ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The charge of an electron is determined by

• J.J. Thomson A
• Crooks B
• Perrin C
• R.A.Millikan D

The valence shell electronic structure of an element is ns²np⁵. The element will along to the group of

• Alkali metals A
• Inert metals B
• Noble gases C
• Halogen D

In endothermic reactions, the heat contents of the:

• Products equal to the reactants. A
• Reactants more than that of products. B
• Products more than that of reactants C
• Both (b) and (c) D

Aldehydes are reduced to :

• Pri-alcohol A
• Sec-alcohol B
• Ter-alcohol C
• All of these D

Perchloric acid can be stored in solution form

• 47% A
• 57% B
• 67% C
• 77% D

In purification of potable water the coagulant used is

• Nickle sulpahte A
• Copper sulpahte B
• Barium sulpahte C
• Alum D

Grignard's reagent on treatment with carbonyl compounds yield

• Pheonol A
• Alcohol B
• Alkane C
• None of these D

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

The presence of a double bond in a compound is the sign of

• Saturation A
• Unsaturation B
• Substitution C
• None of above D

A transition element is defined as an element of 3d series

• Which is metal A
• Which has one stable ion B
• Which has two stable ions C
• Which has at least one stable ion with incomplete d-orbital 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

By comparing both initial and final states of the system, we can describe the change taking place in the

• Surrounding A
• Both a and c B
• System C
• None of above D

Which of the following reagents is used to distinguish acetone and acetophenone

• NaHSO₃ A
• Grinard reagent B
• Na₂SO₄ C
• NH₄Cl D

Newland gave his law in the year:

• 1829 A
• 1864 B
• 1871 C
• 1913 D

Which of the following may affect the rate constant (k) fro a reaction :

• Change in concentration. A
• Change in pressure. B
• Change in pH. C
• Change in temperature. D

Which of the following molecules has unpaired electrons in anti-bonding molecular orbitals?

• O₂ A
• N₂ B
• Br₂ C
• F₂ D

In the ground state, an element has 13 electrons in its M shell. The element is

• Copper A
• Chromium B
• Nickel C
• Iron D

Hydrolytic coversion of sucrose into glucose and fructose is known as

• Induction A
• Inversion B
• Insertion C
• Inhibition D

Permonosulphuric acid is known as

• Marshall's acid A
• Carlo's acid B
• Sulphuric acid C
• None of these D

Tollen's reagent is

• Ammonical cuprous chloride A
• Ammonical cuprous oxide B
• Ammonical silver bromide C
• Ammonical silver nitrate D

Carbon monoxide is pollutant as it

• Inactivates nerves A
• Inhibits glycolysis B
• Combines with oxygen C
• Combines with hemoglobin D

An oil or fat with no double bond have iodine number:

• Zero A
• 100% B
• 50% C
• Minimum D

Which of the following has magnesium?

• Carbonic anhydrase A
• Haemocyanin B
• chlorophyll C
• Vitamin B₁₂ D

Which is not a calcarious material

• lime A
• clay B
• marble C
• marine shell D

In a lime kiln, to get higher yield of CO₂, the measure that can be taken is

• To main high temperature A
• To pump out CO₂ B
• To remove Cao C
• To add more CaCO₃ D

Carbolic acid is the other name for

• Methanol A
• Ethanol B
• Propanol C
• Phenol D

• Small change in concentration of product A
• Small time internal B
• Co-efficient of the reactant C
• Co-efficient of the product D

Fluorine molecule is formed by

• The axial p-p overlap A
• The sidewise p-p overlap B
• The axial s-p overlap C
• The overlap of two sp²hybrid orbitals D

A food chemist wants to create the odour of pineapples for a product. An ester with this odour has the formula C₃H₇COOC₂H_5.Which pair of reagents would produce this ester

• C₂H₅CI and C₃H₇COOH A
• C₂H₅OH and C₃H₇CONH₂ B
• C₂H₅OH and C₃H₇COOH C
• C₃H₇OH and C₂H₅COCI D

The substance upon which an enzyme acts is known as its

• Domain A
• Field B
• Substrate C
• Reactant D