Question # 1

Lithum silicide reacts with concentrated hydrochlric acid to give lithium chlride along with.

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H2 and SI

Si H 4 gas

Disilane gas

Si3H8

HCIO2 gives the structure of a.

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Linear

Angular

trigonal pyramidal

Tetra hddral

Which of the following gas does not exist free on earth.

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N2

H2

O2

CH4

Example of intra molecular hydrogen bonding.

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O-nitrophenol

O-hydroxy benzaldehyde

O- hydroxy benzoic acid

All of the above

How many unpaired electron are there in a strong field iron (II) octahederal compled.

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0

1

2

4

Equilibrium constant Kp and Kc are related as

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Kc = Kp (RT)delta n

Kp = Kc (RT)an

Kp = (Kc/RT)delta n

Kp -Kc = (RT)delta n

Which of the following pair on aldol condensation followed by dehydration gives methyl vinyl ketone.

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HCHO and CH3COCH3

HCHO and CH3CHO

CH3CHO and CH3CHO

CH3COCH3 and CH3COCH3

Hybridization involves.

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Orbitals of same atom with slightly different energies.

Orbitals of different atoms, but with equal energies.

Orbitals of the same atom but with widely different energies.

Orbitals of different atoms with different energies.

The hybridization of S in SO2 is.

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sp

sp2

sp3

dsp2

Which of the following anionic species is not separated by gravimetric analysis.

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Cl-

SO4

CH3COO-

PO4

Which of the following is class of nanorods

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metals

alloys

Metal oxide and Metal sulphite

All of the above

The ion that is isoelectornic with CO is

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CN-

O2+

CO2-

N2+

The IUPAC name of HOCCH2CH2CH2COOH is

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4- formylbutanoic acid

5- formylpentanoic acid

4- carboxybutanal

5- carboxypentanal

What of the following is not a Lewis base.

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CN-

AlCl3

NH3

ROH

Which of the following is not a characteristic of covalent compound.

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They have low melting and boiling points.

They ionize on dissolution in polar solvents

Their molecules have definite geometry

They are generally insoluble in water

Pig iron is also called.

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Cast iron

Steel

Wrought iron

Stainless steel

In Pakistan the total production of glass is over ________ tons per year.

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800

8000

80,000

None of these

Which of the following statement about molecularity is not correct.

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It cannot be fraction

It can be obtained from balanced equation

It may be or may not be equal to the order of the reaction

it can not be more than 3

Formula of orthophosphoric acid

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H2PO4

H3PO2

H2P2O5

The half life period of any first order reaction.

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Is half the specific rate constant

Is independent of the initial concentration

Is always the same whatever the reaction

Is directly proportional to the initial concentration of the reactant

Which of the following compounds has highest dipole moment.

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Dichloromethane

Chloroform

Chloromathane

All above

Pauling has suggested that the calculate of energy can be improved by considering.

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Screening effect

Polarization effect

Both A and B

None of abvoe

Which of the following compounds shows optical activity

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Lactic acid

Maltose

Glucose

All above

Which of the following is not a property of aluminium.

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An efficient electrical conductor

A low density compared to other metals

Is amphoteric

Toxic to humans

Enzymes are

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Complex non living compunds

Laving organisms

Complex protein molecules

Bacterial colonies

Sterols are steroids having the functional gruup.

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Ketonic

Al;coholic

Phenolic

Aldehydic

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

The overall energy change during the Cannot cycle to.

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Equal to zero

Equal to Q

Equal to W

Maximum

The addition HCl to 2-pentene give

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3-Chloropentane

2- Chloropentyne

2- Chloropentane

2-Chloro-2-methyl butane

Identify an oxygenated cyclic terpenoid

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a- pinene

Camphor

Citral

Geranial

Which of the following statements is correct.

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A sigma bond is weaker than a pi pond

There are four coordinate bonds in the Lewis structure of NH4+ ion.

The 1 covalent bond is directional in nature

A single bond between the two atoms cannot be re bond.

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