ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Nitrogen in the atmosphere is:

• 78% A
• 21% B
• 0.9% C
• 0.03% D

Acylation of benzene to produce aliphatic aromatic ketones is known as:

• Friedel Craft's reaction A
• Benzene condensation B
• Hydroformylation C
• Cellemense
  D

Ethanol is prepared in Pakistan form fermentation of:

• Starch A
• Sugar B
• Glucose C
• Molasses 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

• Electrophilic addition A
• Electrophilic substitution B
• Free radical substitution C
• Nuclophilic addition D

Which reaction yields Bakelite?

• Urea with HCHO A
• Tetramethyl glycol with Hezamethylene diisocyanate B
• Phenol and HCHO C
• Ethylene glycol and Dimethylterephthalate D

Which of the following has greatest tendency to lose electron?

• F A
• Fr B
• S C
• Be D

For a gas obeying Boyle's law if pressure is doubled, the volume becomes :

• Remain constant A
• Double B
• One half C
• None of above D

Which of the following element is most reactive

• Li A
• Na B
• K C
• Cs D

Transition metals mostly are

• Diamagnetic A
• Paramagnetic B
• Neither diamagnetic nor paramagnetic C
• Both diamagnetic and paramagnetic D

In the particular reaction for the valueK_{c 1 x}10^-25which statement is correct :

• Almost forward reaction is completed. A
• Amount of reactant is negligible as compared to product. B
• Amount of product is negligible as compared to reactant. C
• Amount of product is equal to amount of reactant. D

The major components of coal gas are

• Hydrogen and methane A
• Ethane and carbon monoxide B
• Nitrogen and ethane C
• Ethane and carbon dioxide D

HF has exceptionally low acidic strengths due to

• Smaller size of fluorine A
• Strong polar bond between H and F B
• Electronegativity of fluorine C
• Strong hydrogen bonding D

Iodine value of an oil or fat may be defined as

• The number of grams of iodine taken up by 1 g of the oil or fat A
• The number of grams of iodine taken by 10 g of the oil or fat B
• The number of grams of iodine taken by 100 g of the oil or fat C
• None of the above D

Ascorbic acid is a chemical name of

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

Sodium thisoulophate is used in photography because of its

• Oxidizing behaviour A
• Reducing behaviour B
• Complexing behaviour C
• Photochemical behaviour D

Which reagent could be used to distinguish between CH₃CH(OH)CH₂CHO and CH₃COCH₂CH₂OH

• Acidified potassium dichromate A
• Dilute sulphuric acid B
• 2,4-dinitrophenylydrazine C
• Fehling's reagent D

The 95.5% mass of Lithosphone is made of 11 elements i.e. O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. which element is present in trace amount

• Iodine A
• Bromine B
• Lead C
• Carbon D

• Condensation A
• Dehydration B
• Dehydrogenation C
• Hydrogenation D

All alkali metals react with acetylene to form acetylides except:

• Li A
• Na B
• K C
• Rb D

One mole of C₂H₅OH contains the number of H-atoms

• 6.02 x 10²³ A
• 3.61 x 10²⁴ B
• 1.81 x 10²⁴ C
• 6.02 x 10²⁴ D

Which is volatile liquid?

• HF A
• HCl B
• HBr C
• Hl D

Al³⁺is a symbol for aluminium

• Atom A
• Ion B
• Cation C
• Anion D

The solubility of KCIO₃salt in water is decreased by adding

• NaCIO₃ A
• NaCI B
• KCIO₄ C
• KCI D

London dispersion forces are also called

• Hydrogen bonding A
• Debye forces B
• Van de Waal's forces C
• Instantaneous dipole-induced dipole forces D

A property which differs fluorine from the other halogens?

• Direct combination with inert gases A
• Uninegative B
• Diatomic C
• ns² , np⁵ D

Each of the following is true of white and red phosphours except that they

• Are both soluble in CS₂ A
• Can be oxidized by heating in air B
• Consist of the same kind of atoms C
• Can be converted into one another D

A reaction is reversible because :

• Products are stable. A
• Reactants are reactive. B
• Products are reactive. C
• Reactants re stable. D

What is the nature of Al₂O₃

• Acidic A
• Basic B
• Amphoteric C
• Neutral D

Which of the following compounds will not react with sodium metal to release hydrogen

• CH₃CH₂CH₃ A
• CH₃CH₂OH B
• C₆H₅OH C
• C₆H₅CH₂OH D