ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

• [A] = [B] A
• [A] < [B] B
• [B] = [C] C
• [A] > [B] D

For a gas obeying Boyle's law if pressure is doubled, the volume becomes :

• Remain constant A
• Double B
• One half C
• None of above D

The OH group present in acids may be replaced by CI atom on treatment with

• PCI₅ A
• SOCI₂ B
• Both of them C
• None of the above D

Which one of the following elements is not present in all proteins?

• Carbon A
• Hydrogen B
• Nitrogen C
• Sulphur D

What are the products electrolysis of aqueous sodium chloride at two electrodes

• Chlorine at anode and oxygen at cathode. A
• Hydrogen at anode and chlorine at cathode. B
• Chlorine at anode and hydrogen at cathode. C
• Chlorine at anode and sodium at cathode. D

Polysaccharides are also called

• Crystals A
• Sugars B
• Liquids C
• None sugars D

Which of the following element has the maximum electron affinity?

• F A
• S B
• I C
• Cl D

To ensure that ethanol is not used for drinking purpose it is converted to methylated spirit by adding.

• 10% methanol and a little acetone A
• 10% petrol and little diesel B
• 50% Alcohol C
• Only 10% methanol D

Fe⁺³and Mn²⁺are strong paramagnetic because the number of unpaired electrons in each is

• 4 A
• 5 B
• 6 C
• 7 D

3.01 x 10²²Ag⁺ions is present in

• 85 grams AgNO₃ A
• 0.85 g AgNO₃ B
• 8.5 g AgNO₃ C
• 18.5 g AgNO₃ D

Which of the following pair of atomic numbers represents s-block elements?

• 7, 15 A
• 6, 12 B
• 9, 17 C
• 3, 20 D

During nitration of benzene, the active nitrating agent is

• NO3 A
• NO2+ B
• NO2- C
• HNO3 D

An azeotropic mixture of two liquids boils at a lower temperature than either of them when :

• It is saturated. A
• It shows positive deviation from Raoult's law. B
• It show negative deviation from Raoult's law. C
• It is metastable. D

n + l value for 4f will

• 2 A
• 5 B
• 7 C
• 9 D

The number of moles of solute in 1000g (1 Kg) of the solvent is called :

• Molarity A
• Molarity B
• Normality C
• Mole fraction D

Ethyl acetate reacts with CH₃MgBr to form

• Secondary alcohol A
• Tertiary alcohol B
• Primary alcohol and acid C
• Acid D

Which of the following is acidic?

• SO₃ A
• N₂O B
• BeO C
• HgO D

CnH_2nis the general formula of

• Alkanes A
• Alkanes B
• alkynes C
• None of above D

Optical activity is possible in

• Oxalic acid A
• Acetic acid B
• Tartaric acid C
• Formic acid D

When an aqueous solution of potassium salt of monocarboxylic acid is subjected to electrolysis, corresponding alkane is formed. This reation is known as

• Cannizaro reaction A
• Sabatier-secderens reaction B
• Alkylation C
• Kolbe's reaction D

Which of the following was discovered first:

• Charge to mass ratio of electrons. A
• Mass of electrons. B
• Charge of electrons. C
• All of above at same time. D

An electron with n = 3 , l = 2 will be in the sub-shell

• 3p A
• 3d B
• 3f C
• 3s D

Which carbon is more electronegative?

• sp³- hybridized carbon A
• sp-hybridized carbon B
• sp²-hybridized carbon C
• always same irrespective of its hybrid state D

The reaction of Zinc with copper sulphate solution is an example of

• Oxidation reduction reaction A
• Spontaneous reaction B
• Spontaneous redox reaction C
• Non-spontaneous reaction D

Which of the following is a method of converting a unsaturated ketone into unsaturated hydrocarbon?

• Aldol condensation A
• Reimer Tiemann reaction B
• Cannizaaor's reaction C
• Wolf-kishner reduction D

When H₂and I₂are mixed and equilibrium is attained, then

• Amount of HI formed is equal to the amount of H₂dissociated A
• HI dissociation stops B
• The reaction stops completely C
• None of these D

The relative abundance of Pb isotopes is 1.5% Pb²⁰⁴, 23.6% Pb²⁰⁶, 22.6% Pb²⁰⁷, 52.3% Pb²⁰⁸The relative atomic mass of Pb is

• 207.94 A
• 208.24 B
• 206.94 C
• 207.24 D

What will react differently with the two isomeric pentols, (CH₃)₃CCH₂OH and (CH₃)₂CH CH₂CH₂OH

• Acidified (aq) KMnO₄ A
• Concentrated H₂SO₄ B
• PCl C
• Sodium D

A cell in which electric current is produced as a result spontaneous redox reaction is called :

• Dry cell A
• Electrolytic cell B
• Galvanic cell C
• Standard cell D

Sodium thisoulophate is used in photography because of its

• Oxidizing behaviour A
• Reducing behaviour B
• Complexing behaviour C
• Photochemical behaviour D