ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Replacement of hydrogen atom by - SO₃H group in benzene is called

• Nitration A
• Alkylation B
• Sulphonation C
• Acylation D

Fe⁺³and Mn²⁺are strong paramagnetic because the number of unpaired electrons in each is

• 4 A
• 5 B
• 6 C
• 7 D

During the manufacturing process of cement the temperature of the decomposition zone goes up:

• 600°C A
• 8000°C B
• 1000°C C
• 1200°C D

The boiling point of heavy water is

• 108°C A
• 101.4°C B
• 99°C C
• 110°C 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

All facts of chemistry must be in simple logical patterns because chemistry is a subject:

• Simple A
• Complex B
• Un-understandable C
• Easy D

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

• It attaches to sulphur of the disulphide link A
• Hg is a heavy metal B
• Hg is liquid at room temperature C
• Hg is non reactive chemically D

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

• Hund's rule A
• Pauli exclusion principle B
• Aufbau principle C
• Mosley's law 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

A pseudo uni-molecular reaction has order of reaction :

• 3 A
• 2 B
• 1 C
• 0 D

Sodium forms largely

• Normal oxides A
• Per-oxides B
• Superoxides C
• None of these D

• RCH(CH₃)CO₂H + CH₃OH A
• RCH(CH₃)CO₂H + HCO₂H B
• RCH(CH₃)OH + CO₂ C
• RCH(CH₃)OH + HCO₂H D

Transition elements are called so because:

• Form interstital sompounds A
• have high m.p B
• In between 's' and' 'p' block elements C
• All of these D

Saponification of ethyl benzoate with caustic soda

• Benzyl alcohol,ethanoic acid A
• Sodium benzoate, ethanol B
• Benzoic acid, sodium ethoxide C
• Phenol, ethanoic acid D

On the basis of VSEPR theory SO₂is a

• Liner molecule A
• A bent molecule B
• A strong molecule C
• A gaseous molecule D

The formula of secondary alcohol is

• R - OH A
• R - CH₂OH B
• R₂CHOH C
• R₃COH D

The valence shell electronic structure of an element is ns²np⁵. The element will along to the group of

• Alkali metals A
• Inert metals B
• Noble gases C
• Halogen D

Which of the following favours the reverse reaction in chemical equilibrium?

• Increasing the concentration of the reactant A
• Removal of the least one of the products at regular intervals B
• Increasing the concentration of one or more of the products C
• None of these D

By simply reacting Grignand's reagent with water we get

• An alkane A
• Higher alkane B
• An alkene C
• An alkyne D

By comparing both initial and final states of the system, we can describe the change taking place in the

• Surrounding A
• Both a and c B
• System C
• None of above D

The main source of natural fibre is

• Animal fibres A
• Vegetables fibres B
• Mineral fibres C
• All of the above D

Chlorofluorocarbon, CF₂CI₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following ions has more electrons than protons and more protons than neutrons.

• D- A
• D2O+ B
• He+ C
• OH- D

How many mole of acidfied FeSO₄solution can be completely oxidized by one mole of KMNO₄?

• 10 A
• 5 B
• 6 C
• 2 D

In the ground state, an element has 13 electrons in its M shell. The element is

• Copper A
• Chromium B
• Nickel C
• Iron D

Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively

• Zinc dust and soda lime A
• Soda time and zinc dust B
• Zinc dust and sodium hydroxide C
• Soda lime and copper D

Which alcohol may be oxidised to a product which react with 2,4-dinitorphenylhydrazine reagent but not with Fehling's reagent

• Butan-1-ol A
• Butan-2-ol B
• 2-methylpropan-1-ol C
• 2-methylpropan-2-ol D

d-block elements closely resemble in their physical and chemical properties. Which statement is incorrect

• They show variable valency A
• Their ions and compounds are coloured B
• They are good conductors of heat and electricity C
• Their compounds are diamagnetic D

Select from the following which one is alcohol?

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

Interstitial compounds have

• Half formula A
• Fixed formula B
• Indefinite formula C
• None D