ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The rate of reaction :

• Remain same as reaction proceeds. A
• May decrease or increase as reaction proceeds . B
• Increase as reaction proceeds. C
• Decreases as reaction proceeds. D

Mustard gas is a

• Gas A
• High boiling speed B
• High melting liquid C
• Steam D

Which of the following does give violet colour with neutral ferric chloride?

• Acetic acid A
• Salicaylic acid B
• Formine acid C
• Benzoic acid D

Which phosphorus is the most poisonous?

• White A
• Red B
• Black C
• All D

Of the following four reactions, formic acid and acetic acid differ in which respect?

• Replacement of hydrogen by sodium A
• Formation of ester with alcohol B
• Reduction of Fehling solution C
• Blue litmus reaction D

The rate of diffusion of a gas is :

• Inversely proportional to its density A
• Inversely proportional to square root of its molecular mass B
• Directly proportional to molecular mass C
• Directly proportional to its density D

The reaction of an alkyl halide with RCOOAg produces

• Ester A
• Ether B
• Aldehyde C
• Ketone D

Essential amino acids are those amino acids which

• Body can not synthesize A
• Body can synthesize B
• α-amino acids C
• β-amino acids D

The largest item which is recycled is

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

Bleaching powder may be produced by passing chlorine over

• Calcium carbonate A
• Hydrated calcium sulphate B
• Anhydrous calcium sulphate C
• Calcium hydroxide D

Sulphonation of benzoic acid produces mainly

• o-Sulphobenzoic acid A
• m-sulohobenzoic acid B
• p-Sulphobenzoic acid C
• o-and p-Sulphobenzoic acid D

The rate determining step is the :

• Slowest step. A
• Fastest step. B
• Moderate step. C
• Both (a) and (b). D

Two solutions of NaCl and KCl are prepared separately by dissolving 0.1 M of the solute in water. Which of the following statements is not true for these solution

• KCl solution will have higher boiling point than NaCl solution A
• Both the solutions have same boiling B
• KCl and NaCl solution possess same vapour pressure C
• KCl solution possess same freezing point at NaCl solution D

In the periodic table, the element with atomic number 16 will be placed in the group

• Fourteen A
• Sixteen B
• Thirteen C
• Fifteen D

In the hydrolysis of CH₃COOC₂H₅the acid produced is

• Inhibitor A
• Catalyst B
• Auto catalyst C
• None of above D

The hybirdization in benzene is:

• sp³ A
• sp² B
• sp² C
• dsp² D

The substances that are added to the soil to provide nutrient or assential elements required for plant growth, are called

• Additives A
• Fertilizer B
• Manures C
• Posticides D

At present the number of fertilizers plants in Pakistan are

• 10 A
• 12 B
• 14 C
• 20 D

Which is a component of micro nutrient?

• N A
• Zn B
• P C
• K D

Which of the following is formed by the action of water on sodium peroxide?

• H₂ A
• N₂ B
• O₂ C
• CO₂ D

Lysine is ______ amino acid

• Acidic A
• Basic B
• Natural C
• None of these D

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

• Enthalpy change. A
• Seat of sublimation. B
• Bind energy. C
• Internal energy change. D

• High temperature A
• Low temperature B
• Low pressure C
• High pressure D

Number of neutrons in heavy hydrogen atom is

• 0 A
• 1 B
• 2 C
• 3 D

The oxidation number of each element of group l-A is

• 0 A
• +1 B
• +2 C
• -1 D

The heat of formation of SO₂(g) is -70.9 Kcal. The energy required for the decomposition of 1 mole of SO₂(g) is

• 35.50 Kcal A
• 70.9 Kcal B
• 141.8 Kcal C
• -35.9 Kcal D

• 8 A
• 4 B
• 9 C
• 3 D

Solubility of a substance in water decreases with rise in temperature except

• CaCI₂. 6H₂O A
• Pb(NO₃)₂ B
• K₂Cr₂O₇ C
• Ce₂(SO₄)₃ D

Each of the following compounds is effective as a refrigerant. The release of which one of these causes the greatest depletion of the ozone layer

• CCl₂F₂ A
• CH₃OCH₃ B
• CH₃CHF₂ C
• CH₃CH₂CH₃ D

Which statement is not correct

• Enzymes catalyst a specific reaction A
• Enzymes show catalytic activity at a specific temperature B
• The catalytic activity of enzymes is stopped if optimum pH is changed C
• The catalytic activity is poisoned by a co-enzymes D