ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which element belong to 5d series

• V A
• Nb B
• Pd C
• Hf D

Preparation of vegetable ghee involves

• Halogenations A
• Hydrogenation B
• Hydroxylation C
• Dehydrogenation D

Maximum number of active hydrogens are present in

• Acetic acid A
• Glycerol B
• Methane C
• Methanol D

• 
  A
• 
  B
• 
  C
• 
  D

The human body can synthesize ______ amino acids

• 1 A
• 10 B
• 20 C
• 19 D

Which metal of Group-II A of the periodic Table, will form the least ionic chloride

• Be A
• Mg B
• Ca C
• Sr D

Meta directing group decreased the ----------- of benzene ring

• Physical activity A
• Chemical reactivity B
• Density C
• None D

According to Mendeleev, the properties of the elements are periodic function of their

• Atomic number A
• Atomic volumes B
• Atomic masses C
• Atomic densities D

Tryosine was isolated from

• Butter A
• Cheese B
• Oils C
• Fats D

• Treatment with HCN followed by acid hydrolysis A
• Oxidation of acetaldehyde followed by basic hydrolysis B
• Treatment with HCN followed by reduction C
• Treatment with HCN followed by oxidation D

Potassium ferrocyanide is a

• Mixed salt A
• Double salt B
• Complex salt C
• Normal salt D

• 450°C A
• 250°C B
• 850°C C
• 1000°C D

Hybridized in oxygen is:

• sp A
• sp² B
• sp³ C
• dsp³ D

The degree of unsaturation in fats or oils is usually measured by numbers of grams of iodine required by 100 grmas of fat, this is called

• Oil number A
• Saturation number B
• Iodine number C
• Un saturation number D

• 
  A
• 
  B
• 
  C
• 
  D

Water shows maximum density at

• 4°C A
• 0°C B
• 100°C C
• -4°C D

The rigid rocket part of earth crust called lithosphere extends upto a depth of:

• 10 km A
• 100 km B
• 1000 km C
• 1500 km D

Mendeleev gave his periodic law in the year:

• 1829 A
• 1864 B
• 1871 C
• 1913 D

If ionic product of a solution is greater than solubility product, the solution is

• Supersaturated A
• Saturated B
• Unsaturated C
• None of these D

Reation of which with Grignard's reagent gives primary alcohol:

• Formaldehyde A
• Aldehyde B
• Ketones C
• Acetone D

Calcium carbonate contains oxygen in it

• 48% A
• 50% B
• 53% C
• 60% D

Most common oxidation states shownby cerium are

• +2, +4 A
• +3, +4 B
• +3, +5 C
• +2, +3 D

SN₂ reaction has order of reaction :

• First A
• Second B
• Third C
• Zero D

When 3p orbital is complete, the entering electron goes into

• 4s A
• 3d B
• 4p C
• 4f D

Cuprous ore among the following is

• Chalcopyites A
• Azurite B
• Cuprite C
• Malachitre D

A buffer solution of 0.1 molar HCOOH and 0.1 molar HCCONa has pH = 3.78 To is 0.01 molar HCl is added, then pH of the buffer solution becomes

• 2.78 A
• 4.78 B
• 3.78 C
• 3.70 D

Oxidation state of boron, aluminium and gallium is:

• +1 A
• +2 B
• +3 C
• +5 D

Diethyl ether is obtained by Williamsons synthesis using

• Ethanol + Na + C₂H₅Br A
• Ethanol + Mg + C₂H₅Br B
• Methanol + Na + CH₃Br C
• Methanol + Mg + CH₃Br D

• Decrease in temperature favour more dissolution of the salt A
• Increase in temperature favour more dissolution of the salt B
• Lowering pressure favour more dissolution of the salt C
• Increasing pressure favour more dissolution of the salt D

A six membered ring containing one double bond called

• Cyclohexene A
• Cyclohexane B
• Cyclohexadiene C
• None D