ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

A chemical inert and heat resistant plastic, that is made form tetrafluoroethlene, is called

• Teflon A
• PVC B
• Bakelite C
• Polyamide D

n + l value for 4f will

• 2 A
• 5 B
• 7 C
• 9 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

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

When during electrolysis of a solution of AgNO₃, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

• 1.08 g A
• 10.8 g B
• 21.6 g C
• 108 g D

Covalent compounds are soluble in

• Polar solvents A
• Non-polar solvents B
• Concentrated acids C
• All solvents D

Two vitamins absorbed from intestine along with fats are

• A, D A
• A, B B
• A, C C
• D, B D

Alkanes may be prepared by the reaction of alkyl halides with

• Alcohol A
• Carboxylic acid B
• Grignard reagents C
• None of these D

Which of the following is a carbonate are?

• Pyrolusite A
• Malchite B
• Diaspore C
• cassiterite D

The radius of second Bohr's orbit is

• 0.053 nm A
• 0.053/4 nm B
• 0.053 x 4 nm C
• 0.053 x 20 nm D

The weight of pure NaOH required to prepare 250 cm³of 0.1 N solution is

• 4 g A
• 1 g B
• 2 g C
• 5 g D

Oxidation state of an element in free state is:

• Its numebr of elemtrons lost A
• Its number of electrons gained B
• zero C
• Its number of electrons shared D

The melting point is lowest for

• Be A
• Mg B
• Ca C
• Sr D

Allotropic forms of sulpher are

• Two A
• Three B
• Four C
• Five D

Hydrolysis of sucrose is called

• Inhibition A
• Saponification B
• Inversion C
• Hydration D

The concentration of reactants is increased by x, then equilibrium constant K becomes

• ln K/x A
• K/x B
• K + x C
• K D

Noble gases in the atmosphere are

• 4% A
• 3% B
• 2% C
• 1% D

Hydrolysis of alkyl nitriles is done to get carboxylic acids in the presence of

• Mineral acids A
• Mineral alkalies B
• Organics acids C
• Minerals acids & alkalies D

Which is not a steroid

• Cholesterol A
• Ergosterol B
• Phospholipids C
• None of these D

Which of the following is a member of -block

• Zn A
• Al B
• B C
• Br D

• Introduction of an inert gas at constant volume A
• Introduction of PCl₃(g) at constant B
• Introduction of PCl₅(g) at constant volume C
• Introduction of Cl₂at constant volume D

Cellulose does:

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

Formation of NO from N₂ and O₂ requires temp

• 30⁰C A
• 300⁰C B
• 3000⁰C C
• 30000⁰C D

Which one of the following substances is a synthetic polyester

• Cotton A
• Nylon B
• Rayon C
• Terylene D

Which of the following d-block elements can show the highest oxidation number in its compounds

• Chromium A
• Copper B
• Nickel C
• Manganese D

A white precipitate ofsilver chlorideimmediately formed on additionof :

• Silver nitrate solution to sodium chloride solution. A
• Silver chloride solution to sodium nitrate solution. B
• Silver nitrate solution to potassium chloride solution C
• Silver nitrate solution to hydrogen chloride solution. D

• Favour the formation of N₂O₄ A
• Favour the decomposition of N₂O₄ B
• Not alter the equilibrium C
• Stop the reaction D

Wohler succeeded in obtaining, urea from

• Cyanogen A
• Ammonium cyanate B
• Ammonium hydroxide C
• None of these D

Transition elements form which type of bond

• Ionic bonds only A
• Covalent bonds only B
• Ionic and covalent bonds C
• Polar bonds D

When alkyl is treated with chlorine in the presence of sunlight

• 1,3 dichloroproduct is formed A
• 1,4 dichloro product is formed B
• 1,3,5 trichloro product is formed C
• Only alkyl group is substituted D