4600,5860,7990

736,1451,7740,10500,13600

When the concentration of product is increased the instantaneous rate of reaction with reference to reactants will be

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Positive

Negative

the same

falling curve

One molecule of gas is approximately Distance______ times its own diameter from its neighbour at room temperature.

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30

3000

3

300

The most suitable temperature for preparing ammonia gas is

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250℃

450℃

350℃

550℃

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

At constant temperature, volume of given mass of a gas is inversely proportional to pressure on it. This is statement of

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Charles law

Boyle's law

Hooks law

Grahams law

Which of the compounds cannot show positional isomerism?

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Alkanes

Alkenes

Alkynes

Alcohols

The deviation of a gas from ideal behaviour is maximum at

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-10°C and 5.0 atm

100°C and 2.0 atm

-10°C and 2.0 atm

0°C and 2.0 atm

The red brown ppt. of Fehling solution and benedict solution tests are of

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Ag

Cu2O

CuO

AgBr

Which one of the following is more acidic

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Phenol

Carboxylic acid

Alcohols

Amines

Which of the following molecules should be more volatile

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HF

HCl

HBr

HI

Which of the following element has high m.p and b.p, it acts as a reducing agent, and can react with bases?

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Sr

Ca

Be

Mg

SN2-reactions can be usually observed in

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Primary alkylı halide

secondary alkyl halide

Tertiary alkyl halide

Both A. and B

Which impurity makes the shape of NaCl crystal needle like

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MgSO4

urea

glucose

MgCO3

Diamond and silicon carbide are insoluble in all solvents because

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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

According to kinetic theory of gases there are

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Intermolecular attractions

Molecules which have considerable volume

No intermolecular forces of attraction

The velocity of molecules decreases for each collision.

When light is exposed to a typical transition element, then electrons jumps from low orbitals to higher orbitals in

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f-orbitals

s-orbitals

p-orbitals

d-orbitals

Low IE is a symbol of

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high electronegativity

small size

High electron affinity

Metallic character

Which molecule is least ionic"

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NaCI

HCL

HF

CsF

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

Acetic acid reacts with thionyl chloride to form acetyl chloride, which species acts as nucleophile in the reaction

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SO3

SO2

Cl-

No nucleophile is formed

Crystal lattice of the substances can be categorized into

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five types

seven types

six types

none of these

Which of the following tests helps to distinguish between alkyne and alkene?

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Lucas test

Tollen's reagent test

Baeyer's test

Fehling's solution test

Which is the incorrect value of gas constant R?

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2.987 cal k^-1 mol ^-1

3.313 Nmk^-1 mol^-1

62400dm³ atm k^-1 mol^-1

1.10821atm dm3k^-1 mol^-1