ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Energy can neither be created nor destroyed, although it can be transformed from one form to another. This is a statement of

• Law of conservation of matter A
• Law of definite proportions B
• Law of conservation of energy C
• None of these D

The mineral CaSO₄.2H₂O has the general name

• gypsum A
• dolomite B
• calcite C
• epsom salt D

acetylene can be converted into-while passing through a Cu-tube at 300°C:

• Glyoxal A
• Vinyl acetylene B
• Vinyl alcohol C
• Benzene D

• 0.12 A
• 0.50 B
• 0.25 C
• 4.00 D

Which gasses are produced from landfills

• NH₃ A
• H₂S B
• N₂ C
• All of these D

Solutions containing relatively lower concentrations of solute are called :

• Concentrated solutions. A
• Lighter solutions. B
• Dilute solutions. C
• None of above. D

Vinegar is dilute solution of:

• Acitic acid A
• Formic acid B
• Butyric acid C
• Propionic acid D

The volume of 0.1 M H₂SO₄required to neutralize completely 40 ml of 0.2 M NaOH solution is

• 10 ml A
• 40 ml B
• 20 ml C
• 50 ml D

Homologues differ from each other by an integral number of

• CH₂groups A
• CH₃groups B
• CH groups C
• CH₄groups D

Kolb's method of alkanes production, is actually

• Hydrolysis A
• Catalysis B
• Electrolysis C
• Hydrogenation D

Which is a component of macronutrient?

• Zn A
• N B
• Mo C
• Cl D

A solution of glucose is 10% The volume to which 1g mole of it dissolved will be :

• 8.1 dm³
  A
• 1.7 dm³
  B
• 1.8 dm³
  C
• 6.1 dm³
  D

Refrectrometric method is used when

• Reactions involving absorption of I.R. or U. V A
• Reactions involving change of refractive index B
• Reactions involving ions C
• Change of optical activity D

Mustard gas is a

• Gas A
• High boiling speed B
• High melting liquid C
• Steam D

The destructive distillation of coal gives three products. What is not the product of destructive distillation of coal

• Coal gas A
• Carbon dioxide B
• Coal tar C
• Coke D

The shape of methanol, ammonia and water molecule can be explained by assuming

• Sp³ hybridization A
• Sp²hybridization B
• Sp hybridization C
• All of these D

According to Boyle's law, which parameters give a straight line parallel to axis-s, when we plot a graph between:

• V and T A
• P and V B
• P and 1/V C
• P and PV D

Solubility of a substance in water decreases with rise in temperature except

• CaCI₂. 6H₂O A
• Pb(NO₃)₂ B
• K₂Cr₂O₇ C
• Ce₂(SO₄)₃ D

Oxidation reduction is done by

• Oxidoreductase A
• Lipases B
• Lyase C
• None of these D

Which carbohydrates is an essential constituent of plant cells?

• Starch A
• Cellulose B
• Sucrose C
• Vitamins D

Polythene is a polymer of

• Ethane A
• Ethene B
• Acetone C
• Propylene D

A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is

• 46 A
• 78 B
• 110 C
• 180 D

The spectrum of He is expected to be similar to that of

• H A
• Na B
• He⁺ C
• Li⁺ D

Which are being formed by alkali metals?

• oxides A
• nitrides B
• carbides C
• peroxides D

• Br_2(aq) A
• 2, 4-dinitrophenylhydrazine B
• NaBH C
• Tollen's reagent D

Fatty acids are:

• Allphatic monocarboxylic acids A
• Dicaroxylic acids B
• Tricarboxylic acids C
• Tetracarboxylic acids D
• Poly carboxylic acids E

The base used in Cannizzaro's reaction is

• NaOH A
• KOH B
• CHI₃ C
• All of these D

Vital force theory was rejected by

• Berzellius A
• Kolbe B
• Wholer C
• Lavoiser D

Lower carboxylic acids are soluble in water due to

• Low molecular weight A
• Hydrogen bonding B
• Dissociation into ions C
• Easy hydrolysis D

The molecules of CO₂in dry ice from the

• Ionic crystalls A
• Covalent crystals B
• Molecular crystals C
• Any type of crystal D