ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Benzene cannot undergo

• substitution reactions A
• addition reactions B
• oxidation reactions C
• elimination reactions D

The only alcohol that can be prepared by the indirect hydration of alkene is

• ethyl alcohol A
• propyl alcohol B
• isobutyl alcohol C
• methyl alcohol D

• 8 g A
• 16 g B
• 32 g C
• 24 g D

Alkyl halides on treatment with metallic Na give

• Alkynes A
• Alkenes B
• Alkanes C
• Alcohols 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

In Tolten's best, the end product is ______ formed

• White ppts A
• Red ppts B
• Yellow ppts C
• Silver mirror D

Borax is a common mineral of alkali metal sodium. Its formula is

• Na₂B₄O₇ A
• Na₂,B₄O₇. 10H₂O B
• Na₂B₃O₆. 10H₂O C
• Na₂B₄O₇- 5H₂O D

Major fertilizers with micro-nutrients are:

• Nitrogeneous A
• Phosphalic B
• Potash C
• All of these D

The coordination number of iron in [Fe(H₂O)₆]³⁺is

• 2 A
• 3 B
• 4 C
• 6 D

Dobereiner gave his law in the year:

• 1829 A
• 1864 B
• 1871 C
• 1931 D

Which noble gas is used in mixture used for breathing by divers?

• Cl₂ A
• NH₃ B
• CO₂ C
• He D

Esters have peculiar smell, which of the following is used as an essence of orange

• Isoamyl acetate A
• Iosamyl valerate B
• Octyl acetate C
• Methyl butyrate D

Rutherford's experiment led to the discovery of

• Nucleus A
• Electron B
• Proton C
• alpha particle D

Which is a protein?

• Nylon A
• Rayon B
• Natural silk C
• Terylene D

A beaker contains 9 grams of water. The number of H-atoms is

• 6.02 x 1023 A
• 3.01 x 1023 B
• 6.02 x 1024 C
• 3.01 x 1024 D

The stroids of fungi and yeast and yeast are called:

• Vitamin D A
• Vitamin D₂ B
• Ergostrol C
• Cholestrol D

If a large number of amino acids (hundreds to thousands) are joined by peptide bonds, the resulting product is called

• Dipeptide A
• Tripeptide B
• Polypeptide C
• None of these D

(CH₂O)_nis general formula for

• Monosaccharides A
• Oiligosaccharides B
• Polysaccharides C
• None of these D

Simple sugars are :

• Monosacchrides A
• Disaccharides B
• Oligo saccharides C
• Trisaccharides D

The electrophile in aromatic sulphonation is

• H₂SO₄ A
• HSO₄ B
• SO₃ C
• SO₃⁺ D

• 3 A
• 4 B
• 5 C
• 2 D

Benzene was discovered by first of all

• Michael Faraday A
• Hofmann B
• Ainderson C
• Sorenbon D

The orbitals having n + l = 5 are

• 2p, 3d,3s A
• 3p, 3d, 5s B
• 3s, 4p, 4d C
• 5s, 4p, 3d D

The protection of steel by chrome plating is due to

• Cathodic protection A
• Anodic protection B
• Covering of steel surface C
• Formation of alloy with iron D

Which more acidic?

• o-cresol A
• p-nitrophenol B
• phenol C
• m-cresol D

In an exothermic reaction

• Enthalpy of reactants is lesser than that of products A
• Enthalpy of reactants is greater than that of products B
• Heat is transferred form surrounding into the system C
• Enthalpy of reactants and products same D

Which of the following compound is industrially prepared by the electrolysis of solution of NaCl

• Na₂CO₃ A
• NaHCO3 B
• NaOH C
• NaOCl D

A colloidal gel is

• 3cA, Al₂O₃ A
• CaSO₂.2H₂O B
• 3CaAl₂O₃.3CaSO₄.2H₂O C
• 3Ca.Al₂O₃.6H₂O D

Which one of the following gases is used for artificial ripening of fruits ?

• Ethane A
• Ethyne B
• Methane C
• Propane D

The substance which increases rate of reaction but remains unchanged at the end of reaction is called :

• Catalyst. A
• Indicator. B
• Promoter. C
• Activator. D