Question # 1

Formula of stearic acid is:

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C₁₁H₂₃COOH

C₁₃H₂₇COOH

C₁₅H₃₁COOH

C₁₇H₃₅COOH

Acetic acid is obtained from:

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Red out

Vinegar

Butter

Milk

The ozone depletion in the stratophere is mainly due to the reaction of ozone with

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Freons

CFCs

Both A and B

None

The density of methane at 2.0 atmosphere pressure at 27°C is

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0.13 gL^-1

0.26 gL^-1

1.30 gL^-1

26.0 gL^-1

Most of high molecular mass polymers, used to make plastic rubbers or fibers have molecular masses between:

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1000-10000

1000-100000

10000-100000

10000-1000000

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

A molecule which contains two lone pairs and two bond pairs of electrons in valence shell of central atom, geometrical shape of molecules will be

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Tetrahedral

Trigonal pyramidal

Angular

Linear

At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with size of temperature due to

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increase in average molecular speed

increase in number of moles

increase in molecular attraction

decrease in the distance between the molecules

Which of the following human activities are contaminating surface and ground waters?

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pesticides

septic ranks

petroleum and natural gas production

all of these

Which of the following is a thermosetting plastic?

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PVC

polyethylene

polystyrene

melamines

The conversion of an halide of an alkene is an example:

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addition reaction

substitution reaction

elimination reaction

oxidation reaction

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1-bromobutane

2-bromobutane

1-bromo-2-methyl propane

2-bromo-2-methyl propane

For every reaction occurring in the body three is at least one type of

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Enzyme

Vitamin

Protein

Amino acid

Which functional group is present in glycerol tristearate

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Carboxylic acid

Alcohol

Aldehyde

Ester

When two hydrogen atoms approach to form a chemical bond

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The repulsive forces dominate the attractive forces

The attractive forces, dominate the repulsive forces

The energy of atoms increases

The two atoms start ionization

Objects of the size of an atom can be observed in

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An electron microscope

An x-ray spectrum

Atomic absorption spectrum

A visible spectrum

Phenol is used in the preparation of

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Bakelite

Phenatherene

Cellulose

All of these

Baukelite is a polymer obtained from two monomers

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Phenol and ethanol

Phenol and methanol

Phenol and methanal

Phenol and acetone

Detergents are

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Synthetic products

Natural products

Both (a) and (b)

None of these

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

Subsidiary quantum number specifies

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size of orbital

shape of orbital

orientations of orbitals

Nuclear stability

The elements of group lA are called

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Chalocogens

Halogens

Alkali metals

Alkaline earth metals

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