ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

During the formation of a chemical bond the potential energy of the system

• Decreases A
• Increases B
• Does not change C
• None of these D

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

• 5 x 10^-9 A
• 5 x 10^-12 B
• 5 x 10^-6 C
• 5 x 10^-10 D

Given below are some statements concerning formic acid, which of them is true?

• It is a weaker acid than acetic acid A
• It is a reducing agent B
• When its calcium salt is heated, it forms a ketone C
• It is an oxidizing agent D

Environmental pollution affects

• Biotic components A
• Plants only B
• Man only C
• Biotic and abiotic components of environment D

• N₂O₄is limiting reactant A
• N₂H₄is the limiting reactant B
• Reactants are completely converted to the products C
• Reactions is reversible D

• Le-chatlier's principle A
• Only adding catalyst B
• Decreasing pressure C
• Decreasing temperature D

Addition of iron fillings to CuSO₄solution caused precipitation of Cu owing to the

• Reduction of Cu²⁺ A
• Oxidation of Cu²⁺ B
• Reduction of Fe C
• Reduction of Fe³⁺ D

In the presence of high temperature and pressure peat is converted to:

• Lignite A
• Polymorphism B
• Polymerization C
• Catenation D

Which of the following is an electrophile

• Bromine A
• KBr B
• NH₃ C
• Benzene D

Which is plaster of paris?

• CaSO₄.H₂O A
• (CaSO₄)₂.H₂O B
• CaSO₄.2H₂O C
• CaSO₄.3H₂O D

• Initial concentration of acetic acid A
• Initial concentration of ethyl acetate B
• Equilibrium concentration of acetic acid C
• Equilibrium concentration of ethyl acetate D

Bronze is an alloy which contains

• 60% cu A
• 70% cu B
• 80% cu C
• 99% cu D

The nature of interparticle forces in benzene is

• Dipole-dipole interaction A
• Dispersion force B
• Ion-dipole interaction C
• H-bonding D

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

• Generate heat A
• Remove adsorbed oxygen from electrode surfaces B
• Produce High purity water C
• Create potential difference between two electrodes D

Neutralization of a strong acid with a strong base is

• Natural acid base reaction A
• Artificial acid base reaction B
• Spontaneous acid base reaction C
• both a and c D

N₂ + O₂ ⇌2NO

The unit of K_c for tis reaction will be:

• No unit

  A

• mol^-2 dm^-3

  B

• mol^-1 dm^-3

  C

• mol^-2 dm⁺³

  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

Which functional group is present in glycerol tristearate

• Carboxylic acid A
• Alcohol B
• Aldehyde C
• Ester D

The strong alkaline solution in water is of metal:

• Potassium A
• Sodium B
• Lithium C
• Magnesium D

Which statement about molecule is incorrect ?

• Molecules of a substance are similar A
• Hemoglobin is a homo atomic molecules B
• Oxygen molecule is a macro molecule C
• It exist independently D

Butanenitrile is formed by reaction of KCN with

• Propyl alcohol A
• Butyl chloride B
• Butyl alcohol C
• Propyl Chloride D

• 2 A
• 3 B
• 4 C
• 9 D

The addition of HCN to carbonyl compounds is an example of

• Nucleopihlic substituion A
• Electrophilic addition B
• Nueleophilic addition C
• Electrophilic substitution D

Alkyl halides are considered to be very reactive compounds towards nucleophiles, because:

• They have an electrophilic carbon A
• They have an electrophilic carbon and good living gorup B
• They have an electrophilic carbon and bad living group C
• They have an nucleophilic carbon and good living gorup D

Which of the following elements is not present abundantly in earth's crust?

• Silicon A
• Aluminium B
• Sodium C
• Oxygen D

The reaction rate is expressed in the units of

• mol dm^-3S^- A
• mol dm^-3 B
• mol dm^-3N^- C
• dm^-3S^- D

Factors affecting denaturation of proteins:

• Change in temp and pH A
• Strong reducing agent B
• Strong oxidizing agent C
• All of these D

The bond angle depends upon the

• Types of bonds A
• Number of bonds B
• Non-bonding electron pairs C
• All of the above D

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

• 2 A
• 3 B
• 4 C
• 5 D

Reduction or oxidation potential of standard hydrogen electrode is :

• 0.0 Volt A
• 0.8Volt B
• 1.0Volt C
• 1.8Volt D