ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Rare earth elements are

• s-block elements A
• p-block elements B
• d-block elements C
• f-block elements D

The state of equilibrium refers to

• State of rest A
• Dynamic state B
• Stationary state C
• State of inertness D

In 1000 molecules of 0.001 M acetic acid the number of H⁺ions is 12.6, then its percentage of ionization is

• 1.33% A
• 1.26% B
• 12.6 C
• 1% D

The major components of coal gas are

• Hydrogen and methane A
• Ethane and carbon monoxide B
• Nitrogen and ethane C
• Ethane and carbon dioxide D

Vitamin A is present in

• Liver A
• Milk B
• Green vegetables C
• All D

B.O.D is connected with

• Organic matter A
• Microbes B
• Mircrobes and organic matter C
• None of the above D

Select from the following which one is alcohol?

• CH₃-CH₂-OH A
• CH₃-O-CH₃ B
• CH₃COOH C
• CH₂-CH₂-BR D

Which is the longest period of the periodic table

• 5th A
• 7th B
• 6th C
• 2nd D

Which one of the following is a water soluble vitamin

• Niacin A
• Riboflavin B
• Tyrosine C
• Ascorbic acid D

The example of colligative property is

• Boiling point A
• Osmosis B
• Freezing point C
• Osmotic pressure D

The period table contains elements in vertical column. these vertical column are called

• Groups A
• Periods B
• Blocks C
• Sub group D

Which of the following is an aromatic compound

• Propanol A
• Cyclohexane B
• Acetone C
• Benezene D

During oxidation in k₂Cr₂O_{7, Cr VI changes to :}

• I A
• II B
• III C
• IV D

In Lucas test teriary alcohol make an oily layer

• Immediately A
• In 10 mins B
• On heating C
• Not D

First of all, idea of groups and periods was introduced by:

• Al-Razi A
• Dobriener B
• Newland C
• Mendeleev D

Among the following polymers, the strongest molecular forces are present in

• Elastomers A
• Fibres B
• Thermoplactics C
• Thermosetting polymers D

Among the alkaline earth metals the element forming predominantly covalent compounds is

• Be A
• Mg B
• Sr C
• calcium D

The elements with atomic numbers 9, 17, 35, 53, 85 an all

• Noble gases A
• Halogens B
• Heavy metals C
• Light metals D

During the process of crystallization, the hot saturated solution:

• is cooled very slowly to get large size crystals A
• is cooled at a moderate rate to get medium sized crystals of the product B
• is evaporated to get the crystals of the products C
• is mixed with an immiscible liquid to get the pure crystals of the product. D

• Electronphilic substitution A
• Electrophilic addition B
• Free radical substitution C
• Nuclephilic substitution D

ΔH is equal to

• E + PV A
• E + PΔV B
• ΔE + P C
• ΔE + PΔV D

Source of organic compounds primarily is:

• Plants A
• Animals B
• Minerals C
• A & B D

Which reaction is of condensation or addition elimination reaction?

• Ketol A
• Aldol B
• Cannizzaro C
• All of these D

0.5 mole of CH₄and 0.5 mole of SO₂gases have equal

• Volume A
• Mass is gram B
• Total number of atoms C
• Number of molecules D

A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?

• SO A
• SO₂ B
• SO₃ C
• SO₄ D

Aromatic hydrocarbons are the derivatives of:

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

Zn does not displace Mg from MgSO₄solution because

• Zn is more electropositive than Mg A
• Zn is below Mg in electropositive series B
• Zn is above Mg in electrochemical series C
• Zn is trivalent Mg is divalent D

A limiting reactant is one which according to the stoichiometric equation

• Has excess mass A
• Has least mass B
• Has excess number of moles C
• Has least number of moles D

Which one of the following step is not involved in determination of empirical formula

• Determination % of each element A
• Determination of gram atom of each element B
• Determination of isotopes of each element C
• Determination of atomic ratio of element D

The molar boiling point constant is the ration of elevation in boiling point to :

• Molarity A
• Molarity B
• Mole fraction of solvent C
• Mole fraction of solute. D