ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Noble gases have the electronic configuration with their valance shell ns²np⁶except one

• He A
• Ne B
• Kr C
• Xe D

Which element belong to 5d series

• V A
• Nb B
• Pd C
• Hf D

Fe can displace Cu form CuSO4solution because

• Fe is ferromagnetic A
• Fe is below Cu in electrochemical series B
• Fe is above Cu in electrochemical series C
• Fe exists in divalent oxidation state D

Which statement is incorrect about standard hydrogen electrode

• Its oxidation and reduction potential is zero A
• It consists of Pt wire dipped on 1 molar HCI solution B
• The electrolyte is 1 molar NaOH solution C
• H₂gas is passes in it at 1 atmospheric pressure D

The tip of the funnel should touch the side of the beaker in order to avoid

• Splashing A
• Leakage B
• Mixing C
• Contamination D

Which of the following is an electrophile

• Bromine A
• KBr B
• NH₃ C
• Benzene D

The bond order of individual C - C bond is benzene is

• One A
• Two B
• Between one and two C
• One and two alternately D

When H₂and I₂are mixed and equilibrium is attained, then

• Amount of HI formed is equal to the amount of H₂dissociated A
• HI dissociation stops B
• The reaction stops completely C
• None of these D

Orbitals having same energy are called

• Hybrid orbitals A
• Valence orbitals B
• Degenerate orbitals C
• D-orbitals D

The volume occupied by 1.4 g of N₂ at S.T.P is

• 2.24 dm³ A
• 22.4 dm³ B
• 1.12 dm³ C
• 112 cm³ D

The wave number of the line emitted is 109.678 x 10⁵m^-1in the Lyman series when electron transition occurs

• 
  A
• 
  B
• 
  C
• 
  D

The ionic strength of a solution containing 0.1 mole/kg of KCl and 0.2 mole/kg of CuSO₄is

• 0.3 A
• 0.6 B
• 0.9 C
• 0.2 D

Which of the following is acidic?

• SO₃ A
• N₂O B
• BeO C
• HgO D

Unit of ozone is:

• Debye A
• Dobson B
• Esu C
• Coulumb D

Every sample of matter with uniform properties and a fixed composition is called a :

• Solid A
• Liquid. B
• Phase. C
• Gas. D

A condensation polymer among the following is

• Dacron A
• PVC B
• Polysterene C
• Teflon D

The range of UV-B is:

• 320 to 400 nm A
• 200 to 280 nm B
• 280 to 320 nm C
• 50 to 400 nm D

Which of the following is a tetrabasic acid?

• ORthophosphoric acid A
• Hyposphosphorus acid B
• Metaphosphoric C
• Pyrophosphoric acid D

The experimental relationship between a reaction rate and the concentration of reactants is called

• Order or reaction A
• Rate law B
• Activated complex C
• Molecularity D

pKb value of NH₄OH is 4.74. If the concentration of NH₄OH is 1 molar containing 0.1 molar NH₄Cl, then pH of this buffer will be

• 3.74 A
• 10.26 B
• 4.74 C
• 9.26 D

• 2-chlorobutanal A
• alfa-chlorobutanal B
• 2-chlorobutyraldehyde C
• alfa- chlorobutyraldehyde D

Number of elements present in 5th period is

• 8 A
• 18 B
• 32 C
• 24 D

Rare earth elements are

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

Rectified spirit contains alcohol about

• 80% A
• 85% B
• 90% C
• 95% D

HNO₂acts as an/a

• Acid A
• Oxidizing agent B
• Reducing agent C
• All the three D

• Hear of reaction A
• Heat of formation B
• Heat of neutralization C
• Heat of combustion D

Which is not the poplar reaction

• 
  A
• 
  B
• 
  C
• 
  D

Give IUPAC name fo Acetone

• Ethanal A
• Propanone B
• Butanone C
• Propanal D

Which one of the following statement is wrong regarding differences between aldehydes and ketones

• Aldehydes undergo reduction to form primary alcohols while ketones undergo reduction to form secondary alcohols A
• Aldehydes undergo oxidation to form acids having less number of carbon atoms while ketones undergo oxidation to form acids having same number of carbon atoms B
• Aldehydes give positive silver mirror test while ketones give negative -mirror test C
• Aldehydes can undergo polymerization while ketones cannot undergo polymerizarion D

When during electrolysis of a solution of AgNO₃, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

• 1.08 g A
• 10.8 g B
• 21.6 g C
• 108 g D