ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which causes water pollution?

• Smoke/fly ash A
• Automobile exhausts B
• Aeroplnes C
• 2,4-D and pesticides D

The forced which holds together two or more atoms or ions to form a large variety of compounds in called:

• A chemical bond. A
• An ionic bond. B
• A covalent bond. C
• A coordinate bond. D

Most metals are conductors of electricity because of the :

• Light weight. A
• Immobility of the electrons. B
• Lustrous surfaces C
• Relatively free movement of their electrons D

Soil salinity can be measured by

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

The degenerate orbitals p-sub shell are

• 2 A
• 3 B
• 5 C
• 7 D

The principle quantum number describes

• The distance form the nucleus A
• The shape of the orbital B
• The orientation of the orbital C
• The spin of the electron D

Atomospheric pollutant is

• CO₂ A
• CO B
• O₂ C
• N₂ D

Which one of the following gases is used for artificial ripening of fruits

• Ethane A
• Ethyne B
• Methane C
• Propane D

Ionization is the process in which ionic compounds when fused or dissolved in water split up into charged particles called :

• Atoms. A
• Electrons. B
• Protons . C
• Ions D

the element not known till Mandleev tabulated his periodic table:

• Carbon A
• Hydrogen B
• Aluminum C
• Germanium D

The distillation of coal at high temperature and in absence of air is called

• Vacuum distillation A
• Normal distillation B
• Fractional distillation C
• Destructive distillation D

I a chemical reaction equilibrium is said to have been established when :

• Rate of opposing reactions are equal. A
• Rate constants of opposing reactions are equal. B
• Opposing reactions stop. C
• Concentration of reactants and products are equal D

Aldol condensation is actually

• Electrophilic addition of carbonation A
• Electrophilic addition of carbonium ion B
• Nucleophilic addition of carbonation C
• Nuclephilic addition of carbonium ion D

Direct conversion of solid intro vapours is called:

• Crystallization A
• Sublimation B
• Obligation C
• Vapourization D

Permonosulphuric acid is known as

• Marshall's acid A
• Carlo's acid B
• Sulphuric acid C
• None of these D

Bleaching powder is agent:

• Dehydrating A
• Oxidazing B
• reducing C
• all D

Which is not the enzyme involved in the preparation of ethyl alcohol by fermentation of starch

• Diastase A
• Maltase B
• Zymase C
• Invertase D

Bleaching powder is prepared by the reaction of Cl₂ with.

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

Which of the following hydrogen halide is the weakest acid in solution?

• HF A
• HBr B
• Hl C
• HCl D

Which catalyst is used in contact process?

• Fe₂O₃ A
• V₂O₅ B
• SO₃ C
• Ag₂O D

Which of the following is halo form

• CHBr₃ A
• CHCI₃ B
• CHI₃ C
• All of these D

Ozone layer of stratosphere requires protection from indiscriminate use of

• Fungicides, insecticides, bactericides and medicines A
• Aerosols and high flying jets B
• Atomic explosions and industrial wastes C
• Baloons and turbo-prop aeroplanes D

The colour of a transition metal complex is due to d-d transition The colour of the complex is the complementary of the colour absorbed. Thus [Ti(H₂O₆]³⁺abosrbs yellow light and transmits blue and red colours therefore the solution of titanium complex appears

• Blue A
• Red B
• Yellow C
• Mixture of blue and red or violet D

Which of the following is not a fatty acid

• Propanoic acid A
• Acetic acid B
• Phthalic acid C
• Butanoic acid D

How many g of dibasic acid (mol. wt. 200) should be present in 100 ml of the aqueous solution to give 0.1 Normality?

• 1 g A
• 2 g B
• 10 g C
• 20 g D

All elements of group VI-A non-metal except

• Te A
• S B
• Se C
• Po D

Which of the following has more unpaired d-electrons?

• Zn⁺ A
• Fe²⁺ B
• Ni³⁺ C
• Cu⁺ D

• 0.5 A
• 4.0 B
• 2.5 C
• 0.25 D

96500 C of electricity liberates from CuSO₄solution

• 63.5 g of Cu A
• 31.75 g of Cu B
• 96500 g of Cu C
• 100 g of Cu D

Heavy water is obtained by

• Prolonged electrolysis of water A
• Dissolving heavy salt in water B
• Simple distillation of water C
• Removing impurities of calcium and magnesium form water D