ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The oxides of beryllium are

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

Which phosphorus is the most poisonous?

• White A
• Red B
• Black C
• All D

BOD is

• Biological oxygen deficit A
• Biosphere oxygen demand B
• Biological oxygen demand C
• None of the above D

• Pent -1-ene-3-yne A
• 2-pentyne-4-ene B
• 1-pentene-3-yne C
• Pent-2-yen-4-ene D

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

• H A
• Na B
• He⁺ C
• Li⁺ D

Ammonium nitrate fertilizers is not used for which crop?

• Cotton A
• Wheat B
• Sugar-cane C
• Paddy rice D

C₆H₆Cl₆can be obtained from

• HCl and Benzene A
• Cl₂and Benzene and AlCl₃ B
• Cl₂and Benzene in diffused light C
• NaOCl and Benzene D

The chemical method used for determination of rate of reaction is

• Spectroscopic A
• Conductiometric B
• Refractometric C
• Titration D

Which is a good nucleophile?

• F^-1 A
• Cl^-1 B
• Be^-1 C
• I^-1 D

How many molecules of chlorine adds in benzene in the presence of sunlight

• One A
• Two B
• Three C
• Four D

At present cement plants in Pakistan are

• ten A
• twenty two B
• four C
• twenty four D

The order of reactivity of halogen acids towards alkenes

• HCl > HBr > Hl A
• HBr > HCl > HI B
• HCl > HBr C
• HI > HBr > HCl D

After chlorination, the pulp is washed at

• 20°C A
• 30°C B
• 40°C C
• 60°C D

Drawback DDT as presticide is

• I becomes ineffective after some time A
• It is less effective than others B
• It is not easily/rapidly degraded in nature C
• Its high cost D

The example of colligative property is

• Boiling point A
• Osmosis B
• Freezing point C
• Osmotic pressure D

The paper is derived from the name of which seedy plant?

• Rose A
• Sun flower B
• Papyrus C
• Water Hyacinth D

Hydrocarbons contain

• C and S only A
• C and H only B
• C, H, and O only C
• C, H, O and N only D

Dobereiner gave his law in the year:

• 1829 A
• 1864 B
• 1871 C
• 1931 D

E₁mechanism is generally shown by

• 1° - RX A
• 2° - RX B
• 3° - RX C
• None of these D

Bronze is an alloy of Cu and

• Zn A
• As B
• Sb C
• Sn D

Plaster of pares is obtained by heating

• Gypsum A
• Epsom B
• Lime stone C
• Dolomite D

At constant temperature when pressure of a gas is plotted against volume, the curve is

• Slanting straight line A
• Parabolic B
• Staight line, parallel to pressure axis C
• OF neither type D

A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

• 10 A
• 50 B
• 30 C
• 96.5 D

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

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

A one thousand dm³sample of water contains one gram of iron (iii) ions what is the concentration in parts per million of Fe^3f(eq) in parts per million

• 0.001 A
• 0.01 B
• 0.1 C
• 1.0 D

In electrolysis of NaCl when Pt electrode is taken then H₂is liberated at cathode while with Hg cathode it forms sodium amalgam

• Hg is more inert than Pt A
• More voltage is required to deduce H⁺at Hg than Pt B
• Na is dissolved in Hg while it does not dissolve in Pt C
• Conc. of H⁺ions is larger when Pt electrode is taken 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

N-atom forms three covalent bonds, its electronic configuration is

• 
  A
• 
  B
• 
  C
• 
  D

Ascorbic acid is a chemical name of

• Vitamin D A
• Vitamin A B
• Vitamin C C
• Vitamin B₆ D

Chile saltpetre has the chemical formule

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