ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

It is common observation that rates of chemical reactions differ :

• Greatly. A
• A little bit. B
• Moderately. C

Keeping in view the size of atoms, which order is the correct one

• Mg > Sr A
• Ba > Mg B
• Lu > Ce C
• Cl > l D

Colour of chlorine is

• Pale yellow A
• Greenish yellow B
• Red brown C
• Greyish black D

An organic compound will decolorise dill acidified (aq) KMnO₄on warming, but will not decolorise bromine water. What is the compound

• KMnO₄ A
• Ethanol B
• Ethane C
• CH₃CH₂Cl D

What will be the weight of deposited silver on passing 965 coulombs of electricity in solution of AgNO₃?

• 1.08 g A
• 2.16 g B
• 0.54 g C
• 0.27 g D

Which of the following is not present in nucleotide?

• Guanine A
• Cytosine B
• Adenine C
• Tryoxine D

The equation for the first ionization energy of hydrogen is

• 
  A
• 
  B
• 
  C
• 
  D

A liquid on evaporation causes:

• Heating effect. A
• Cooling effect. B
• Suffocation . C
• All of above D

• Initial concentration of reaction A
• Initial concentration of products B
• Final concentration of products C
• Order of the reaction D

Lime is often used as an agent:

• dehydrating A
• hydrating B
• oxidizing C
• reducing D

Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane. the easter is

• Ethyl methonoate A
• Methyl ethanoate B
• Propylamine C
• Ethylamine D

Boric acid cannot be used:

• An antiseptic in medicine A
• For washing eyes B
• In soda bottles C
• For enamels and glazes D

Lead accumulator stops discharging current when

• Lead at anode converted to PbO₂ A
• PbO₂at cathode converted to Pb B
• Both electrodes are completely covered with PbSO₄ C
• Both electrodes are completely covered with Pb(OH)₂ D

Monosaccharides belong to the group

• Lipids A
• Fats B
• Proteins C
• Carbohydrates D

A solution can be

• Dilute and concentrated A
• Saturated and dilute B
• Saturated and unsaturated C
• Supersaturated and saturated D

For a gas obeying Boyle's law if pressure is doubled, the volume becomes :

• Remain constant A
• Double B
• One half C
• None of above D

A solution has 92 g of ethyl alcohol, 96 g of methyl alcohol and 90 g of water. Mole percentage of ethyl alcohol in the solution is

• 10 A
• 20 B
• 25 C
• 50 D

Tripple bond is present in

• O₂ A
• H₂ B
• N₂ C
• Cl₂ D

• 1st order A
• 2nd order B
• Zero order C
• 3rd order D

Rutherford's planetary like picture of the atomic modal was defective because

• It did not describe the quantity of positive charge A
• It did not explain the repulsion of protons within the nucleus B
• No empty space between nucleus and the electrons C
• Moving electron should radiate energy D

The electrolytic cell used for the production of metallic sodium is known as

• Down's cell A
• Solvary's cell B
• Haber's cell C
• None of these D

The method involved for electrolysis of Na or K salts of carboxylic acids

• Sabatier's sendrens reaction A
• Kolbe's method B
• Clemmensen C
• Wolf kishner reduction D

The oxides of which of the following elements will be acidic in character

• Mg A
• Rb B
• Li C
• Cl D

Which property is not present in lipids?

• Liquid A
• Solid or semi solid B
• Soluble in water C
• Form emultion 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

Number of moles of solute dissolved in 1 Kg of solvent is knowns as

• Molarity A
• Formality B
• Molality C
• Mole fraction D

DDT is

• Biodegradable pollutant A
• Nondegradable pollutant B
• Not a pollutant C
• An antibiotic D

A nuclophile must

• Be an atom A
• A group of atoms B
• Have a lone pair C
• Be negatively charged D

Organic compounds resemble to those of inorganic compounds having same

• Ionic properties A
• Carbon forming long chain or rings B
• Chemical forces C
• Isomerism D

The largest item which is recycled is

• Newspaper A
• Plastic B
• Aluminium C
• Oil D