ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

• Chlorination, nitration, reducing A
• Nitration, chlorination, reducition B
• Nitration, reduction,chlorination C
• Nitration, reduction, acylation, chlorination, hydrolysis D

On adding sodium nitroprusside ketones give

• Red A
• Wine red B
• White C
• Orange D

When benzene is burnt in free supply of air, it is completely oxidized to

• CO A
• CO₂₊H₂O B
• H₂CO₃ C
• None D

Elimination bimolecular reactions usually obey

• First order kinetics A
• Second order kinetics B
• Third order kinetics C
• Zero order kinetics D

Which of the following substances is used as an antiknock compound?

• Tetraethyl lead A
• Lead tetrachloride B
• Lead acetate C
• Ethyle acetate D

95% ethanol is called:

• Rectified other A
• Diesel B
• Rectified spirit C
• Petrol D

Vinyl acetylene combines with HCI to form

• Poly acetylene A
• Benzene B
• Chloroprene C
• Divinylacetylene D

Boiling point of n-butane is:

• -102°C A
• -75°C B
• -55°C C
• 55°C D

Rutherford's model of atom failed because:

• The atom did o have a nucleus and electrons A
• It did not account fro the attraction b/w protons and neutrons B
• It did no account for the stability of the atom. C
• There is actually no space b/w the nucleus ad the electrons. D

The concentration units independent of temperature would be

• Normality A
• Mass-volume precent B
• Molality C
• Molarity D

Which for the following has no dipole moment

• HCI A
• H₂S B
• H₂O C
• CO₂ D

Of the following four reactions, formic acid and acetic acid differ in which respect?

• Replacement of hydrogen by sodium A
• Formation of ester with alcohol B
• Reduction of Fehling solution C
• Blue litmus reaction D

• RCH(CH₃)CO₂H + CH₃OH A
• RCH(CH₃)CO₂H + HCO₂H B
• RCH(CH₃)OH + CO₂ C
• RCH(CH₃)OH + HCO₂H D

The rate determining step is the :

• Slowest step. A
• Fastest step. B
• Moderate step. C
• Both (a) and (b). D

When a piece of zinc is added to the copper sulphate solution, _______ colour of solution disappear

• Pink A
• Purple B
• Blue C
• Brown D

Which causes water pollution?

• Smoke/fly ash A
• Automobile exhausts B
• Aeroplnes C
• 2,4-D and pesticides D

The value of K_pis greater than K_cfor a gaseous reaction when

• Number of molecules of products is greater than the reactants A
• Number of molecules of reactants is greater than those of products B
• Number of molecules of reactants and products equal C
• Catalyst is added D

Among the following the most reactive towards alcoholic KOH is

• CH₂= CHBr A
• CH₃COCH₂CH₂Br B
• CH₃CH₂Br C
• CH₃CH₂CH₂Br D

Half life period of astatine is

• 8.1 hrs A
• 8.2 Hrs B
• 8.3 hrs C
• 8.4 hrs D

Simple sugars are :

• Monosacchrides A
• Disaccharides B
• Oligo saccharides C
• Trisaccharides D

the oxides of beryllium are:

• acidic A
• basic B
• amphoteric C
• None of these D

A set of compounds in which reactivity of halogen atom in the ascending order is

• Chlorobenzene, vinyl chloride, chloroethane A
• Chloroethane, chlorobenzene, vinyl chloride B
• Vinyl chloride,chlorobenzene chloroethane C
• Vinyl chloride, chloroethane,chlorobenzene D

Reaction of ethanes with KMnO₄ gives:

• Ozonide A
• Glyoxal B
• Glycol C
• Oxalic acid D

When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is

• Zero A
• First B
• Second C
• Third D

Phosphine is not obtained by the reaction when

• White P is heated with NaOH A
• Red P is heated with NaOH B
• Ca₂P₂reacts with water C
• PH₄l is boiled with water D

Bell metal is an alloy of

• Cu, Zn, and Sn A
• Cu, Zn and Ni B
• Cu and Zn C
• Cu and Sn D

Content is a combination of mainly:

• Calcarious A
• Argillaceous B
• Calcarious and argillaceous C
• Al₂O₃ D

The optimum conditions of temperature and pressure to get maximum NH₃form N₂and H₂gases is

• 2000°C and 10 atmosphere A
• 0°C and 1 atmosphere B
• 400°C and 200-300 atmosphere C
• 200°C and 100 atmosphere D

Which statement is incorrect for balancing of redox reactions by ion-electron method

• The reaction is splitted into two half reactions A
• H₂O and H⁺ions are added for acidic or neutral reaction to balance O and H atoms B
• To balance H, HCi, is added C
• To balance O and H in the alkaline reaction OH^-added D

Carbonates of alkali metals dissolves freely in water to form

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