ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Alkyle magnesium halides are known as

• Simon-smith reagent A
• Tollen's reagent B
• Grignard's reagent C
• Barford's reagent D

Atmosphere of big/metropolitan cities is polluted most by

• Automobile exhausts A
• Pesticide residue B
• Household waste C
• Radio-active fall out D

• 
  A
• 
  B
• 
  C
• 
  D

A process which takes place on its own without any outside assistance and moves from a non-equilibrium state towards an equilibrium state is termed as

• Spontaneous process A
• Natural process B
• Non-spontaneous process C
• Both a and b D

2SO₂+ O₂⇌2SO₂H= 188KJ mole^-1

Which statement about following equilibrium is correct :

• The value ofK_pfalls with arise in temperature.

  A

• The value ofK_pis equal tok_c.

  B

• The value ofK_pfalls with the increase pressure.

  C

• Adding V₂O₅catalyst increase the equilibrium yield of Sulphur trioxide.

  D

During reaction of O₂and alkenes, a product:

• Glycol A
• Epxide B
• Halohydrin C
• Ethylene glycol D

Which of the following does not reflect the periodicity of elements?

• Bonding behaviour A
• Electronegativity B
• Ionisation potential C
• Neutral/proton ratio D

Which statement is incorrect for and ideal solution

• The forces of attractions between solute and solvent molecules are same A
• There is no evolution or absorption of heat B
• Volume of the solution is less than sum of volumes of individual components C
• Vapour pressure of solution is directly proportional to the mole fraction of solvent D

For the carbylamine reaction we need hot alc.KOH and

• Any amin and chloroform A
• Chloroform and Ag powder B
• A primary amine and chloroform C
• A mono alkyl amine and trichlorom-ethane D

Which class of compound is more reactive

• Alkane A
• Alkene B
• Alkyne C
• None D

Benzene was discovered by first of all

• Michael Faraday A
• Hofmann B
• Ainderson C
• Sorenbon D

Bell metal is an alloy of Sn and

• Copper A
• Iron B
• Zinc C
• Magnesium D

The percentage by weight of NaCl, if 6.0 g of NaCl is dissolved in 120 g of water is

• 10.5 % A
• 5% B
• 8.02% C
• 11.5% D

Halogens are called

• Salt former A
• Light bearing B
• Copper forming C
• none of these D

Alkali metals have electrons in s-orbital:

• one A
• two B
• three C
• Four 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 formula represents the organic compound formed by the reaction of propanoic acid with methanol in the presence of concentrated sulphuric acid as a catalyst

• CH₃CH₂COCH₃ A
• CH₃CH₂CO₂CH₃ B
• CH₃CO₂CH₂CH₃ C
• CH₃CH₂CH₂CO₂CH₃ D

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

• H A
• Li⁺ B
• Na C
• He⁺ D

p-block elements belong to group

• I-A & II-A A
• III-A to VIII-A B
• I-B to X-B C
• Lanthanides D

The element caesium bears resemblance with

• Ca A
• Cr B
• Rubidium C
• None of the above D

Reaction of ethanes with KMnO₄ gives:

• Ozonide A
• Glyoxal B
• Glycol C
• Oxalic acid D

Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride

• The ionic radius of the NH₄⁺ion is similar to that of Mg²⁺but not that of Na⁺ A
• NH₄Cl dissociates less fully than NaCl B
• The ions Na⁺and Mg²⁺are isoelectronic (have the same number of electrons) C
• The ion NH⁺₄acts as an acid D

One of the following bonds is polar but compound is non-polar

• H₂O A
• NH₃ B
• HCl C
• CO₂ D

After chlorination, the pulp is washed at:

• 20°C A
• 30°C B
• 40°C C
• 60°C D

Grignard's reagent on treatment with chloramine give

• Acetamide A
• Primary amice B
• Secondary amice C
• Urea D

The formula of calcium superphosphate is

• CaHPO₄ A
• CaH₂PO₄ B
• Ca(H₂PO₄)₂ C
• None of these D

Newspaper can be recycled again and again by how many times?

• 2 A
• 3 B
• 4 C
• 5 D

Complete reduction of acids to alkanes is carried out with?

• Hydrogen iodide A
• Red phosphorous B
• Lithimum ammonium hydride C
• Both B and C D

Electronegativity values of the elements F, CI and Br vary

• F > CI > Br A
• Br > CI > F B
• Cl > Br > F C
• CI > F > Br D

Colour of chlorine is

• Pale yellow A
• Greenish yellow B
• Red brown C
• Greyish black D