ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The deviation of a gas from ideal behavior is maximum at :

• -10°C and 5.0 atm A
• -10°C and 2.0 atm B
• 100°C and 2.0 atm C
• 0°C and 2.0 atm D

C₆H₆Cl₆can be obtained from

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

A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step

• 
  A
• 
  B
• 
  C
• 
  D

The ratio of volume to temperature on Kelvin scale is constant according to

• Charle's law A
• Newton's law B
• Coulomb's law C
• Boyle's law D

Equal volumes of ethylene glycol (molar mass = 62) and water (molar mass = 18) are mixed. The depression in freezing point of water is (given K_rof water = 1.86 K mol^-1kg and specific gravity of ethylene glycol is 1.11)

• 0.003 A
• 3.33 B
• 0.333 C
• 33.3 D

• 0 dm³ A
• 3 dm³ B
• 2 dm³ C
• 3 dm³ D

The standard enthalpy change in the formation of 1 mole of a compound from its elements in their standard physical states is

• Enthalpy of formation A
• Enthalpy of atomization B
• Enthalpy of neutralization C
• Internal energy change D

A compound is soluble in conc. H₂SO₄, it does not decolourise bromine in carbon tetrachloride but is oxidized by chromic anhydride in aqueous sulphuric acid within two seconds, turning orange solution to blue, green and then opaque. The original compound is

• Primary alcohol A
• Tertiary alcohol B
• alkene C
• ether D

The molar value of CO₂ is maximum at :

• STP A
• 127°C and 1 atm B
• 0°C and 2 atm C
• 273°C and 2 atm D

Which of the following elements is not stable:

• Xe A
• Ar. B
• Kr. C
• Li. D

At sea level and at 100°C the vapor pressure of water in an open system is:

• 1000 mm Hg A
• 760 mm Hg B
• 730 mm Hg C
• 670 mm Hg D

When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give

• Benzene A
• Cyclohexene B
• Benzene C
• Toluene D

Which teat is not given by both glucose and fructose

• Give yellow ppt of CHl₃with alkaline aqueous iodine A
• With 2, 4-DNPH give yellow ppt of hydrazone B
• Evolve H₂gas with Na metal C
• Oxidised with [Ag(NH₃)₂]⁺i.e. Tollen's reagent D

Which of the sub-atomic particles is not charged

• Electron A
• Proton B
• Neutron C
• All of them D

Buffers having pH less than 7 are made

• Mixture of weak acid + salt of it with strong base A
• Mixture of weak acid + salt of it with weak base B
• Mixture of weak base + salt of it with strong acid C
• Mixture of weak base + salt of it with weak base D

Write the name of following compound

• 5 - methyle - 2- hexene A
• 2 - methyle hexene B
• 4 - ethyle - 2 - methyle hexene C
• 3 - ethyle - 3 - methyl hexene D

• Zero A
• 1 B
• 2 C
• 1.5 D

Which of the following species is paramagnetic?

• CO₂ A
• NO B
• O^2- C
• CN D

Catalyst in the reaction ROH + SOCl₂-------> RCL+SO₂+HCl is:

• ZnCl₂ A
• Pyridine B
• H₂SO₄ C
• Either D

The Zwitter ion is also called

• International salt A
• Internal salt B
• No salt C
• None of these D

Which of the following statements is not correct regarding bonding molecular orbitals?

• Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed A
• Bonding molecular orbitals have low electron density between the two nuclei B
• Every electron in the bonding molecular orbitals contributes to the attraction between atoms C
• Bonding molecular orbitals are formed when the electron waves undergo constructive interference D

Which gas is used for welding purposes

• Butane A
• Nitrogen B
• Methane C
• Acetylene D

In the presence of copper electrodes the electrolysis of aqueous CuSO₄produces at cathode

• H₂gas A
• O₂gas B
• SO₂gas C
• Cu metal D

The amount of Si in the lithosphere is about

• 27.72% A
• 30.35% B
• 35.30% C
• 40.21% D

The standard EMF of Daniel cell is 1.10 volt. The maximum electrical work obtained from the Daniel cell is

• 212.3 kJ A
• 175.4 kJ B
• 106.15 kJ C
• 53.07 kJ D

• 3 A
• 4 B
• 5 C
• 2 D

The number of elements in the 4th periods of periodic table is

• 8 A
• 10 B
• 18 C
• 32 D

Hydrolysis of Grignard's reagent gives:

• Alcohol A
• Halide B
• Alkyl C
• Alkane D

The effective activity of a metal catalyst is increased if it is in

• Solid form A
• Liquid state B
• Gaseous state C
• Finely divided form D

SO₃ is not absorbed in water directly to or H₂SO₄ because

• the reaction does not go to completion. A
• the reaction is quite slow. B
• the reaction is exothermic. C
• SO₃ is insoluble in water. D