Question # 1

The following alloys are the chief alloys that are die cast except.

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Zinc alloys

Magnesium alloys

Manganese alloys

Nickel alloys

Chlorofluorocarbon are widely used as coolants in.

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Air conditioners

Clearing solvents

Aerosol propellant's

All above

Fish die in water bodies polluted by sewage due to.

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Pathogens

Clogging of gills by silt

Reduction in dissolved oxygen

Foul smell

Greeks and Romans had used nanoparticles in the manufacture of.

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Cosmetics for eyes

Medicines

Metals

Hair -dye

Which of the following is an important aspect of industrial ecology.

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Minimising air emissions

Minimising liquid waste

Recycling after use

All above

In the process of electrosmosis

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Colloidial particles move towards the electrodes

Both colloidal particles and dis persons medium move

Only dispersion medium moves to carry the current

Positively charged colloidal particles move, but negatively charged particles remain stationary

Which of the following pairs does not represent Lowery acid base pair.

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H2O+NH3

H2O +H2O

HCL + H2O

CH3NH2 + BF3

What is the colour of pulp obtained from chemical pulping.

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Black

Brown

Blue

Red

Which one of the following does not exhibit paramegnetion.

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NO

NO2

CiO2

CIO-2

Equivalent conductance is expressed in the units.

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S cm-1 eq -1

S cm eq-1

S cm2 eq-1

S cm2 eq

Which of the following statement is not true is case of catalytic reforming.

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Dehydrogenations high endothermic

Dehydrogenation is exothermic

Hydrodealkylation reactions are endothermic

None of these

The vitamin which is related to monossaccharides is.

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Vitamin A

Vitamin C

Vitamin D

Vitamin E

Which of the following is not an alum.

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KAI (SO4)3 12 H2O

NaAI (SO4)2 12 H2O

NH4Fe (SO4)2 12H2O

FeAl (SO4)2 . 12 H2O

Perdisulphuric acid is.

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Marshal acid

Caro acid

None of above

Any of above

When two bodies have equality of temperature with a 3rd body they in turn have equality of temperature with each other. This is a statement of.

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First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Colour in transition metal compounds in attributed to

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Small sized metal ions

Absorption of light in UV region

Complete ns sub shell

incomplete (n-1) sub shell

Which of the following molecules have centre of symmetry.

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H2O

HCl

CO2

H2SO4

Which of the following is the statement of third law of thermodynamics.

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Entroy of perfectly crystalline substance is zero at T = 0

Entropy of a perfectly crystaline substance is zero at standard state conditions

Entropy and enthalpy of a substance become equal at T = 0

Free energy of a crystalline substance is zero at T = 0

Chromium is found in nature in the the form of.

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Oxides

Silicates

Borates

Sulphides

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

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800

8000

80,000

None of these

The substance that can form the glassy non-crystalline structure is called.

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Stabilizers

Fluxes or modifiers

Formers

None of these

Molecules have zero dipole moment

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CO2

BCl3

CH4 & CCl4

All above

Process of separating the racemic mixture into optically active isomers is known as.

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Resolution

Racemisation

Walden inversion

Epimerization

Which of the following is branch chain polymer.

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Glycogen

Terylene

PVC

Orlen

Which of the following statement is false about resonance.

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It increase the stability of a molecule

It leads to similar type of bonds

It increase the reactivity of the molecule

It decrease the reactivity of the molecule.

The emission of light in a biological reaction in known as.

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Fluorencence

Phosphoreacence

Biolumineacence

Phtolysis

An element having low IE and low EA is likely to belong to.

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Group IA

Group IB

Group VII A

Group VIII

Glycine reacts with nitrous acid to form

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Methyl amino

Acetic acid

Zwitter ion

Glycollic acid

When borax is strongly hented, it gives

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B2O4

Na2B4O7

NaBO2

NaBO2 + B2O3

The exchange equilibrium in gas chromatography depends on.

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Solubility or absorbability of he sample

The polarity of he stationary phase and analyte

The degree of H bonding

All above factors

Used in Geiger counter to detect radioactivity

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He

Ne

Ar

Kr

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