ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

In a Galvanic cell

• Chemical energy is converted into electricity A
• Chemical energy is converted into heat B
• Electrical energy is converted into heat C
• Electrical energy is converted into chemical energy D

The quantum number which determines the shape of the orbital is

• principal A
• azimuthal B
• magnetic C
• spin D

A cell in which electric current is produced as a result spontaneous redox reaction is called :

• Dry cell A
• Electrolytic cell B
• Galvanic cell C
• Standard cell D

In public urinals, we observe some nascent smell. This smell is due to

• Hydrolysis of urea of urine by urease of atmosphere into NH₃and CO₂ A
• Formation of sulphonic acid by urea of urine B
• Reaction of CO₂of atmosphere with urea monoitrate in urine C
• Hydrogen present in air reacts with nitrogen forming NH₃ D

Polyester resins have special use in:

• Clothing A
• Paints B
• Emulsion C
• Floor covering D

Bakelite is obtained from phenol by reacting with

• Acetaldehyde A
• Acetal B
• Formaldehyde C
• Chlorobenzene D

Replacement of hydrogen atom by - SO₃H group in benzene is called

• Nitration A
• Alkylation B
• Sulphonation C
• Acylation D

The condition for standard enthalpy change is

• 1 atm 30°C A
• 1 atm 50°C B
• 1 atm 25°C C
• 760 atm 25°C D

If the difference of pKa values of the two acids is 2, then

• Acid with smaller pKa is 10 times stronger acid A
• Acid with greater pKa is 10 times stronger acid B
• Acid with smaller pKa is 100 times stronger acid C
• Acid with greater pKa is 100 times stronger acid D

The reaction rate is expressed in the units of

• Mol dm^-3S^- A
• Mol dm^-3 B
• Mol dm^-3N^- C
• dm^-3S^- D

For which system does the equilibrium constant. K_c has units of

• 
  A
• 
  B
• 
  C
• 
  D

Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane. the easter is

• Ethyl methonoate A
• Methyl ethanoate B
• Propylamine C
• Ethylamine 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

When a carbon atom forms single bonds with other carbon atoms, these hybrid orbitals overlap with the orbitals of hydrogen to form four bonds which are

• Three sigma and one P_i A
• Two sigma and two P_i B
• One sigma and three P_i C
• sigma D

Dehydration of ethyl alcohol yields

• Aldehyde A
• Ketone B
• Acid C
• Alkene D

Carbonates of alkali metals dissolves freely in water to form

• Acidic solutions A
• Neutral solution B
• Alkaline solution C
• None of these D

The increase in size of the anion is due to:

• Increase in electron-electron repulsion A
• Increase in valence shell electrons. B
• Decrease in valence shell electrons. C
• Both (a) and (b). D

During the manufacturing process of cement the temperature of the decomposition zone goes up to

• 600°C A
• 800°C B
• 1000°C C
• 1200°C D

Which salt is used for preserving food

• BaCl₂ A
• CaCl₂ B
• NaCl C
• Na₂SO₄ D

Chief ore of aluminium is:

• Na₃AIF₆ A
• Al₂O₃.2H₂O B
• Al₂O₃ C
• Al₂O₃ .H₂O D

Out of all the elements of group V1-A the highest melting and boiling points is shown by the element

• Te A
• Se B
• S C
• Pb D

Dobereiner gave his law in the year:

• 1829 A
• 1864 B
• 1871 C
• 1931 D

An organic acdi having molecular formula C₂H₄O₂is

• Formic acid A
• Acetic acid B
• Oxalic acid C
• Propionic acid D

Anode is the surface on which probability of finding electron is:

• 50% A
• Less than 10%. B
• More than 95%. C
• Zero. D

The term cryoscopy is used for

• Depression of freezing point A
• Elevation in boiling poing B
• Lowering of vapour pressure C
• Osmotic pressure D

The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration, K equilibrium is

• 0.5 A
• 1.5 B
• 2.5 C
• 2.0 D

• Aqueous bromine A
• Dilute HNO₃ B
• Dilute HCI C
• CH₃COCI D

In electronic watches or electronic calculators the tiny batteries used are

• Alkaline battery A
• NICAD battery B
• Fuel cell C
• Silver oxide battery D

Debye forces are present in one of the following pairs

• Na⁺ion and water A
• Argon and water B
• Argon and Na⁺ion C
• Ne and Water D

The benzene molecule contains

• Three double bond A
• Two double bond B
• One double bond C
• Delocalized pie electron charge D