ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The galvanic or voltaic cells which are rechargeable called as

• Primary cells A
• Secondary cells B
• Dry cells C
• Infinite cells D

• Excitantion of an electron from 2s to 2p-orbital A
• Transfer of three electrons from B to the other atoms B
• Excitation of two electrons form 2s orbital to 2p orbital C
• Formation of molecular ion D

The study of heat changes accompanying a chemical reaction is known as

• Thermochemistry A
• Biochemistry B
• Physical chemistry C
• Analytical chemistry D

When electrically is passed through molten Al₂O₃+ Na₃AlF₆and 13.5 gms of Al are deposited, the number of farady must be

• 0.5 A
• 1.0 B
• 1.5 C
• 2.0 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

• 0 1 A
• 0 2 B
• 1 1 C
• 1 2 D

If the rate of decay of radioactive isotope decreases from 200 cpm to 25 cpm after 24 hours, what is its half life :

• 8 hours A
• 6 hours B
• 4 hours C
• 3 hours D

Noble gases have the electronic configuration with their valance shell ns²np⁶except one

• He A
• Ne B
• Kr C
• Xe D

• 1, 5-pentadiene A
• Penta-1, 4-diene B
• 1, 1-pentadiene C
• 1, 4-pentene D

In the electrolysis of fused bauxite (Al₂O₃2H₂O) with fused Cryolite (Na₃AlF₆) using carbon rods as anode. The product obtained at cathode is

• Na metal A
• F₂gas B
• Al metal C
• O₂gas D

The solution of which acid is used for seasoning of food

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

Which is the property of benzene?

• decolourizes KMnO₄ A
• straight chain structure B
• only double bond is present C
• triple and double bond D

Which of the following is not a colligative property?

• Depression in freezing point A
• Elevation of boiling point B
• Osmotic pressure C
• Modification of refractive index D

Hydrolytic reaction of fats by causic soda is known as

• Acetylation A
• Carboxylation B
• Esterification C
• Saponification D

The rate of reaction determined at a given time is called

• Average rate A
• Instantaneous rate B
• Specific rate C
• Overall rate 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

Amorphous solids

• Have sharp melting point A
• Undergo clean cleavage when cut with knife B
• Have perfect arrangement of atoms C
• Can possesses small regions of orderly arrangement of atoms D

To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be

• Ag⁺ A
• Cu²⁺ B
• Al³⁺ C
• Si⁴⁺ D

Ethylene can be prepared in the laboratory by heating together ethyl alcohol and

• HCI A
• Phenol B
• HF C
• H₂SO₄ D

A process which takes place on its own without any outside assistance and moves from a non-equilibrium state towards an equilibrium state is termed as

• Spontaneous process A
• Natural process B
• Non-spontaneous process C
• Both a and b D

Which one of the following particles has amass 1/1836 time, that of hydrogen?

• Neutron. A
• Proton. B
• Electron. C
• Positron. D

For a gas obeying Boyle's law if pressure is doubled, the volume becomes :

• Remain constant A
• Double B
• One half C
• None of above D

Standard reduction of Zn = -0.76 V and that of Ni is -0.25 V. On coupling them by a salt bridge which of these will act as anode

• Salt bridge will act as anode A
• Zn will act as anode B
• Ni will act as anode C
• None of these D

Solvent extraction is an unstable,Process and it is controlled by:

• Alcohol extraction A
• Petrol extraction B
• Phenol extraction C
• Ether extraction D

Cement plaster is made by mixing plaster of paris with

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

The energy absorbed when an electron is added to a gaseous atom to form a gaseous ion is called

• Electron affinity A
• Ionization energy B
• Both of these C
• None of these D

Which of the following phosphorus is most reactive?

• Red phosphorus A
• White phosphorus B
• Scrlet phosphorus C
• Violet phosphorous D

If an electrophile attacks then ______ bond breaks first

• C - H A
• O - H B
• C - O C
• None of these D

Which of the following is a molecular diseases?

• Allergy A
• Cancer B
• German measles C
• Sickle cell anemia D

Which of the following reactions occur at moderate rate :

• Rusting of iron A
• Chemical weathering of stone work of buildings by acidic gases in atmosphere. B
• Hydrolysis of an ester C
• Fermentation of sugars D