ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

During redox reaction an oxidizing agent

• Gains electrons A
• Is oxidized B
• Loses electrons C
• Hydrolysed D

Orbitals having same energy are called

• Hybrid orbitals A
• Valence orbitals B
• Degenerate orbitals C
• D-orbitals D

• Iodine can oxidise iron A
• Bromine can oxidise iron B
• Iodine can oxidise bromine C
• Iron can oxidise bromine D

The shape of the molecule SF₂Cl₂is

• Trigonal bipyradmidal A
• Cubic B
• Octahedral C
• Tetrahedral D

Group VII-A elements are called:

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

Maximum freezing point falls in

• Camphor A
• Naphthalene B
• Benzene C
• Water D

Liquids are less common than

• Solids A
• Plasmas B
• Gases C
• All of above D

A solution of glucose is of methanol in water has vapor pressure :

• Equal that of water. A
• Equal to that of methanol. B
• More than that of water. C
• Less than that f water. D

The process in which the solvent molecules are surrounded and interact with solute ions or molecules is called

• Solvation A
• Hydration B
• Hydrogenation C
• None D

The change in concentration of reactant or product per unit time is called :

• Rate constant. A
• Rate of reaction. B
• Rate equation. C
• Rate law. D

Which of the following are electropositive in nature

• Alkali metals A
• Alkaline earth metals B
• Halogens C
• Alkali and alkaline earth metals D

When an electron is absorbed in an empty or partially filled orbital of an atom, the energy released is called

• Ionization energy A
• Potential energy B
• Electron affinity C
• Bond energy D

In Boyle's law which of the following pair remains constant :

• Temperature and quality of a gas. A
• Pressure and quality of a gas. B
• Temperature and pressure C
• Temperature and quantity of a gas. D

Which of the following is acidic?

• SO₃ A
• N₂O B
• BeO C
• HgO D

The solubility of KCIO₃salt in water is decreased by adding

• NaCIO₃ A
• NaCI B
• KCIO₄ C
• KCI D

The most reactive compound for electrophilic nitration will be

• Benzyl chloride A
• Benzoic acid B
• Nitrobenzene C
• Chlorobenzene D

Aqua Regia has ration of conc. HCl and HNO₃.

• 1 : 2 A
• 1 : 3 B
• 1 : 4 C
• 2 : 3 D

Cement plaster is made by mixing plaster of paris with

• glue or oil A
• gypson B
• glycol C
• alum or borax D

Work is a

• State function A
• Only function B
• Non-state function C
• State D

Atomic radius changes from top to bottom in a group.:

• Increases A
• Decreases B
• Remains same C
• Sometimes increases & Decreases D

Which of the following electronic configurations represents an element that forms a simple ion with a charge of +3

• 1s²,2s²,2p⁶,3s²,2p¹ A
• 1s²,2s²,2p⁶,3s²,3p³,3d¹ B
• 1s²,2s²,2p²,2p¹,2p² C
• 1s²,2s²,2p⁶,3s²,3p⁶ D

The overlapping of two partially filled atomic orbital is in such a way that the probability of finding the electron pair is maximum along the axis joining the two nuclei, the bond is

• Sigma bond A
• Pi bond B
• Ionic bond C
• Non-polar bond D

3.01 x 10²²Ag⁺ions is present in

• 85 grams AgNO₃ A
• 0.85 g AgNO₃ B
• 8.5 g AgNO₃ C
• 18.5 g AgNO₃ D

When of the following is isolelectronic with krypton

• Ca⁺⁺ A
• Al⁺⁺⁺ B
• Br^-1 C
• I^-1 D

Which of the following has highest dipole moment?

• NH₃ A
• PH₃ B
• AsH₃ C
• SbH₃ D

Perchloric acid can be stored in solution form

• 47% A
• 57% B
• 67% C
• 77% D

At present the number of fertilizers plants in Pakistan are

• 10 A
• 12 B
• 14 C
• 20 D

Acid rain is due to increase in atmospheric concentration of

• Ozone and dust A
• CO₂and CO B
• SO₃and CO C
• SO₂and NO₂ D

The difference between amount of heat actually released and that of calculated is called

• Bonding energy A
• Activation energy B
• Resonance energy C
• Transition energy D

Which statement is incorrect for balancing of redox reactions by ion-electron method

• The reaction is splitted into two half reactions A
• H₂O and H⁺ions are added for acidic or neutral reaction to balance O and H atoms B
• To balance H, HCi, is added C
• To balance O and H in the alkaline reaction OH^-added D