Question # 1

Which of the following is a thermosetting plastic?

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PVC

polyethylene

polystyrene

melamines

The fibre which is made from vinylidine chloride polymer is called

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rayon fibre

azlon fibre

acetate fibre

all of the above

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

Hydrogen has a = 0.245 atm. dm³. mole^-2and b = 0.0266 dm³. mole^-1SO₂gas has a = 6.170 atm. dm³mole^-2and b = 0.0564 dm³mole where a and b are Van der Waal's constant

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H₂gas deviates more from ideal behaviour tha SO₂

SO₂gas deviates more form ideal behaviour than H₂

both deviate from ideal behaviour equality

both are ideal gases

What will be the shape of a molecule which containstwo sigma bond pairs and one lone pair?

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Linear

V shape

Tetragonal

Triangular

Acetic acid is also named:

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Methanoic acid

Ethanoic acid

Propanoic acid

Butanoic acid

Which gas molecules escape through a hole of molecular dimension this phenomenon is called

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diffusion

mixing

effusion

flowing of gas

RNA is a polymer of a nucleotide which consist of three components. Which one is not the component in the nucleotide of an RNA

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D-Ribose

wracil base

prosphate group

thyamine base

In a crystal a ≠ b ≠ c,a = y 90° and β ≠ 90° it is

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Monoclinic

Rhombic

Trigonal

Tetragonal

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

Which of the following is a macronutrient?

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Boron

Iron

Copper

Carbon

Which property is not present in Al?

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Reacts with acid

Reacts with bases

Changes litmus paper

Changes methyle orange colour

If a reactant or product of a reaction absorbs radiation, then physical method for determining the rate of reaction is

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Spectrometry

Refractometry

Conductivity measurement

Optical method

When nitrogen is 5.6 grams in NO₂. then number of moles of NO₂is

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0.5

0.4

0.04

0.05

When a bond breaks

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Heat is evolved

Heat is absorbs

No change in heat contents takes place

Temperature increases

The formula of ketone is

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None of these

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

The order of distance between the various Bohr orbits is

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r₂- r₁> r₃- r₂> r₄- r₃> ......

r₁> r₂> r₂- r₃> r₄-r₃> .....

r₂-r₁= r₃- r₂= r₄- r₃> .....

r₂- r₁> r₃- r₂< r₄- r₃< ....

In ter-butyl alcohol, the tertiary carbon is bonded to

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Two hydrogen atoms

Three hydrogen atoms

One hydrogen atoms

No hydrogen atom

Alkenes normally have ______ geometry

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Tetrachedral

Linear

Planer

None

If the salt bridge is not used between two half cells, then the voltage

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Decrease rapidly

Decrease slowly

Does not change

Drops to zero

Ether shows the phenomenon of

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position isomerism

Chain isomerism

Metamerism

Cir-trans isomerism

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