ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

The amount of heat evolved or absorbed by keeping reactants and products at one atmospheric pressure at room temperature is called

• Heat of formation A
• Standard heat of formation B
• Standard enthaply change C
• None D

In electrolytic cells, the chemical changes may be :

• Either spontaneous or non-spontaneous A
• Always spontaneous B
• Always non-spontaneous C
• More spontaneous and less non-spontaneous. D

The rate of a chemical reaction is directly;y proportional to product of molar concentration of reaction substance it is called :

• Low of conservation of energy. A
• Law of mass action. B
• Rate law . C
• Active mass rule. D

Linear shape is associated with set of hybrid orbitals?

• sp A
• sp2 B
• sp3 C
• dsp2 D

The rotation of two carbon atoms joined by double bond would happened only if

• Pi bond is broken A
• Sigma bond is broken B
• Both bonds are broken C
• None of above D

Potassium chromate has formula

• KClO₃ A
• K₂CO₃ B
• K₂CrO₄ C
• K₂Cr₂O₇ D

Which of the following synthetic phosphorous fertilizers is marked as super phosphate

• Calcium dihydrogen phosphate A
• Appetite B
• Calcium phosphate C
• Wavellite D

The molal depression constant depends upon

• Nature of solute A
• Nature of solvent B
• Δ H_solution C
• Vapour pressure of solution D

The most suitable method of the separation of a mixture of ortho and para-nitrophenol mixed in the ratio of 1: 1 is

• Distrillation A
• Crystallization B
• Vapourisation C
• Colour spectrum D

The temperature in the incineration process has a range:

• 900°Cto 1000°C A
• 650 to 1100°C B
• 950°C to 1300°C C
• 500°C to 900°C D

When alcohol reacts with concentreated H₂SO₄intermediate compound formed as

• carbonium ion A
• alkoxy ion B
• alkyl hydrogen sulphate C
• non of these D

The colour of ppts formed by Fehling's test is

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

When the degree of freedom increase the entropy ______

• Decreases A
• Increases B
• Remains same C
• All D

The difference between amount of heat actually released and that of calculated is called

• Bonding energy A
• Activation energy B
• Resonance energy C
• Transition energy D

The wave length of visible light is 500 nm. In S.I. unit this value is

• 5 x 10^-8m A
• 5 x 10^-9m B
• 500 x 10^-7m C
• 500 x 10^-9m D

The % of CO₂is the atmosphere is

• 3.0% A
• 0.03% B
• 0.3% C
• 0.5% D

Which catalyst is used in contact process?

• Fe₂O₃ A
• V₂O₅ B
• SO₃ C
• Ag₂O D

Oxidation number of oxygen in OF₂is

• +1 A
• -1 B
• +2 C
• -2 D

Major food factors are:

• Fats and oils A
• Carbohydrates B
• Protiens C
• All of these D

A process which takes place on its own without any outside assistance and moves from a non-equilibrium stat towards an equilibrium stat is termed as:

• Spontaneous process. A
• Natural process. B
• Non-Spontaneous process. C
• Both (a) and (b). D

• Primary alkyl halide A
• Secondary alkyl halide B
• Tertiary alkyl halide C
• None of these D

Hydrogen bonding is present in one of the following pairs:

• NH₃ A
• H₂O B
• HF C
• All of above D

Cotton is ______% cellulose

• 90 A
• 100 B
• 99 C
• 30 D

A peptide having molecular mass upto 10,000 is called a

• Vitamin A
• Protein B
• Polypeptide C
• Dipetide D

Mass spectrometer measures the

• Exact mass of an element A
• Average mass of an element B
• The number of elements present in a molecule C
• m/e value of a positive ion D

Hydrolysis of protein by 6M HCl gives peptides and thenα-amino acids. How manyα-amino acids molecules are obtained on the hydrolysis of a tetrapeptide

• 2 A
• 3 B
• 4 C
• 5 D

2SO₂+ O₂⇌2SO₂H= 188KJ mole^-1

Which statement about following equilibrium is correct :

• The value ofK_pfalls with arise in temperature.

  A

• The value ofK_pis equal tok_c.

  B

• The value ofK_pfalls with the increase pressure.

  C

• Adding V₂O₅catalyst increase the equilibrium yield of Sulphur trioxide.

  D

The substance which contains the water of crystallization is called

• Hydrated A
• Solvated B
• Crystal C
• None D

Alcohol reacts with halogen acid to produce

• Alkyl halides A
• Aldelydes B
• Ketones C
• Alkanes D