ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following does not react with phenyl hydrazine?

• Ethanol A
• Ethanal B
• Acetone C
• Acetophenone D

Law of mass action states that rate of chemical reaction is directly proportional to the product of active masses of the reactants. The term active mass means

• Mass in grams converted to products A
• Number of moles B
• Number of moles per dm³of reactants C
• Total pressures of the reactants D

The molarity of the solution containing x grams (NH₄)₂SO₄in 500 cm³of the solution is 0.6 what is x

• 39.6 A
• 45.1 B
• 40.5 C
• 42.7 D

Which are used as essences(flowers)?

• aldehydes A
• Ketones B
• alcohols C
• esters D

Taste of lower alcohols is:

• Sweet A
• Bitter B
• Our C
• Salty D

Pakistan at the time of existence in 1947 was a country:

• agrarian A
• industrial B
• nuclear C
• economically strong D

Which one of the following substance is use as decolonizing agent

• Asbestos A
• Animal charcoal B
• conc, H₂SO₄ C
• Silica gel D

With the increase in carbon no. the solubility of carboxylic acids

• Increases A
• Decreases B
• Remains same C
• None of these D

Soil salinity can be measured by

• Calorimeter A
• Potometer B
• Porometer C
• Conducitvity meter D

Smallest particle of an element which may or may not have independent existence is known as:

• A molecule A
• An ion B
• An atom C
• An electron D

Sodium can be obtained by :

• Electrolysis of acidified water. A
• By heating NaCl and water at 100°
  B
• Electrolysis of molten sodium chloride. C
• Electrolysis of aqueous sodium chloride. D

When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is

• Zero A
• First B
• Second C
• Third D

To calculate volume of the solvent, we need to know, the :

• Density of solute A
• Normality of solute B
• Mass of solute C
• Molarity of solute D

When hydrogen cyanide is added to an Aldehyde in the presence of ammonia it is called

• Strecker synthesis A
• Cory house synthesis B
• Williamson;s synthesis C
• None of these D

Soft drinks and baby feeding bottles are generally made up of

• Polyester A
• Polyurethane B
• Polyurea C
• Polystyrene D

Aliphatic carboxylic acids have carboxyl group attached to:

• Alkyl group A
• Aryl group B
• Phenyl group C
• Benzyl lgroup D

Which is not a calcarious material

• lime A
• clay B
• marble C
• marine shell D

The positive ion is always smaller than the neutral atom while the negative ion is always bigger than the neutral atom. The atomic and ionic radii of Na, F, Na⁺, F^-are in ppm

• Na F Na⁺ F^-
  157 72 95 136
  A
• Na F Na⁺ F^-
  157 95 172 136
  B
• Na F Na⁺ F^-
  72 95 136 157
  C
• Na F Na⁺ F^-
  157 136 95 72
  D

Which of the following does not turn Schiff's reagent to pink?

• Formaldehyde A
• Bezaldehyde B
• Aceton C
• Methyl chloride D

How many monochlorobutanes will be possible on chlorination of n-butane?

• 1 A
• 2 B
• 3 C
• 5 D

Hemoglobin is 68000 times heavier than:

• Oxygen atom A
• Nitrogen atom B
• Carbon atom C
• Hydrogen atom D

Each of the following is true of white and red phosphours except that they

• Are both soluble in CS₂ A
• Can be oxidized by heating in air B
• Consist of the same kind of atoms C
• Can be converted into one another D

Which of the following is not aromatic hydrogencarbon

• Benzene A
• Naphthalene B
• Toluene C
• Cyclohexene D

The addition of HCN to carbonyl compounds is an example of

• Nucleopihlic substituion A
• Electrophilic addition B
• Nueleophilic addition C
• Electrophilic substitution D

Which compound contains - OH in their molecule

• Alcohol A
• Phenol B
• Alcohol and phenol C
• Ether D

The actual number of atoms or molecules taking part in rate determining step is

• Rate of reaction A
• Velocity of reaction B
• Order of reaction C
• Molecularly D

Which terms was derived from " aroma"?

• atom A
• hydrocarbons B
• aromatic C
• aliphatic D

Bleaching powder is prepared by the reaction of Cl₂ with.

• Lime stone A
• Lime water B
• slaked lime C
• Lime D

• 0.60 A
• 1.67 B
• 0.66 C
• 2.6 D

Which of the following does give violet colour with neutral ferric chloride?

• Acetic acid A
• Salicaylic acid B
• Formine acid C
• Benzoic acid D