ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

• 3 A
• 2 B
• 1 C
• 0 D

75% plant nutrients are present in the fertilizer

• urea A
• NH₄NO₃ B
• NH₃ C
• (NH₄)₂HPO₄ D

In a group the atomic size increase downward due to

• Addition of electronic shells A
• Increase in the proton number B
• Repulsion of electrons C
• All of the above D

Each vertical column of the periodic table includes elements with chemical characteristics that are in general

• Identical A
• Similar B
• Different C
• Similar as well as different D

Which of the following compounds on oxidation gives benzoic acid?

• Chlorophenol A
• Chlorotoluene B
• Chlorobenzene C
• Benzyl chloride D

Which of the following nitrogen fertilizer contains more nitrogen

• NaNO₃ A
• KNO₃ B
• NH₄NO₃ C
• Urea D

Which is the most reactive?

• White phosphorus A
• Red Phosphorus B
• Graphite C
• Plastic sulphur D

Best medhod of preparation of alkyl halide from alcohals is by its reaction with:

• HX A
• SOCl₂ B
• Px₅ and PX₃ C
• All D

Law of mass action was given by :

• Guldberg and Waage. A
• Berkeley and Hartly. B
• Ramsay and Reyleigh. C
• Berthelot. 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

Number of elements in the first period of the periodic table are

• Two A
• Four B
• One C
• Eight D

The process in which orbitals of different energies and shapes mix with each other to give equivalent hybrid orbitals is called

• Isomerization A
• polymerization B
• Hybridization C
• Resonance D

Which of the following compound is obtained on passing ethanol vapours on heated Al₂O₃?

• Ethylether A
• Acetone B
• Ethane C
• Ethanol D

Selection of filter paper depends upon sizes of particles to be:

• Tested A
• ^Filtered B
• Checked C
• All of above D

When no work is done by the system

• The volume of system decreases A
• The volume of system increases B
• The volume of system does not change C
• None of above D

Which is used in arc welding and cutting?

• He A
• Ne B
• Ar C
• Kr D

The volume occupied by 1.4 g of N₂ at S.T.P is

• 2.24 dm³ A
• 22.4 dm³ B
• 1.12 dm³ C
• 112 cm³ D

The percentage of H is the highest in

• CH₄ A
• NH₃ B
• H₂SO₄ C
• C₆H₁₂O₆ D

Aldehydes is distinguished from ketones by using

• Tollen's reagent A
• Benedict reagent B
• Fehling solution C
• All of the above D

Neutralization of a strong acid with a strong abase is:

• Natural acid base reaction. A
• Artificial acid base reaction. B
• Spontaneous acid base reaction. C
• Both (a) and (c). D

Aldehydes are oxidizes are to give:

• Primary alcohol A
• Sec-alcohol B
• Ter-alcohol C
• Carboxylic acid D

Which statement about the following equilibrium in correct?

2SO_{2 (g)}+ O_2(g)---------------2sO_3(g)H= - 188.3 KJ mol-1

• T value of K_{p falls witha rise in temperate.} A
• The value of K_{p falls withincreasing pressure}
  B
• Adding V_2O5catalyst increase the equilibrium yield of sulfur trioxide
  C
• The value of K_{p is equal to}K_p D
• 
  
  E

Maximum hydrogen bonds in water are

• 4 A
• 3 B
• 2 C
• 8 D

Which of the following (1 M) conducts more electricity?

• Sulphuric acid A
• Boric acid B
• Nitric acid C
• Phosphorus acid D

In the expression rate = K [A]^a[B]^bK is

• The order of reaction A
• The speed of reaction B
• The specific rate constant C
• The overall order of reaction D

Ammonium carbonate when heated to 200°C gives a mixture of NH₃and CO₂vapour with a density of 13.0. What is the degree of dissociation of ammonia carbonate?

• 3/2 A
• 1/2 B
• 2 C
• 1 D

The overlapping of two partially filled atomic orbital is in such a way that the probability of finding the electron pair is maximum along the axis joining the two nuclei, the bond is

• Sigma bond A
• Pi bond B
• Ionic bond C
• Non-polar bond D

The number of moles of CO2which contain 8.0 g of oxygen

• 0.25 A
• 0.50 B
• 1.0 C
• 1.50 D

The normal amount of overhead ozone is about

• 250 Du A
• 300 DU B
• 350 DU C
• 400 DU D

• 84.84 % A
• 89.89% B
• 81.81% C
• 90.90% D