ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Elimination bimolecular reactions involve:

• First order Kinetics A
• Third order kinetics B
• Zero order kinetics C

Which one of the following in mainly responsible for depletion of ozone layer?

• Methane A
• Carbon dioxide B
• Water C
• chloroflurocarbons D

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄or LiAIH₄?

• 1-propanol A
• 2-propanol B
• 2-Methyl-2-propanol C
• Ethanol D

Between CH₃COOH and HCOOH, HCOOH will be

• Less acidic A
• Equally acidic B
• More acidic C
• None D

0.5 mole of CH4and 0.5 mole of SO2gases have equal

• Volume A
• Mass in grams B
• Total number of atoms C
• Number of molecules D

Number of elements in the first period of the periodic table are

• Two A
• Four B
• One C
• Eight D

B-atom in BF₃has

• sp³hybridization A
• sp²hybridization B
• sp hybridization C
• no hybridization D

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.2965 V at 25°C. The equilibrium constant of the reaction would be

• 1.0 x 10¹⁰ A
• 2.0 x 10¹¹ B
• 4.0 x 10¹² C
• 1.0 x 10² D

Product of concentration of ions raised to the power equal to the co-efficient of ions in balanced equation for saturated solution of a salt is called

• Ionic product A
• Equilibrium constant K_c B
• K_w C
• Solubility product (K_sp) D

Kinetic energy of the molecules is due to

• Transnational motion A
• Rotational motion B
• Vibrational motion C
• All of these 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

Which colour is imparted by sodium

• Yellow A
• Violet B
• Red C
• Crimson D

Aromatic compounds burn with sooty flame cause

• They have high percentage of hydrogen A
• They have a ring structure B
• They have high percentage of carbon C
• They resist reaction with air D

Which statement is true about order of reaction :

• Order of reaction can only be determined by an experiment. A
• Order of reaction can be determined from a balance equation only. B
• Order of reaction increase by increasing temperature. C
• Order of reaction must be in whole number and not in fraction. D

• Shift reaction toward forward direction A
• Shift reaction backward B
• Lower the value of K_c C
• No change in reaction D

Which gas is heavier than air?

• CO₂ A
• NH₃ B
• Cl₂ C
• CO₂ D

Benzene gives reactions generally

• electrophilic A
• addition substitution B
• synthesis C
• addition and electrophilic substitution D

Neutralization of a strong acid with a strong base is

• Natural acid base reaction A
• Artificial acid base reaction B
• Spontaneous acid base reaction C
• both a and c D

Copper oxide is dedected by borax bead test with colour:

• Blue A
• Red B
• Yellow C
• Black D

• Forward A
• Backward B
• Already in equilibrium C
• K_cis never less D

If liquids A and B form an ideal solution

• The enthalpy of mixing is zero A
• The entropy of mixing is zero B
• The free energy of mixing is zero
  C
• The free energy as well as the entropy of mixing are each zero D

Common names of aldehydes are given by corresponding:

• Ketone A
• Alcohol B
• Carboxylic acid C
• ester D

Glacial acetic acid freezes to ice like solid it.

• 07 A
• 17 B
• 27 C
• 37 D

The value of R(General Gas Constant) is

• 8.3134 JK^-1mole^-1

  A

• 1.987 Cal K^-1Mole^-1

  B
• Both a and b C

• 1.987 JK^-1mole^-1

  D

Alcohol can be denaturated by adding:

• Acetone A
• Methanol B
• Pyridine C
• All D

The function of salt bridge in galvanic cell is

• To prevent accumulation of ions in two half A
• To add salt ions in two half B
• To block flow of ions between two half C
• None of these D

Bond angle in benzene is :

• 109..5^o A
• 180^o B
• 120^o C
• 107.2^o D

Glycine at pH7 has the structure

• H₂N -- CH₂ -- COOH A
• H₃N⁺-- CH₂-- COOH B
• H₂N -- CH₂COO^- C
• H₃N⁺-- CH₂-- COO^- D

Which property is not present in lipids?

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

The fibre which contains polymers of vinylidine chloride as fibre forming substance is known as

• Saran fibre A
• Nylon B
• Polyester C
• Acetate fibre D