Question # 1

In which system hydrogen bonding is not present

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solution of ethanol in water

linking of helix in protein molecule

structure of ice

solution of NaCl in benzene

The weight of 11.2 liters of CO₂ at S.T.P would be

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88 g

44 g

32 g

22 g

Which of the following is the simplest form of matter?

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Gaseous state

Liquid state

Solid state

All of above

Most of the reactions which give stable products are

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Endothermic

Exothermic

Isothermal

Non of these

Cholesterol is a precursor of steroid hormones, Choose the class of steroid:

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a carbohydrate

a hydrocarbon

a natural lipid

a protein a hydrocarbon

Which of the following carbohydrates is used in silvering of mirrors

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Sucrose

Cellulose

Fructose

Glucose

Example of essential aromatic amino acids

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Theronine

Alanine

Phenyl alanine

Glycine

Ozone is an allotropic form of:

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Carbon

Phosphorus

Oxygen

Sulfur

Which is not a component of environment?

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Biosphere

Lithosphere

Hydrosphere

None of these

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

H₂O is liquid at room temperature whereas H₂S is a gas because

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H₂O used as drinking water, but H₂S has rotten egg smell

H₂O is neutral. H₂S is a weak acid

stronger hydrogen bonding in H₂O than in H₂S

H₂O occurs abundantly than H₂S

The molarity of toluene solution in benzene is 0.22 if 5 grams of toluene dissolved, then mass of benzene is grams is

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267

260

240

247

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Electronphilic substitution

Electrophilic addition

Free radical substitution

Nuclephilic substitution

The mass of sulphur which combines with 24 grams oxygen to form SO₂

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32 gram

24 gram

8 gram

12 gram

Which one of the following statements is not correct

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A molecule is the smallest particle of an element which can exist independently

He is a molecule of helium

S₈is a molecule of sulphur

O₃is a molecule of oxygen

Chief ore of aluminium is:

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Na₃AIF₆

Al₂O₃.2H₂O

Al₂O₃

Al₂O₃ .H₂O

The quantitative relationship between the substances according to balanced equation describes

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Reversible reactions

Stoichiometry

Limiting reacting

Percentage composition

At present oil refineries in Pakistan are:

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One

Two

Three

Four

The oxidation state of an element is zero when

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It forms an oxide

It forms hydride

It is in free state

Only for noble gases

The base used in Cannizzaro's reaction is

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NaOH

KOH

CHI₃

All of these

Na reacts with phenol to produce

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H₂gas

Benzene

CO₂gas

CO gas

Grignard reagent on reaction with a ketone forms

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Tertiary alcohol

Secondary alcohol

Primary alcohol

Carboxylic acid

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