ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

• 1 A
• 2 B
• 3 C
• 4 D

Primary and secondary alcohols on action of red hot copper give

• Aldehydes and ketones respectilvely A
• ketones and aldehydes respectively B
• Only aldehydes C
• Only ketones D

A common industrial solvent is a mixture of propanone; CH₃COCH₃, and pentyl ethanoate CH₃CO₂(CH₂)₄CH₃. Which reagent would have no effect on this solvent

• Na_(s) A
• NaBH₄ B
• NaOH_(aq) C
• 2,4-dinitrophenylhydrazine reagent D

Dehydration of allcohol gives:

• Alkane A
• Alkene B
• Aldehyde C
• ketone D

K_bfor NH₄OH is 1.81 x 10^-5, then K_avalue of its conjugate base is

• 1.81 x 10⁺⁵ A
• 1.81 x 10^-9 B
• 5.5 x 10^-9 C
• 5.5 x 10^-10 D

The acid present in vinegar is

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

One calorie is equal

• 4.132 J A
• 760 J B
• 4.184 J C
• 1 J D

The number of atoms present in molecule determines its:

• Molecularity A
• Atomicity B
• Basicity C
• Acidity D

What will happen if LiAIH₄is added to an ester?

• Two units of alcohol are obtained A
• One unit of alcohol and one unit of acid is obtained B
• Two units of acids are obtained C
• None of these D

Which one of the following reaction takes place spontaneously

• 
  A
• 
  B
• 
  C
• 
  D

Plastics are a pollution problem because many plastics:

• Are made from petroleum A
• Are very inflammable B
• Burn to produce toxic fumes C
• Decompose to produce toxic products D

Which of the following is lighter

• Li A
• k B
• Na C
• Ca D

Substances that render enzymes catalytically inactive are called

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

IIB elements (Zn, Cd, Hg) and III B elements (Sc, Y and La) are

• Non typical transition element A
• Typical transition element B
• Normal elements C
• Inner transition element D

Evaporation of water is possible at:

• Above 100°C A
• 0°C B
• 100°C C
• At all temperature D

If a reactant or product of a reaction absorbs radiation, then physical method for determining the rate of reaction is

• Spectrometry A
• Refractometry B
• Conductivity measurement C
• Optical method D

Rusting of iron is catalysed by

• Fe A
• O₂ B
• Zn C
• H⁺ D

As compared to molar solution, in the molal solution the quantity of solvent is :

• Comparatively lesser A
• More or less equal B
• Comparatively greater C
• Very large D

The element caesium bears resemblance with

• Ca A
• Cr B
• Rubidium C
• None of the above D

The condition for standard enthalpy change is

• 1 atm 30°C A
• 1 atm 50°C B
• 1 atm 25°C C
• 760 atm 25°C D

The proteins which are derived by conjugated proteins are called as

• Simple protein A
• Complex protein B
• Derived protein C
• None D

Which of the following is a strong electrolyte?

• Ca(NO₃)₂ A
• HCN B
• CH₃COOH C
• NH₄OH D

Three sp²hybrid are co-planar at an angle of

• 104.5° A
• 109.5° B
• 107° C
• 120° D

B.O.D is connected with

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

A species having positive or negative charge is called:

• Electron A
• Ion B
• Proton C
• Atom D

Acylation of benzene to produce aliphatic aromatic ketones is known as:

• Friedel Craft's reaction A
• Benzene condensation B
• Hydroformylation C
• Cellemense
  D

Which gasoline is better?

• Of low boiling point A
• Of low molecular mass B
• Of high octane C
• All of these D

Alcohol reacts with halogen acid to produce

• Alkyl halides A
• Aldelydes B
• Ketones C
• Alkanes D

The catalyst,. which is used as specialist for cracking, are

• Aluminates A
• Alumlnosilicates B
• Aluminium slats C
• All can be used D

The next homologue of C₁₀H₂₂will be

• C₉H₂₀ A
• C₁₂H₂₆ B
• C₁₁H₂₄ C
• C₁₃H₂₈ D