ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The total number of transition elements is

• 10 A
• 14 B
• 40 C
• 50 D

The sum of mole percent of all the components of solution is always equal to :

• Less than 100 A
• One B
• 100 C
• 10 D

Benzene reacts with chlorine to form benzene hexachloride in presence of

• Nickel A
• AlCl₃ B
• Bright sunlight C
• Zinc D

Which of the following is explosive:

• Trinitropheonal A
• Nitropheonal B
• Nitromethane C
• Nitrobenzene D

Hydrocarbons contain :

• Carbon only carbon A
• Hydrogen only B
• Carbon & hydrogen C
• Carbon , hydrogen & halogen D

Chlorin heptoxide reacts with water to form:

• Hypochlorous acid A
• Chloric acid B
• Perchloric acid C
• Chlorine and oxygen D

Polymer formation from monomers starts by

• Condensation reaction between monomers A
• Coordination reaction between monomers B
• Conversion of monomer to monomer ions by protons C
• Hydrolysis of monomers D

The shape of methanol, ammonia and water molecule can be explained by assuming

• Sp³ hybridization A
• Sp²hybridization B
• Sp hybridization C
• All of these D

2.5 faradays of electricity is passed through solution of CuSO_{4. The number of gram equivalents of copper deposited on the cathode would be}

• 1 A
• 2 B
• 2.5 C
• 1.25 D

Spraying of DDT produces pollution of

• Air A
• Air and water B
• Air and soil C
• Air, water and soil D

Shape of CIO₃is

• Triangular pyramidal A
• Tetrahedral B
• Triangular planar C
• Triangular bipyramidal D

The radiations with wavelength shorter than violet light are called

• Ultraviolet A
• Infrared B
• Microwave C
• Radio frequency D

Which of the following equation represents reaction when lithium nitrate is heated.

• 2LiNo4------- Li2O + NO2 A
• 4Li NO3 ------- 4LiO2 + 4NO2 +O2 B
• LiNO3---------Li2O + 4NO2 C
• 2LiNO4------- Li2O + NO2+O2 D

What is not true about DNA

• It preserve genetic information A
• To relicates B
• Synthesized protein C
• It has a linear structure D

• 99.2% A
• 99.5% B
• 90.5% C
• 96.2% D

In gases and liquids, temperature is the measure of :

• Average transnational kinetic energies of molecules. A
• Average vibrational kinetic energies of molecules. B
• Average rotational kinetic energies of molecules. C
• None of above D

Alkaline earth metals posses two electrons in their outermost

• F-orbital A
• D-orbital B
• S-orbital C
• P-orbital D

Complete combustion of alkane yields

• CO₂+ H₂O A
• CO₂+ heat B
• CO + H₂O heat C
• CO₂+ H₂O + heat D

C₂H₅OH can be differentiated from CH₃OH by

• Reaction with HCl A
• Reaction with NH₃ B
• Iodoform test C
• Solubility in water D

I-Chloropropane has two isomers, it is an example of

• Chain isomerism A
• Position isomerism B
• Functional group isomerism C
• Metamerism D

A graph between P and PV at constant temperature and number of mole is parallel to

• y axis A
• z axis B
• x axis C
• pressure axis D

Law of mass action states that rate of chemical reaction is directly proportional to the product of active masses of the reactants. The term active mass means

• Mass in grams converted to products A
• Number of moles B
• Number of moles per dm³of reactants C
• Total pressures of the reactants D

The number of moles of solute dissolved per dm³ of the solution is called :

• Normality. A
• Molarity. B
• Molarity. C
• None of above. D

The order of reactivity for a given halogen in Grignard's reagent is:

• CH₃X > C₂H₅X > C₃H₄X > C₄H₄X A
• C₂H₅X > C₃H₇X > C₄H₅X > CH₄X B
• C₃H₇X > C₄H₇X > CH₃X > C₂H₅X C
• C₄H₄X > C₃H₇X > C₂H₅X > CH₄X D

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

• 2,1,0 A
• 2,1,1 B
• 3,1,1 C
• 3,2,1 D

0.5 M of H₂SO₄is diluted from 1 litre to 10 litre, normality of resulting solution is

• 1 N A
• 0.1 N B
• 10 N C
• 11 N D

Sp³hybird orbitals are oriented at an angle of

• 107.5° A
• 108.5° B
• 109.5° C
• 103.5° D

Primary carbon attaches with other hydrogen atoms directly:

• One A
• Two B
• Three C
• At least one or more than it D

The reaction-method that does not give an alkane is

• Catalytic hydrogenation of alkanes A
• Wurtz reaction B
• Hydrolysis of alkyl magnesium bromide C
• Dehydrohalogenation of an alkyl halide D

Which of the sub-atomic particles is not charged

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