ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Oxidation number of oxygen in OF₂is

• +1 A
• -1 B
• +2 C
• -2 D

Monocarboxylic acids exist as dimer because of

• Dipole-dipole attraction A
• Hydrogen bonding B
• Van der Waals forces C
• Conhesive forces D

The ionic strength of a solution containing 0.1 mole/kg of KCl and 0.2 mole/kg of CuSO₄is

• 0.3 A
• 0.6 B
• 0.9 C
• 0.2 D

Which of the following pair contains isomers of each other

• Propanoic acid and propanone A
• Acetone and acetaldehyde B
• Ethyl alcohol and diethyl ether C
• Methyl alcohol and dimethyl ether D

Naphthalene, iodine and NH_{4 can :}

• Sublime. A
• Both (a) and (c). B
• Crystallize. C
• None of above. D

Ethylene combines with water in the presence of H₂SO₄+ HgSO₄and forms

• Ethyle chloride A
• Ethyle alcohol B
• Carboxylic acid C
• None of these 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

Which one of the following has been hydroxyl and carboxylic acid groups

• Phenols A
• Picric acid B
• Phthalic acid C
• Salicylic acid D

Orbitals having same energy are called

• Hybrid orbitals A
• Valence orbitals B
• Degenerate orbitals C
• D-orbitals D

Depletion of ozone layer is due to

• Oxides of nitrogen A
• Oxides of carbon B
• Oxides of sulphur C
• None of the above D

With amino acids ninhydrin solution gives

• Blue A
• Violet B
• Bluish violet C
• White D

Caustic soda is obtained by electrolysis of conc. aqueous solution of NaCI in a cell called

• Daniell's cell A
• Nelson's cell B
• Down's cell C
• Voltaic cell D

Which of the following is not charged particle

• Proton A
• Electron B
• Neutron C
• Hydrogen nucleus D

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

Carboxylic acids are more acidic than pehnol and alcohol because of

• Intermolecular hydrogen bonding A
• Formation of dimmers B
• Highly acidic hydrogen C
• Resonance stabilization of their conjugate base D

Electron affinity depends on

• Atomic size A
• Nuclear charge B
• Atomic number C
• Atomic size and nuclear charge both D

Reaction of Grignard's reagent with formaldehyde gives:

• pri-alcohol A
• sec-alcohol B
• ter-alcohol C
• carboxylic D

When of the following is isolelectronic with krypton

• Ca⁺⁺ A
• Al⁺⁺⁺ B
• Br^-1 C
• I^-1 D

Which of the following is a typical transition metal?

• Sc A
• Y B
• Ra C
• Co D

Which of the following compounds will not react with sodium metal to release hydrogen

• CH₃CH₂CH₃ A
• CH₃CH₂OH B
• C₆H₅OH C
• C₆H₅CH₂OH D

Of the following four reactions, formic acid and acetic acid differ in which respect?

• Replacement of hydrogen by sodium A
• Formation of ester with alcohol B
• Reduction of Fehling solution C
• Blue litmus reaction D

Plastics are pollution problem because many plastics:

• Are made from petroleleum A
• Are very inflammable B
• Burn to produce toxic funes C
• Decompose to produce toxic products D

The temp. and pressure used for PVC polymerization is

• 10°C and 10 atm A
• 20°C and 20 atm B
• 52°C and 9 atm C
• 100°C and 10 atm D

Which of the following is acidic?

• SO₃ A
• N₂O B
• BeO C
• HgO D

Ammonia like water also reacts with Grignard's reagent to give

• Alkane A
• Alkene B
• Alkyne C
• Amide D

Formation of PVC form vinyl chloride is an example of

• Substitution reaction A
• Addition polymerization B
• Condensational reaction C
• Aldol condensation D

A liquid on evaporation causes:

• Heating effect. A
• Cooling effect. B
• Suffocation . C
• All of above D

There are 20α-amino acids found in protein 19 have -- NH₂as the amino group. Only one of theα-amino acids has a secondary amino group which one is this

• Glycine A
• Lysine B
• Proline C
• Cystein D

In which of these processes are smell organic molecules made into macromolecules?

• The cracking of petroleum fractions A
• The fractional distillation of crude oil B
• The polymerization of ethane C
• The hydrolysis of proteins D

Which of the following elements should be the least metallic in character

• Rb A
• ln B
• Te C
• l D