Question # 1

Newspapers can be recycled again and again by how many times

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5

2

4

3

Which of the following are thermoplastic materials?

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PVC

polystyrenes

polyethylene

all these

Proteins are classifies into ______ classes based on physic-chemical properties

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2

3

5

9

Which type of motion is exhibited by gases?

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Vibrational

Transitional

Rotational

All of them

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

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Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

Which pair of molecules have debye force

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Ne and Ne

Argon and water

Na⁺ion and water

Water and water

One of the following is potically non active amino acid

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Valine

Tyrosine

Glycine

Theronine

Why is carbon monoxide called as pollutant? The reason is that

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It combines with oxygen

It combines with haemoglobin

It inactivates glycolysis

It inactivates nerves

Which of these polymers is a synthetic polymer?

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Animal fat

Starch

Cellulose

Polyester

Which of the following may be called London dispersion forces

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dipole-dipole forces

ion-dipole forces

dipole-induced dipole forces

instantaneous dipole-induced dipole forces

In an elimination reaction a more substituted alkene is formed due to the stability associated with

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Free radical

transition state

Activated complex

Carbocation

When the solute is present in trace quantities the following expression is used

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Gram per million

Milligram percent

Microgram percent

Parts per million

The reaction of aromatic acyl chloride and phenol in the presence of a base NaOH or pyridine is called

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Kolbe's reaction

Perkin's reaction

Sandmeyer's reaction

Schotten Baumann reaction

There are 20 amino acids found in protein which is not the property of these amino acids

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They are allα-amino acids

They are all optically active

They have high decomposition point

They are water soluble

In fructose the possible optical isomers are

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12

8

16

4

In the presence of Aluminium ethoxide, aldehydes get converted into esters. The reaction is known as

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Schmidt reaction

Aldol condensation

Beckmann's rearrangement reaction

Tischenko reaction

An artificial smell of banana is produced in many articles y using esters which of the following is that

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Amyl acetate

Isoamyl valerate

Octyl acetate

Methyl butyrate

Silicon atom is hybridized:

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sp

sp²

sp³

dsp²

Which of the following pair of atomic numbers represents s-block elements?

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7, 15

6, 12

9, 17

3, 20

The oxides of which of the following elements will be acidic in character

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Mg

Rb

Li

Cl

Which of the following synthetic fertilizer do not make soil acidic

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Urea

Thin urea

Ammonium phosphate

Potassium nitrate

Which of the following statement is correct for a chemical reaction to occur molecules of substances must

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Collide with each other

Collide with energy more than activation energy

Collide with energy less than activation energy

Collide with high frequency

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