ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

Milk of lime is

• MgO A
• CaO B
• Ca(OH)₂ C
• Mg(OH)₂ D

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will bot cause water pollution

• Live stock waste A
• Agricultural pesticides B
• Oil breaks and spills C
• All of the above D

Which of the following is directly related with entropy

• Pressure A
• Degree of freedom B
• Temperature C
• Both b and c D

Two solutions of NaCl and KCl are prepared separately by dissolving 0.1 M of the solute in water. Which of the following statements is not true for these solution

• KCl solution will have higher boiling point than NaCl solution A
• Both the solutions have same boiling B
• KCl and NaCl solution possess same vapour pressure C
• KCl solution possess same freezing point at NaCl solution D

Clemensen's reduction of ketones is carried out in

• H₂with Pd catalyst A
• Glycol with KOH B
• LiAIH₄in water C
• Zn-Hg with conc. HCl D

Francium is an element at the bottom of Group I in the Periodic Table. Which one of the following predication is likely to be correct?

• It will react with water to liberate oxygen A
• Its hydroxide will be a strong alkali in water B
• Its carbonate will decompose on heating to give carbon dioxide C
• Its nitrate on heating will give nitrogen dioxide and oxygen D

DDT is

• Biodegradable pollutant A
• Nondegradable pollutant B
• Not a pollutant C
• An antibiotic D

Extent to H₂ + L₂ à2Hl can be increased by :

• Increasing temperature.

  A

• Increasing product.

  B

• Increasing pressure.

  C

• Adding a catalyst.

  D

B-atom in BF₃has

• sp³hybridization A
• sp²hybridization B
• sp hybridization C
• no hybridization D

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

• 1 A
• 2 B
• 3 C
• 4 D

The nature of positive ray depend on:

• The nature of electrode. A
• The nature of discharge tube. B
• The nature of residual gas. C
• All of above. D

The reaction-method that does not give an alkane is

• Catalytic hydrogenation of alkanes A
• Wurtz reaction B
• Hydrolysis of alkyl magnesium bromide C
• Dehydrohalogenation of an alkyl halide D

Identify the hydrocarbon formed, when ethyl bromide reacts with, alcoholic KOH at 100°

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

With increases in temperature of 10 K of the reacting gases the rate of reaction is doubled because

• Increase in number of collisions A
• Number of molecules having energy more than Ea is doubled B
• Increase in order of reaction C
• Increase in surface area D

When the solute is present in trace quantities the following expression is used

• Gram per million A
• Milligram percent B
• Microgram percent C
• Parts per million D

An oil or fat with no double bond have iodine number:

• Zero A
• 100% B
• 50% C
• minimum D

Which has sweetish taste?

• N₂O A
• NH₃ B
• Cl₂ C
• CO₂ D

Which one of the following gases is used for artificial ripening of fruits

• Ethane A
• Ethyne B
• Methane C
• Propane D

Purines include

• Adenine A
• Guanine B
• Both a and b C
• None D

1-Chlorobutane on reaction with alcoholic potash gives

• But 1-ene A
• Butan-1-ol B
• But-2-ene C
• Butan-2-ol D

Alkali metals in each period have

• Smallest size A
• Lowest IE B
• Highest IE C
• Highest electronegativity D

Ozonolysis of benzene gives:

• Nitration A
• sulphonation B
• ozonide C
• glyoxal D

The reaction of aromatic acyl chloride and phenol in the presence of a base NaOH or pyridine is called

• Kolbe's reaction A
• Perkin's reaction B
• Sandmeyer's reaction C
• Schotten Baumann reaction D

Benzene is obtained from benzene sulphonic acid by treating with

• HCl A
• NaOH B
• H₂O C
• NaHCO₃ D

Series starting form ₃₉Y to ₄₈CD is in period:

• 4th A
• 5th B
• 6th C
• 7th D

• Zero A
• 253 sec B
• 150 sec C
• 500 sec D

Carbonates of alkali metals dissolves freely in water to form

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

Amongst the following the compound that can be most readily sulphonated is

• Toluene A
• Benzene B
• Nitrobenzene C
• Chlorobenzene D

Which one of the following is a water soluble vitamin

• D A
• K B
• A C
• Ascorbic acid (Vic C) D