ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its

• Electron affinity A
• Electronegativity B
• Ionisation energy C
• Valency D

Misch mental is

• An alloy of Aluminium A
• A mixture of chromium and lead chromate B
• An alloy of lanthanoid metals C
• An alloy of copper D

Synthetic rubber is made by polymerization of

• Chloroform A
• Acetylene B
• Divinlacetylene C
• Butene D

Which of the following is weakly acidic in nature

• Alcohol A
• Phenol B
• Aidehyde C
• Amide D

In incinerating the waste is burnt at

• 1000°C A
• 100°C B
• 2000°C C
• 1500°C D

Williamson's synthesis is used to prepare

• Diethylether A
• Phenolphthalein B
• Hydrogenation C
• Bakelite D

Most hazardous metal pollutant of automobile exhaust is

• Mercury A
• Lead B
• Cadmium C
• Copper D

Which orbital is in the process of completion in case of transition elements

• p-orbital A
• f-orbital B
• d-orbital C
• s-orbital D

The method involved for electrolysis of Na or K salts of carboxylic acids

• Sabatier's sendrens reaction A
• Kolbe's method B
• Clemmensen C
• Wolf kishner reduction D

Baukelite is a polymer obtained from two monomers

• Phenol and ethanol A
• Phenol and methanol B
• Phenol and methanal C
• Phenol and acetone D

Bone ash contains calcium phosphate

• 70% A
• 80% B
• 90% C
• 100% D

One kilocalrie is equal to

• 4.184 x 10³J A
• 4.184 x 10⁴J B
• 4.184 x 10²J C
• None of these D

Same amount of electric current is passed through solutions of AgNO₃and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated as S.T.P in the second case is

• 112 cm³ A
• 22400 cm³ B
• 224 cm³ C
• 1.008 g D

• Shift reaction toward forward direction A
• Shift reaction backward B
• Lower the value of K_c C
• No change in reaction D

The % of CO₂is the atmosphere is

• 3.0% A
• 0.03% B
• 0.3% C
• 0.5% D

• Plank's equations A
• de Broglie's equations B
• Heisenburg's equation C
• None D

Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as

• Environment A
• Hydrosphere B
• Pollutant C
• Biosphere D

LiOH ______ soluble than NaOH

• More soluble A
• Less soluble B
• Equally soluble C
• None 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

Which gas is used for welding purposes

• Butane A
• Nitrogen B
• Methane C
• Acetylene D

Ozone depletion in stratosphere shall result in

• Forest fires A
• Increased incidence of skin cancer B
• Global warming C
• None of the above D

The characteristic reactions of alkanes are

• Addition reactions A
• Substitution reactions B
• Condensation reactions C
• Polymerization reactions D

Aromatic hydrocarbons are the derivatives of:

• Normal series of parrafins A
• Alkene B
• Benzene C
• Cyclohexane D

Which of the following salt is used as purgative

• CaSO₄ A
• MgSO₄ B
• BeSO₄ C
• NaCl D

Which is plaster of paris?

• CaSO₄.H₂O A
• (CaSO₄)₂.H₂O B
• CaSO₄.2H₂O C
• CaSO₄.3H₂O D

3.01 x 10²²Ag⁺ions is present in

• 85 grams AgNO₃ A
• 0.85 g AgNO₃ B
• 8.5 g AgNO₃ C
• 18.5 g AgNO₃ D

The wave length of visible light is 500 nm. In S.I. unit this value is

• 5 x 10^-8m A
• 5 x 10^-9m B
• 500 x 10^-7m C
• 500 x 10^-9m D

The pH range of the acid rain is

• 8 - 7 A
• 7 - 6.5 B
• 6.5 - 6 C
• Less than 5 D

The number of unpaired electrons in the p-subshell of oxygen atom

• 1 A
• 2 B
• 3 C
• 4 D

The melting point is lowest for

• Be A
• Mg B
• Ca C
• Sr D