ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Ammonium nitrate fertilizer is not used for which crop?

• Cotton A
• Wheat B
• Sugar-cane C
• Paddy rice D

Gases exert pressure on walls of container because the gas molecules :

• Obey gas laws. A
• Have definite volume. B
• Collide with the walls of container. C
• Collide with each other. D

Products of coal is:

• Peat A
• Lignite B
• Bituminous coal C
• All above D

Basicity of orthoposphoric acid is

• 2 A
• 3 B
• 4 C
• 5 D

The electronegativeities of F,Cl,Br and I are 4.0,3.0,2.8,2.5 respectively.Hydrogen halide with a high percentage of ionic character is

• HF A
• HCL B
• HBr C
• HI D

Coupling of Pb with its Pb⁺⁺/Pb = -0.13 V and Ag with Ag⁺/ Ag = +0.80 V, the cell reaction

• 
  A
• 
  B
• 
  C
• 
  D

When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then

• Reaction becomes exothermic A
• Energy of activation is different B
• Mechanism of reaction is changed C
• Half life period is changed D

The benzene molecule contains

• Three double bonds A
• Two double bonds B
• One double bonds C
• Delocalizedπ-electron charge D

In endothermic reactions, the heat contents of the surrounding air

• Remains constant A
• Decreases B
• Increases C
• Fluctuates rapidly D

Ethyl bromide is formed by the reaction of HBr with

• Ethane A
• Ethene B
• Ethyne C
• Propane D

According to Mendleev, the physical and the chemical properties are the periodic function of their

• Atomic number A
• Atomic mass B
• Atomic wt C
• None D

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

• Fourth Bohr orbit to the first Bohr orbit A
• Fifth Bohr orbit to the second Bohr orbit B
• Sixth Bohr orbit to the third Bohr orbit C
• Seventh Bohr orbit to the third Bohr orbit D

Ionization energies increase from left to right along the period due to

• Increase in nuclear charge A
• Repulsion of electron increases B
• Repulsion of protons increase C
• Atomic size increase along the period D

Reaction takes place at anode is

• Ionization A
• Reduction B
• Oxidation C
• Hydrolysis D

Exposure to CO results in

• Headache A
• Fatigue B
• Unconsciousness C
• All of these D

Which of the following form normal oxide

• K A
• Li B
• Na C
• None D

The principle quantum number describes

• The distance form the nucleus A
• The shape of the orbital B
• The orientation of the orbital C
• The spin of the electron D

Drawback DDT as presticide is

• I becomes ineffective after some time A
• It is less effective than others B
• It is not easily/rapidly degraded in nature C
• Its high cost D

When potassium metal is exposed to violet light

• Ejection of electrons takes place A
• Ejection of some potassium atoms occurs B
• There is no effect C
• The absorption of electrons takes place D

Which of the following does not turn Schiff's reagent to pink?

• Formaldehyde A
• Bezaldehyde B
• Aceton C
• Methyl chloride D

• Diastase A
• Lipase B
• Inverters C
• Zymase D

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

• H₂O A
• NH₃ B
• HCl C
• CO₂ D

Coligative properties are the properties of

• Dilute solution which behave as nearly ideal solutions A
• Concentrated solutions which behave as nearly non-ideal solution B
• Both (i) and (ii) C
• Neither (i) and (ii) D

The equivalent conductivity of 0.1 M week acid is 100 times less than at infinite dilution. The degree of dissociation is

• 100 A
• 10 B
• 0.01 C
• 0.001 D

The organic compound, alcohols are much closer to, in structure and hence is also called its derivative:

• Water A
• Oxidizes of lithium oxides B
• Oxidizes of magnesium C
• Oxidizes of aluminium D

Hydrolytic reaction of fats by causic soda is known as

• Acetylation A
• Carboxylation B
• Esterification C
• Saponification D

Nitrogen is present in atmosphere by weight:

• 75% A
• 76% B
• 77% C
• 78% D

Alkyl benzenes are readily oxidized by axidfied

• KMnO₄ A
• K₂CO₃ B
• MnO₄ C
• H₂SO₄ D

Which is not a method for solid waste management

• Landfill A
• Incinerating B
• Recycling C
• None of these D

Which compound would undergo nucleophilic addition

• Ethene, C₂H₄ A
• Bromoethane, C₂H₅Br B
• Ethanal, CH₃CHO C
• Ethane, C₂H₆ D