ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The strongest acid is

• HF A
• HCl B
• HBr C
• HI D

• Le-chatlier's principle A
• Only adding catalyst B
• Decreasing pressure C
• Decreasing temperature D

Which property is not present in Al?

• Reacts with acid A
• Reacts with bases B
• Changes litmus paper C
• Changes methyle orange colour D

Which of the following sulphates has the highest solubility in water

• BaSO₄ A
• CaSO₄ B
• MgSO₄ C
• BeSO₄ D

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?

• Fullerences A
• Freons B
• Polyhalogens C
• Ferrocene D

II-A group element are called:

• s-block elements A
• p-block elements B
• d-block elements C
• f-block elements D

The weight of pure NaOH required to prepare 250 cm³of 0.1 N solution is

• 4 g A
• 1 g B
• 2 g C
• 5 g D

An ionic compound A+B is most likely to be formed when

• The ionization energy of A is high and electron affinity of B is low. A
• The ionization energy of A is low and electron affinity of B is high. B
• Both ionization energy of A and electron affinity of B are high. C
• Both ionization energy of A and electron affinity of B are low. D

Ethanal may be converted into a three-carbon acid in a two-step process.

Which compound is the intermediate

• CH₃CO₂H A
• CH₃CN B
• CH₃CH₂CN C
• CH₃CH(OH)CN D

Which of the following has ester linkage?

• Nylon A
• Bakelite B
• Terylene C
• PVC D

The change in heat energy of a chemical reaction at constant temperature and pressure is called

• entahlpy change A
• heat of sublimation B
• bond energy C
• internal energy change D

A half reaction can be defines as :

• It always occurs at cathode. A
• Involves only half of a mole of electrolyte. B
• Occurs at one of the electrode. C
• Goes only half way to completion. D

A graph between P and 1/V at constant temperature and number moles of a gas meets the

• y-axis A
• x-axis B
• origin C
• none of above D

DDT is formed from

• Benzene and Chlorobenzene A
• Chloral and Chlorobenzene B
• Chloral and Benzene C
• Chlorobenzene and chlorine D

Series starting form ₃₉Y to ₄₈CD is in period:

• 4th A
• 5th B
• 6th C
• 7th D

Which orbital is in the process of completion in case of transition elements

• p-orbital A
• f-orbital B
• d-orbital C
• s-orbital D

Maximum variable oxidation state is of:

• Mn⁺² A
• Fe⁺³ B
• Cr⁺¹ C
• a and b D

Ammonia is injected under the soil surface:

• 1 Feet A
• 6 inches B
• 6 Feet C
• 9 inches D

Acetone is prepared by

• Oxidation of n-propyl alcohol A
• Oxidation of acetaldehyde B
• Pyrolysis of calcium acetate C
• Pyrolysis of calcium acetate as well as acetic acid D

The next homologue of C₁₀H₂₂will be

• C₉H₂₀ A
• C₁₂H₂₆ B
• C₁₁H₂₄ C
• C₁₃H₂₈ D

Between CH₃COOH and HCOOH, HCOOH will be

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

Out of all the elements of group V-A , the highest ionization energy is possessed by:

• N A
• P B
• Sb C
• Bi D

Lower carboxylic acids are soluble in water due to

• Low molecular weight A
• Hydrogen bonding B
• Dissociation into ions C
• Easy hydrolysis D

Among group V-A elements, the most electronegative element is:

• Sb A
• N B
• P C
• As D

A zero order reaction is one in which :

• Rate is not affected by changing concentration of reactants. A
• concentration of reactants do not change with the passage of time. B
• Reactants do not react. C
• One reactants in large excess. D

Self condensation of acetaldehyde in the presence of dilute alkalies gives

• An acetal A
• An aldol B
• Mesitylene C
• Propionaldehyde D

Mark the correct statement

• Na⁺ is smaller than Na atom A
• Na⁺is larger than Na atom B
• Cl^-is the smaller than Cl atom C
• Cl^-(ion) and Cl (atom) are equal in size D

A reaction in which heat is given out is

• An endothermic reaction A
• An exothermic reaction B
• A thermochemical reaction C
• An energetic reaction D

alkaline metal have electrons in s-orbitals:

• One A
• Two B
• three C
• Four D

Which one of the following solution will have higher vapour pressure than that of water

• Aqueous solution of methanol A
• Aqueous solution of HCI B
• Aqueous solution of glucose C
• Aqueous solution of urea D