Question # 1

Helical structure of protein is stabilized by

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Peptide bond

Dipeptide bond

Van der wall's forces

Hydrogen bonding

The cell which converts electrical energy to chemical energy is called

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Electrochemical cell

Voltaic cell

Galvanic cell

Down's cell

At higher temperature what is true for gases

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pressure is decreased

volume is decreased

number of moles are decreased

KE is increased

_{What is name of hydrated variety of quartz?}

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Rose quartz

Smokey quartz

Silica

Opal

Which one of the following is an appropriate indication of positive iodoform test?

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Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

Covalent bonds are least likely to be formed:

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between atoms of the same element

between atoms of different elements on the right of the periodic table

by head of the group elements with high ionization energies

between an element in Group I and an element in Group Vll

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

Alkaline phosphatese is associated with ______ disease

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Heart disease

Rickets

Diabtese

None

Which of the following is electrophile for alkylation?

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NO+2

SO3

R+

Both a & b

Which of the following is acidic?

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SO₃

N₂O

BeO

HgO

Acetone reacts with HCN to form a cyanohydrin. It is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Which one of the following is a buffer

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HCI + NaCI solution

CH₃COOH + CH₃COONH₄solution

H₂SO₄+ CaSO₄solution

CH₃COOH + CH₃COONa

Which of the following is known as wood spirit

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Ethyl alcohol

Propyl alcohol

Methyl alcohol

Butyl alcohol

The proteins which are derived by conjugated proteins are called as

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Simple protein

Complex protein

Derived protein

None

The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to

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4-Bromobenzyl cyanide

4-Cyanobenzyl chloride

4-Cyanobenzyle cyanide

4-Bromo 2-cyanobenzyl chloride

CsF is an ionic compound because:

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High I.P of Cs and high E.A of F.

High I.P of Cs and low E.A of F.

Low I.P of Cs and high E.A of F.

Low I.P of Cs and low E.A of F.

Which one is the most toxic?

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Carbon

CO

CO₂

SO₂

Which one of the following compounds does not have the empirical formula CH₂O?

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Ethanoic acid, CH₃CO₂H

Ethanol, CH₃CH₂OH

Glucose, C₆H₁₂O₆

Methanal, HCHO

One mole of ethanol and one mole of ethane have an equal

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Mass

Number of atoms

Number of electrons

Number of molecules

Ethanol is prepared in Pakistan form fermentation of:

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Starch

Sugar

Glucose

Molasses

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