ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

• 1-bromobutane A
• 2-bromobutane B
• 1-bromo-2-methyl propane C
• 2-bromo-2-methyl propane D

Which is not state function

• Temperature A
• Enthaply B
• Entropy C
• Internal energy D

Group VA of the periodic table consists of the elements N, P, As, Sb and Bi, On passing from N to Bi, the oxides of the elements of general formula M₂O₃become

• Stronger reducing agents A
• More ionic B
• More basic C
• More volatile 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

Resonance energy of benzene is (in KJ mol^-1)

• 120 A
• 150 B
• 170 C
• 180 D

As a fixing agent in photography, sodium thisoulphate is used for

• Dissolving out unreacted silver bromide A
• Converting silver B
• Reducing solubility of AgBr C
• Preventing overdeveloping and fogging D

A polymer may be

• Homopolemer A
• Co-polymer B
• Terpolymer C
• All of these D

Gases shows uniform behavior toward their :

• Internal conditions A
• External conditions B
• Internal and external conditions C
• None of above D

A large value of K_cmeans that at equilibrium :

• Less reactant and more products. A
• Reactants and product in same amounts. B
• More reactants and less products. C
• None of above. D

Which is not a method for solid waste management

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

A graph between P and 1/V at constant temperature and number moles of a gas meets the

• y-axis A
• x-axis B
• origin C
• none of above D

• 4 mole per dm³ A
• 2 mole per dm³ B
• 0.33 mole per dm³ C
• 0.67 mole per dm³ D

A compound used as eye wash:

• Borax A
• Boric acid B
• Metabolic acid C
• Pyroboric acid D

Which is an essential constituent of chlorophyll

• Be A
• Fe B
• Mg C
• Ca D

The energy absorbed when an electron is added to a gaseous atom to form a gaseous ion is called

• Electron affinity A
• Ionization energy B
• Both of these C
• None of these D

Benzene cannot undergo:

• Substitutions reactions A
• Addition reactions B
• Oxidation reactions C
• Elimination reactions D

Acetic acid is 1.33% ionized, In 1000 molecules of 0.1 M acetic acid the number of H⁺ions is

• 1.33 A
• 13.3 B
• 1.33 C
• 1 D

The colour of ppts formed by Fehling's test is

• Brick red A
• Red B
• Yellow C
• Orange D

Mass of simple electron is:

• 9.1 x 10^-31 kg

  A

• 9.1 x 10^-30 kg

  B

• 1.66 x 10^-31 kg

  C

• 9.1 x 10^-31 kg

  D

Reaction of Grignard's reagent with ketones gives: Reaction of Grignard's reagent with formaldehyde gives:

• Pri-alcohol A
• Sec-Alcohol B
• Ter-alcohol C
• Carboxylic D

When a piece of zinc is added to the copper sulphate solution, _______ colour of solution disappear

• Pink A
• Purple B
• Blue C
• Brown D

Debye forces are present in one of the following pairs

• Na⁺ion and water A
• Argon and water B
• Argon and Na⁺ion C
• Ne and Water D

Incomplete oxidation of alkanes yields

• CO₂& carbon black A
• CO₂+ heat B
• CO and carbon black C
• CO + heat D

Heat,. work and internal energy of the system and surroundings are related into an equation which is called

• First law of thermodynamics A
• Hess's law B
• Henry's law C
• Born-haber cycle D

When sulphur is boiled with Na₂SO₃solution, the compound formed is

• Sodium sulphides A
• Sodiums sulphates B
• Sodium persulphate C
• Sodium thiosulphate D

What is the total number of different chloroethanes, formula C₂H_6-nCl_n, where n can be any integer from 1 to 4

• 4 A
• 6 B
• 7 C
• 8 D

Which has greater number of moles

• 0.1 g sodium A
• 6.02 x 10²⁰atoms of magnesium B
• 20 cm³0.1mole per dm³of NaOH C
• 12.2 dm³of nitrogen at standard
  [A_rNa = 23, Mg = 24, O = 16]
  D

Which one of following is not monocyclic aromatic hydrocarbon

• Benzaldehyde A
• Benzoic acid B
• Benzene sulfonic acid C
• Biphenyl D

The strongest forces are:

• Debye froces A
• London dispersion B
• Dipole-dipole attraction C
• Hydrogen bonding D

• 2-bromonitrobenzene A
• 2-nitrobromobenzene B
• 1-bromonitrobenzene C
• 1-nitrobromobenzene D