ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Major fertilizers with micro-nutrients are:

• Nitrogeneous A
• Phosphalic B
• Potash C
• All of these D

The cell which generates electricity as a result of spontaneous oxidation-reduction reaction is called

• Electrolytic cell A
• Nelson's cell B
• Galvanic cell C
• Down's cell D

• Measuring pH A
• Measuring density B
• Titration against standard NaOH C
• Titration against standard KMnO₄solution D

Which of the following fluorides does not exists?

• NF₅ A
• PF₅ B
• AsF₅ C
• SbF₅ D

During the process of crystallization, the hot saturated solution:

• is cooled very slowly to get large size crystals A
• is cooled at a moderate rate to get medium sized crystals of the product B
• is evaporated to get the crystals of the products C
• is mixed with an immiscible liquid to get the pure crystals of the product. D

The amount of heat evolved or absorbed in a chemical reaction indicated by balanced chemical equation at 25° and one atmospheric pressure is called

• Enthalpy of formation A
• Enthalpy of neutralization B
• Enthaply of combustion C
• Enthaply of reaction D

An artificial smell of banana is produced in many articles y using esters which of the following is that

• Amyl acetate A
• Isoamyl valerate B
• Octyl acetate C
• Methyl butyrate D

Toluene is also called

• Hydroxyl benzene A
• Methyl benzene B
• ethyl benzene C
• None D

Increased asthmatic attacks in certain seasons are related to

• Inhalation of seasonal pollen A
• Eating of seasonal vegetables B
• Low temperature C
• Wet and dry environment D

Copper oxide is dedected by borax bead test with colour:

• Blue A
• Red B
• Yellow C
• Black D

Quantum number values for 2p orbitals are

• n = 2, l = 1 A
• n = 1, l = 2 B
• n = 1, l = 0 C
• n = 2, l = 0 D

Sulphuric acid is used

• As fertilizers A
• As dehydrating agent B
• As oxidizing agent C
• All above D

One mole of oxygen confined in a cylinder fitted with a piston is an example of

• Surrounding A
• System and surrounding B
• System C
• State function D

Scientific study of fermentation was first made by

• Buchner A
• Liebig B
• Biot C
• Pasteur D

Mottling of teeth is due to presence of an element in drinking water

• Mercury A
• Fluorine B
• Boron C
• Chlorine D

Bronze is an alloy which contains

• 60% cu A
• 70% cu B
• 80% cu C
• 99% cu D

Amongst the following the compound that can be most readily sulphonated is

• Toluene A
• Benzene B
• Nitrobenzene C
• Chlorobenzene D

Which alcohol gives only one oxidation product when wormed with dil acidified K₂Cr₂O₇

• Butan-1-ol A
• Butan-2-ol B
• 2-methyl propan-1-ol C
• 2-methyl propan-2-ol D

When a nitrogeneous base combine with a sugar it is called

• Ribose A
• Nucleotides B
• Nucleoside C
• None D

Arabic word "alkali" means:

• The ashes A
• the sour B
• The fragrant C
• Caustic D

Most reactive halide towards S_N1 reaction is

• n-Butyl chloride A
• sec-Butyl chloride B
• tert-Butyl choride C
• Allyl chloride D

The gases can be converted into liquids by:

• Increasing the pressure only. A
• Lowering temperature and increasing pressure B
• Increasing pressure and bringing temperature below critical points C
• Lowering temperature only D

Acetal is produced by reacting alcohol in the presence of dry HCl with

• Acetaldehyde A
• Ketone B
• Ether C
• Carboxylic acid D

Ketones are reduced to

• Primary alcohol A
• Secondary alcohol B
• Tertiary alcohol C
• All of these D

Which compound is called a universal solvent?

• H₂O A
• CH₃OH B
• C₂H₅OH C
• CH₃----O---CH₃ D

Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride

• The ionic radius of the NH₄⁺ion is similar to that of Mg²⁺but not that of Na⁺ A
• NH₄Cl dissociates less fully than NaCl B
• The ions Na⁺and Mg²⁺are isoelectronic (have the same number of electrons) C
• The ion NH⁺₄acts as an acid D

When initial concentration of reactants an order of reaction is given, then its half life period can be calculated by the equation

• 
  A
• 
  B
• 
  C
• 
  D

The compounds which have any atom other than Carbon atom, in rings are called as

• Monocyclic A
• Heterocyclic B
• Homocyclic C
• None of the above D

Ethyl acetate is obtained when methyl magnesium iodide reacts with

• Ethyl formate A
• Ethyl choroformate B
• Acetyl chloride C
• carbondioxide D

Amino acids contain functional groups in it:

• --CO-- A
• --OH B
• ---NH₂ C
• All of these D