ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

1.0 g pure calcium carbonate was found to require 50 ml of dilute HCl for complete reaction. The strength of HCl solution is given by

• 4 N A
• 2 N B
• 0.4 N C
• 0.2 N D

In the reaction 6 NaOH +3Cl ----------- 5NaCl +H2O + NaClO3, Chlorine is.

• Oxidized A
• Both B
• Reduced C
• None D

Which of the following half molar solutions will have lowest freezing point

• Solution of non-volatile, none electrolyte A
• Solution of non volatile, weak electrolyte B
• Solution of non volatile strong electrolyte C
• Solution of volatile, non electrolyte D

Hydrocarbons are divided into aliphatic, alicyclic and aromatic which structure among the following show an alicyclic hydrocarbon

• 
  A
• 
  B
• 
  C
• 
  D

Carbon atom holding halogen in aryl halides is

• sp²-hybridesed A
• sp³-hybridesed B
• sp-hybridesed C
• sp³d-hybridesed D

Hydrochloric acid available in the laboratory is 36% w/w. The density of HCl solution is 1.19 g cm^-3. The molarity of HCl solution is

• 10.23 moles dm^-3 A
• 11.55 moles dm^-3 B
• 11.73 moles dm^-3 C
• 12.67 moles dm^-3 D

Which of the following liquids has low vapor pressure at 25°C:

• Diethyl ether A
• Acetone. B
• Water. C
• Ethyl alcohol. D

• Low pressure A
• High pressure B
• High temperature C
• High concentration of SO₂ D

Urea has concentration when prepared before prlilling:

• 46% A
• 82% B
• 99.7% C
• 100% D

What happens when isotonic solution of A (mol.wt.342) and B (mol.wt 60) are put in to communication through semipermeable membrane?

• Transference of solvent from solution A to that of B take place A
• Transference of solvent from solution B to that of A takes place B
• No transference of solvent from solution A to that of B takes place C
• Change in temperature of solutions takes place D

Inn which of these processes are small organic molecules made into macromolecules?

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

Poly hydroxyl compounds of aldehyde and ketones are:

• Carbohydrates A
• Proteins B
• Fats C
• Lipids D

Aromatic hydrocarbons are the derivatives of

• Normal series of paraffins A
• Alkene B
• Benzene C
• Cyclohexane D

Which is the most volatile compound

• Hl A
• HCl B
• HBr C
• HF D

Substances that render enzymes catalytically inactive are called

• Conenzymes A
• Substrates B
• Inhibitors C
• Apoezymes D

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

• 500 nm A
• 500 m B
• 200 nm C
• 5 x 10⁷m D

pH of the human blood which is essentially maintained constant due to carbonates, biocarbonates, phosphates etc., is

• 7.00 A
• 7.25 B
• 7.35 C
• 7.47 D

First atomic theory was put forward by an English school teacher:

• Maxewell A
• Newton B
• Sanger C
• John Dalton D

The product of pressure and volume remains constant when temperature and quantity of gas is

• zero A
• variable B
• kept constant C
• None of these D

During electrolysis, the reaction that takes place at cathode is :

• Reduction A
• Both (a) and (c) B
• Oxidation C
• No reaction occurs D

Which is laughing gas?

• NO A
• N₂O B
• NO₂ C
• NO₃ D

The optimum conditions of temperature and pressure to get maximum NH₃form N₂and H₂gases is

• 2000°C and 10 atmosphere A
• 0°C and 1 atmosphere B
• 400°C and 200-300 atmosphere C
• 200°C and 100 atmosphere D

Which of the following reagents is used to distinguish between methanoic acid and ethanoic acid?

• Amm. silver nitrate solution A
• Neutral ferric chloride B
• Sodium hydroxide solution C
• Sodium carbonate solution D

Phosphide ion has the electronic structure similar to that of

• Nitride ion A
• Fluoride ion B
• Sodium ion C
• Chloride ion D

The chemical method used for determination of rate of reaction is

• Spectroscopic A
• Conductiometric B
• Refractometric C
• Titration D

A reaction will also be called a spontaneous if

• It does not need energy to start with A
• It needs energy to carry the whole process B
• It needs energy at the end of reaction C
• It needs energy to start with D

Which of the sub-atomic particles is not charged

• Electron A
• Proton B
• Neutron C
• All of them D

For spontaneity of a cell, which is correct?

• ΔG = 0,ΔE = 0 A
• ΔG = -ve ,ΔE = 0 B
• ΔG = +ve ,ΔE = 0 C
• ΔG = -ve D

The Electro-negatively difference for ionic bond must be greater than

• 1.6 A
• 1.7 B
• 1.8 C
• 1.0 D

Mg becomes isoelectronic with neon when it

• Loses two electrons A
• Gains two electrons B
• Loses 1 electron C
• Gains 1 electron D