Question # 1

Which of the following is an application of electrochemical series

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Prediction of the feasibility of chemical reaction

Calculation of the cell voltage

Prediction of reaction of metal with dilute acid

All of the above

Substances that tend to decrease the activity of enzymes are called:

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coenzymes

activators

inhibitors

apoenzyme

According to Lowery Bronsted concept, which of the following is considered as an acid?

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BF3

OH-

H3O+

Cl-

SO₂makes ___________ acid rains

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carbonic acid

Sulfuric

Nitric acid

All of these

Ozone gas has boiling point:

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Low

High

Medium

Highest

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

Which one is best buffer those have

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pH = pKa

pH > pKa

pOH < pKb

pKa =0

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

When the temperature is raised, the viscosity of the liquid decreases.This is because of

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Decreased volume of the solution

Increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them

Decreased covalent and hydrogen bond forces

Increased attraction between the moelcules

Part of fresh water consumed in industry is:

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1%

2%

69%

23%

At STP,a container has 1 mole of Ar,2 moles of CO₂,3 moles of O₂ and 4 moles of N₂.Without changing the total pressure if one mole of O₂ is removed,the partial pressure of O₂

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Is changed by about 26%

Is halved

Is unchanged

Change by 33%

The solution of which acid is used for seasoning of food

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Formic acid

Acetic acid

Benzoic acid

Butanoic acid

The sp²hybird orbitals are oriented in space at one angle

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180°

109.5°

100°

120°

The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in

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-1.86°C

-3.72°C

+1.86°C

+3.72°C

Benzene is obtained from benzene sulphonic acid by treating with

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HCl

NaOH

H₂O

NaHCO₃

As a fixing agent in photography, sodium thisoulphate is used for

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Dissolving out unreacted silver bromide

Converting silver

Reducing solubility of AgBr

Preventing overdeveloping and fogging

Which is the derived lipid?

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Common fats

Vitamin-D

Common oils

Spinolipids

Which compound was recognized the parent member of aromatic compounds

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Aniline

Phenol

Benzene

Toluene

Which of the following derivative can not be prepared directly from acetic acid

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Acetamide

Acetyl chloride

Acetic anhydride

Ethyl acetate

Which inorganic precipitate acts as semipermeable membrane?

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Calcium sulphate

Barium oxalate

Nickel phosphate

Copper ferrocyanide

Cracking normally gives smaller ______

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Alkanes

Alkenes

Alkynes

Both a and b

To get DDT, chlorobenzene has to react with one of the following compound in the presence of conc.H₂SO₄

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Trichloroethane

Dichloroacetone

Dichloroacetaldehyde

Trichloroacetealdehyde

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