ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Mendeleev was a scientist:

• Russioan A
• German B
• English C
• French D

The main pollutant of leather tanneries in the waste is due to the salt of:

• lead A
• Chromium (VI) B
• Copper C
• Chromium (III) D

• Zn A
• H B
• S C
• O 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

• Addition Elimination A
• Addition Reduction B
• Elimination Reduction C
• Substitution Elimination D

The heat contents of all the elements in their standard states are taken to be

• 1 A
• 2 B
• 0 C
• None D

Chile saltpetre has the chemical formule

• NaNO₃ A
• KNO₃ B
• Na₂B₄O₇ C
• Na₂CO₃.H₂O D

Which is a protein?

• Nylon A
• Rayon B
• Natural silk C
• Terylene D

When of the following is isolelectronic with krypton

• Ca⁺⁺ A
• Al⁺⁺⁺ B
• Br^-1 C
• I^-1 D

n-butane and iso butane are an example of

• Chain isomerism A
• Positional isomerism B
• Meta merism C
• Functional group isomerism D

When methane reacts with Cl₂in the presence of diffused light the products obtained are?

• Chloroform only A
• Carbon tetrachloride only B
• Chloromethane and dichloromethane C
• Mixture of a,b,c D

Which element does not belong to 3d transition series

• Ti A
• V B
• Mn C
• Te D

Photochemical smog is caused by

• CO A
• CO₂ B
• O₃ C
• NO₂ D

A compound is soluble in conc. H₂SO₄, it does not decolourise bromine in carbon tetrachloride but is oxidized by chromic anhydride in aqueous sulphuric acid within two seconds, turning orange solution to blue, green and then opaque. The original compound is

• Primary alcohol A
• Tertiary alcohol B
• alkene C
• ether D

Silicon atom is hybridized:

• sp A
• sp² B
• sp³ C
• dsp² D

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?

• Fullerences A
• Freons B
• Polyhalogens C
• Ferrocene D

Incomplete oxidation of alkanes yields

• CO₂& carbon black A
• CO₂+ heat B
• CO and carbon black C
• CO + heat 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

The number of paper industries in Pakistan are

• 30 A
• 25 B
• 35 C
• 20 D

Hydrolytic coversion of sucrose into glucose and fructose is known as

• Induction A
• Inversion B
• Insertion C
• Inhibition D

The four quantum numbers of the valency electron of potassium are

• 4,1,1,1/2 A
• 4,0,0,1/2 B
• 4,1,0,1/2 C
• 4,4,0,1/2 D

E = hv is the

• Spectral equation A
• Plank's equation B
• de Broglie's equation C
• None of these D

Matter is defined as any thing which occupies space and:

• Molecules A
• Mass B
• Compound C
• Molecules D

• Iodine can oxidise iron A
• Bromine can oxidise iron B
• Iodine can oxidise bromine C
• Iron can oxidise bromine D

A special application of the Hess's law to binary ionic compounds of M⁺X^-type in calculation of their lattice energies is

• Enthalpy of reaction A
• Born-haber cycle B
• First law of thermodynamics C
• Enthalpy of combustion D

Synthesis rubber is made by polymerization :

• Chloroform A
• Acetylene B
• Divinyl acetylene C
• Butene D

The number of electrons in the M shell of the element with atomic number 24 is

• 24 A
• 12 B
• 13 C
• 8 D

Out of all the elements of group V-A, the highest ionization energy is possessed by

• N A
• P B
• Sb C
• Bi D

Bleaching powder may be produced by passing chlorine over

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

Which property is not present in non-methals

• Predominantly covalent A
• Poor conductor B
• Hig E.N. value C
• High electropositivity D