Question # 1

When chlorofluoro carbon are subjected to U.V they form

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Cations

Aninons

Free radicals

None of these

The unit of pressure ______ is commonly used by meteorologists

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mm of Hg

Kilopascal

Millibar

Pound per square inch

Energy of atom in compound is

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Higher than individual atom

Lower than individual atom

equal to individual atom

Impossible to predict

Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?

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Both undergo chemical change when they conduct

Both conduct by the movement of charge particles

Both will also conduct in the solid state

Both contain mobile electrons

Polyesters resins have special use in:

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Clothing

Paints

Emulsion

Floor covering

Which of the following is not a carbohydrate?

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nuclic acid

strach

glycoyen

cellulose

Corrundam is ore of which element?

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Al

Th

In

Mg

Bonding in MgO is an example of

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lonic bond

Polar bond

Covalent bond

Coordination covalent bond

All the metal shine when they are freshly cut The reason is

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the conductivity of the metal is increased

the process of cutting gives energy to the metal atoms

the electrons become less delocalized according to valance bond theory

the electrons are excited at higher energy levels and emit the photons when they fall back

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

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ideal gas

perfect gas

real gas

noble gas

Nucleic acid contain elements like N,H,O,C and

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Ca

S

P

F

Eka-aluminium and Eka-silicon are known as

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Gallium and Germanium

Aluminium and silicon

Iron and sulphur

Proton and silicon

The method used only for the production of symmetrical alkanes

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Kolb's method

Clemmenen

Cannizzaro

Wolf kishner

Solution may have units

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Molarity

Molality

Mole fraction

All of them

The value of SHE is cathode and anode is always taken to be

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One

Zero

Different

Same

A solution containing maximum amount of solute dissolved at a given temperature is called

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Saturated solution

Unsaturated solution

Supersaturated solution

Impure solution

Oxidation of ter-alcohol gives:

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Aldehyde

Formaldehyde

Ketone

Alkens

Copper oxide is dedected by borax bead test with colour:

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Blue

Red

Yellow

Black

Which of the following has highest dipole moment?

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NH₃

PH₃

AsH₃

SbH₃

Mass spectrometer measures the

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Exact mass of an element

Average mass of an element

The number of elements present in a molecule

m/e value of a positive ion

Carboxylic acids are more acidic than pehnol and alcohol because of

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Intermolecular hydrogen bonding

Formation of dimmers

Highly acidic hydrogen

Resonance stabilization of their conjugate base

Which one of the following has no units of its K_cvalue

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