Question # 1

Ethylene combines with water in the presence of H₂SO₄+ HgSO₄and forms

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Ethyle chloride

Ethyle alcohol

Carboxylic acid

None of these

Isotopes of an element differ in

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Number of protons

Number of electrons

Number of neutrons

Number of electrons and protons

How is the secondary structure of protein stabilized

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Through hydrogen bonding

Through ionic bonding

Through van der wall forces

Through covalent bonding

From ₃₉Y to ₄₈Cd are called

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Transition elements

Outer transition elements

Inner transition elements

2nd transition series

The color of ppts formed by Benedirct's test is

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Brick red

Wine red

Yellow

Orange

Reaction of Grignard's reagent with formaldehyde gives:

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pri-alcohol

sec-alcohol

ter-alcohol

carboxylic

For a 3P subshell the set of principle and azimuthal quantum number is

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n = 1 , l = 2

n = 3, l = 0

n = 3, l = 1

n = 1, l = 3

SO₂and NO₂produce pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

Hydrogenation of vegetable oils is accelerated by Ni catalyst. The catalytic activity of Bi is increased by a promoter of activator which is

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Na and K

Na and Hg

Hg and Zn

Cu and Te

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Initial concentration of acetic acid

Initial concentration of ethyl acetate

Equilibrium concentration of acetic acid

Equilibrium concentration of ethyl acetate

N₂O₄⇌ 2NO₂

For the above reaction, which of the Following expression of K_c correct :

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Kc = [ N₂O₄]/[ NO₂]²

Kc = [ N₂O₄]/ [NO₂]

Kc = [ N₂O]²/[ N₂O₄]

Kc = [ N₂O₄]/[ N O₂]

What is going to replace the petroleum?

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Silica

Silicates

Silicones

Silicon

Which is a reagent for Lucas test

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ZnCl₂+ Conc. HCl

Zn

Na

Br

Which of the following is not charged particle

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Proton

Electron

Neutron

Hydrogen nucleus

Solubility of KMnO₄at higher temperature is:

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5%

7%

15%

25%

Relative atomic mass of an element is the mass of the element relative to

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1/12 mass of carbon-12

1/12 mass of carbon

1 mass of hydrogen atom

1/16 mass of oxygen

What are alloys

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A homogenous mixture of two or more elements

A homohenous mixture of metal and a non-metal

A homogenous mixture of two or more metals

None of the above

Electron affinity of sulphur is

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More than O and Se

More than O but less than Se

Less than O but more than Se

Equal to O and Se

Which of the following is lighter

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Li

k

Na

Ca

The number of paper industries in Pakistan are

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30

25

35

20

Organic compounds generally react at ______ rates

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Slow

Fast

Moderate

None of them

The Mn³⁺has ______ color

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Violet

Green

Red/brown

No color

Ionic radius, in a period from left to right

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Increases

Decreases

Decreases then increases

Increases and decreases

Active metals react with carboxylic acid releasing gas:

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CO

CO₂

H₂O as steam

H₂

Which isomer of C₅H₁₁OH gives, one dehydration, the greastest number of different alkenes

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Acetic acid is manufactured by:

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Distillation

Fermentation

Ozonolysis

Esterification

A solution of NaOH has pH = 13, then concentration of NaOH is

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10^-13M

10¹³M

10^-1M

10⁺¹M

Teflon, styron and neoprene are all

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Copolymers

Condensation polymers

Homopolymers

Monomers

The largest number of molecules are present in

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3.6 g of H₂O

4.8 g of C₂H₅OH

2.8 g of CO

5.4 g of N₂O₅

The experimental relationship between a reaction rate and the concentration of reactants is known as

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Order

Molecularity

Rate constant

Rate law

Protein may have

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Primary structure

Secondary structure

Tertiary structure

All of these

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