ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

A bond between two atoms may be obtained by sharing of electrons such a bond is called

• An ionic bond A
• A coordinate bond B
• A dative bond C
• A covalent bond D

A molecule in which sp²hybrid orbitals are used by the central atom in forming covalent bonds in

• He₂ A
• SO₂ B
• PCl₅ C
• N₂ D

The electron affinity of chlorine may be represented by the equation

• 
  A
• 
  B
• 
  C
• 
  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

Electronegativity order of alkyl halides is:

• Rl > RBr > RCl > RF A
• Rbr > RCl > RF >Rl B
• RCl > RF >Rl > RBr C
• RF >Ri > RBr >RII D

Fe⁺³and Mn²⁺are strong paramagnetic because the number of unpaired electrons in each is

• 4 A
• 5 B
• 6 C
• 7 D

The solution of which acid is used for seosoning of food ?

• Formic acid A
• Acetic acid B
• Benzoic acid C
• Butanoic acid D

Distillation of calcium salts of acetic acid and formic acids gives acetaldehyde. What compound would be obtained if only calcium salt of acetic acid is distilled

• Formaldehyde A
• Butyraldehyde B
• Propionaldehyde C
• Acetone D

Which of the following has highest oxidation potential

• Be A
• Li B
• Na C
• Ca D

Which one of the following is not an alkali metal?

• Francium A
• Caesium B
• Rubidium C
• Radium D

Purification of an impure copper is made by electrolytic cell, in which impure copper is anode and pure copper is cathode, and the electrolyte used is

• H₂SO₄ A
• CuSO₄ B
• ZnSO₄ C
• Na₂SO₄ D

High purity copper metal is obtained by

• Carbon reduction A
• Hydrogen reduction B
• Electrolytic reduction C
• Thermite reduction D

All 3d series elements show variable oxidation states. The one shown by all 3d elements is

• +2 A
• +3 B
• +4 C
• +5 D

Lithium reacts with air to form

• Peroxide A
• Normal oxide B
• Superoxide C
• None of these D

A solution of NaOH has pH = 13, then concentration of NaOH is

• 10^-13M A
• 10¹³M B
• 10^-1M C
• 10⁺¹M D

• 0.5 A
• 4.0 B
• 2.5 C
• 0.25 D

The molecules of CO₂in dry ice from the

• Ionic crystalls A
• Covalent crystals B
• Molecular crystals C
• Any type of crystal D

The solubility product of AgCl is 2.0 x 10^-10mol²dm^-6The maximum concentration of Ag⁺ions in the solution is

• 2.0 x 10^-10mol dm^-3 A
• 1.41 x 10^-5mol dm^-3 B
• 1.0 x 10^-10mol dm^-3 C
• 4.0 x 10^-20mol dm^-3 D

Which of the following gives iodoform on heating with a solution of I₂containing Na₂CO₃?

• Ethyl alcohol A
• Acetone B
• Ethyl alcohol as well as acetone C
• Methyl alcohol D

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

• Electric field A
• Magnetic field B
• Incident light C
• X-rays D

The valence orbital configuration of an element with atomic number 23 is

• 3d⁵ A
• 3d³, 4s² B
• 3d³, 4s¹, 4p¹ C
• 3d²,4s²,4p¹ D

2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is

• 2-Ethoxypentane A
• Pent-1-ene B
• cis-Pent-2-ene C
• trans-Pent-2-ene D

One mole of ethanol and one mole of ethane have an equal

• Mass A
• Number of atoms B
• Number of electrons C
• Number of molecules D

Compounds having the same molecular formula, but different functional groups show

• Metamerism A
• Position isomerism B
• Chain isomerism C
• Functional group isomerism D

In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled then the equilibrium constant will

• Also be doubled A
• Be halved B
• Becomes one fourth C
• Remains the same D

Unpleasant smell of carbylamine is obtained when chloroform and alcoholic KOH are heated with

• Any aromatic amine A
• Any primary amine B
• Any amine C
• Any aliphatic amine D

An element that has a high ionization energy and tends to be chemically inactive would most likely to be:

• an alkali metal A
• a transition element B
• a noble gas C
• a halogen D

Which of the following are thermoplastic materials

• PVC A
• Polystyrenes B
• Polyethylene C
• All these D

Bronze is an alloy which contains

• 60% cu A
• 70% cu B
• 80% cu C
• 99% cu D

The number of unpaired electrons in ferrous ion ( Z - 26) is

• 3 A
• 2 B
• 4 C
• 5 D