ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The rate of E₁reaction depends upon

• The concentration of substrate A
• The concentration of nucleophile B
• THe concentration of substrate as well as nucleophile C
• None of the above D

The state of hybridization of carbon atom in methane is:

• sp³ A
• sp² B
• sp C
• dsp² D

Which of the following mixture of liquids show negative deviation form Raults law

• Ethyl alcohol and ether A
• HCI and water B
• Phenol- water C
• Chlorobenene-bromobenene D

Which of the following is a non-typical transition elements

• Cr A
• Mn B
• Zn C
• Fe D

Which gasoline is better?

• Of low boiling point A
• Of low molecular mass B
• Of high octane C
• All of these D

When a carboxylic acid reacts with a metal ______ gas is evolved

• H₂ A
• CO₂ B
• CI₂ C
• None of these D

A dry alkaline cell has porous Zn anode and MnO₂as cathode the electrolyte used is

• Ca(OH)₂ A
• NaOH B
• KOH C
• NH₄OH D

Terylene is madeby polymerization of terephthalic acid with

• Ethylene glycol A
• Phenol B
• Ethanol C
• Catechol D

When benzene is burnt in free supply of air, it is completely oxidized to

• CO A
• CO₂₊H₂O B
• H₂CO₃ C
• None D

_{Which compound is the most reactvie one:}

• benzene A
• ethene B
• ethane C
• ethyne D

Which of the following liquids has low vapour pressure at 25⁰C

• Diethyl ether A
• Acetone B
• Water C
• Ethyl alochol D

Which of the following oxides is peroxide?

• Na₂O₂ A
• MnO₂ B
• BaO C
• SO₂ D

Which of the electronic configuration of nitrogen in correct?

• 1S²,2S²,2P¹,2P¹,2P¹ A
• 1S², 2S², 2P³ B
• 1S²,2S²,2P²,2P¹,2P² C
• 1S²,2S²,2P⁶,3S²,3P⁶ D

Bleaching powder may be produced by passing chlorine over

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

The amount of solute present in the given amount of solvent is called

• Molarity A
• Molality B
• Concentration C
• Solubility D

Which has the least oxidizing power?

• F₂ A
• Cl₂ B
• Br₂ C
• I₂ D

The amount of Ni in stainless steel is

• 3% A
• 4% B
• 5% C
• 8% D

The volume of 0.1 M H₂SO₄required to neutralize completely 40 ml of 0.2 M NaOH solution is

• 10 ml A
• 40 ml B
• 20 ml C
• 50 ml 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

Cellulose does:

• Satisfy human appetite A
• Stimulates intestinal peristalsis B
• Gives fibre and bulk to the food C
• All of these D

Decreases om concentration of reactant is denoted by

• dc/dt A
• -dc/dt B
• +dc/dt C
• None D

Formaldehyde is used to make

• Plastics A
• Medicine B
• Antiseptic C
• All of these D

Ethyl acetate is obtained when methyl magnesium iodide reacts with

• Ethyl formate A
• Ethyl choroformate B
• Acetyl chloride C
• carbondioxide D

The electronegativity of elements in a period from left to right

• Decreases A
• Increases B
• First decreases then increases C
• First increases then decreases D

Which is used to remove air bubbles form metals?

• B A
• Be B
• Mg C
• Al D

The osmotic pressure of solution increases if

• Temperature is decreased A
• Solution constant is increased B
• Number of solute molecules are increased C
• Volume is increased D

Acetic acid is obtained when

• Methyl alcohol is oxidized with potassium permanganate A
• Calcium acetate is distilled in the presence of calcium formate B
• Acetaldehyde is oxidized with potassium dichromate and sulphuric acid C
• Glycerol is heated with sulphuric acid 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

The volume occupied by 1.4 g of N₂ at S.T.P is

• 2.24 dm³ A
• 22.4 dm³ B
• 1.12 dm³ C
• 112 cm³ D

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