ECAT Chemistry MCQ's Test For Full Book

Among group V-A elements, the most electronegative element is

• Sb A
• N B
• P C
• As D

All the elements of oxygen family are

• Non metals A
• Metalloids B
• Radioactive C
• Polymorphic D

Which of the following is not correct about transition metals?

• Their melting and boiling points are high A
• Their compounds are generally coloured B
• They can form ionic or covalent compounds C
• They do not exhibit variable valency D

Ethyl bromide is formed by the reaction of HBr with

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

DDT is formed from

• Benzene and Chlorobenzene A
• Chloral and Chlorobenzene B
• Chloral and Benzene C
• Chlorobenzene and chlorine D

The increase in size of the anion is due to:

• Increase in electron-electron repulsion A
• Increase in valence shell electrons. B
• Decrease in valence shell electrons. C
• Both (a) and (b). D

Two different hydrocarbon each contain the same percentage by mass of hydrogen. It follows that they have the same

• Empirical formula A
• Number of atoms in a molecules B
• Number of isomers C
• Relative molecular mass D

Monosaccharides and oligosacchradies are generally called as

• Crystals A
• Sugars B
• Liquids C
• Non-sugars D

Oxidation state of fluorine is

• +1 A
• +2 B
• -1 C
• -2 D

95% ethanol is called:

• Rectified other A
• Diesel B
• Rectified spirit C
• Petrol D

Second most element in the universe is

• He A
• Ne B
• Ar C
• Kr D

Which of the following is a typical transition metal?

• Sc A
• Y B
• Ra C
• Co D

Alkali and alkaline earth metals are basic oxides except:

• Li A
• Be B
• Fr C
• Ba 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 unit of rate constant is the same as that of the rate of reaction in :

• First order reaction. A
• Second order reaction. B
• Zero order reaction. C
• Third order reaction. D

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

• I A
• II B
• III C
• IV D

Which have better penetrating power

• Alpha rays A
• Beta rays B
• Gamma rays C
• X-rays D

The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called

• Electroplating A
• Electrolysis B
• Conduction C
• Induction D

The amino acids which human body can synthesize are called ______ amino acid

• Essential A
• Non essential B
• Acidic C
• Basic D

Bond angle is minimum for

• H₂O A
• H₂S B
• H₂Se C
• H₂Te D

• s A
• p B
• d C
• f D

The mineral CaSO₄.2H₂O has the general name

• gypsum A
• dolomite B
• calcite C
• epsom salt D

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called a:

• Fiber A
• Plastic B
• Vanish C
• Polyamide resin D

The fourth period contains elements

• 8 A
• 16 B
• 18 C
• 32 D

Boiling point of acetic acid is ^oC

• 116 A
• 117 B
• 118 C
• 119 D

Composition of clay in cement is:

• 25% A
• 50% B
• 75% C
• 80% D

The acid present in vinegar is

• CH₃COOH A
• HCI B
• H₂SO₄ C
• HCOOH D

In the electronic configuration of Cr one electron from 4s sub-shell is transfered to 3d sub-shell because

• The 3rd orbital is of lower energy than 4s A
• The 4s orbital is of equal energy to 3d orbital B
• The half filled d-subshell is more stable than incomplete d-sub shell C
• 6 unpaired electrons make Cr more paramagnetic D

Number of elements present in 5th period is

• 8 A
• 18 B
• 32 C
• 24 D

Nitrogen is present in atmosphere by weight:

• 75% A
• 76% B
• 77% C
• 78% D