ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following species is paramagnetic?

• CO₂ A
• NO B
• O^2- C
• CN D

A buffer solution of 0.1 molar HCOOH and 0.1 molar HCCONa has pH = 3.78 To is 0.01 molar HCl is added, then pH of the buffer solution becomes

• 2.78 A
• 4.78 B
• 3.78 C
• 3.70 D

Which of the following compounds on oxidation gives benzoic acid?

• Chlorophenol A
• Chlorotoluene B
• Chlorobenzene C
• Benzyl chloride D

Dipole moment of CO molecule is:

• 0.0 A
• 1.112 D B
• 0.112 D C
• 2.112 D D

Corrosion reaction are

• Spontaneous redox reaction A
• Non-spontaneous acid-base reactions B
• Spontaneous acid-base reactions C
• None of these D

Self linkage of carbon to produce long chains

• isomerism A
• Polymorphism B
• Polymerization C
• Catenation D

Chromium (VI) is highly toxic and can cause

• Blindness A
• Cancer B
• Liver problems C
• Blood problems D

Which of the following solution have zero pH

• 1 M HCI A
• MH₂SO₄ B
• 0.1 M HNO₃ C
• 1 M CH₃COOH D

Units of Kw are

• Mole dm^-3 A
• Mole²dm^-3 B
• Mole²dm^-6 C
• Mole²dm^-3 D

In ter-butyl alcohol, the tertiary carbon is bonded to

• Two hydrogen atoms A
• Three hydrogen atoms B
• One hydrogen atoms C
• No hydrogen atom D

Which one of the following has highest density

• Zn A
• Os B
• Ni C
• Cu D

In the chemical combination of hydrogen and fluorine to form HF:

• Sodium atom donates major share of its electrons. A
• Hydrogen atom donates the major share of its electrons. B
• Both the atoms share the electrons equally. C
• None of above. D

A salt producing hydrocarbon among these compounds is

• Ehyne A
• Ethene B
• Methane C
• Ethane D

Chloroform and acetone are soluble in each other due to:

• Instantaneous dipole interactions. A
• Dipole-dipole interactions. B
• Inter molecular hydrogen bonding. C
• All of above D

Calorie is equivalent to

• 0.4184 J A
• 41.84 J B
• 4.184 J C
• 418.4 J D

Periodic law was given by:

• Al-Razi A
• Dobriener B
• Newland C
• Mendeleev D

Which noble gas is used in mixture used for breathing by divers?

• Cl₂ A
• NH₃ B
• CO₂ C
• He D

Ethyl alcohol may be identified by

• Ring test A
• Iodoform test B
• Tollen's test C
• Bazeyer's test D

Acetic acid is manufactured by the fermentation of

• Ethanol A
• Methanol B
• Ethanal C
• Methanal D

The energy units in which heat changes usually expressed in SI-system are

• Joule A
• Calorie B
• Kilo Joule C
• Both a and c D

When the degree of freedom increase the entropy ______

• Decreases A
• Increases B
• Remains same C
• All D

When a metal is dipped in 1 molar of its solution at 298 K. then potential set up is called

• Standard electrode potential A
• Electric charge B
• Ionization potential C
• Electroplating D

All the elements belongs to the 2nd period are

• Normal elements A
• Transition elements B
• Stable elements C
• Halogens D

Detergents are

• Synthetic products A
• Natural products B
• Both (a) and (b) C
• None of these D

An electric current is passed through silver voltameter connected to a water voltmeter. The cathode of the silver voltameter is 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is

• 56 cm³ A
• 550 cm³ B
• 5.6 cm³ C
• 11.2 cm³ D

The lA elements are called

• Alkaline earth metal A
• Alkaline metals B
• The halogens C
• The inert gases D

HF has exceptionally low acidic strength due to:

• Smaller size of fluorine. A
• Stronger polar bond between H and F. B
• Electronegativity of fluorine C
• Strong hydrogen bonding D

Ratio of carbon to hydrogen in aromatic compounds is:

• Low than alkanes A
• High than alkanes B
• Low than alkanes not high than alkanes C
• High than alkanes D

• 450°C A
• 250°C B
• 850°C C
• 1000°C D

Ethyl acetate reacts with CH₃MgBr to form

• Secondary alcohol A
• Tertiary alcohol B
• Primary alcohol and acid C
• Acid D