ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which woody raw material is used for the manufacture of paper pulp?

• cotton A
• Bagasse B
• Popular C
• Rice straw D

Alkanes have functional group :

• ----X A
• --OH B
• ----COH C
• No functional group D

Which of the following is weakly acidic in nature

• Alcohol A
• Phenol B
• Aidehyde C
• Amide D

Acidic soils are neutralized by adding:

• Plaster of paris A
• Brine B
• Lime C
• Milk of magnesia D

In the electrolysis of aqueous solution of sodium nitrate, the ions which are reduced at the cathode are

• H₃O⁺ A
• Na⁺ B
• OH^- C
• NO^3- D

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

• 4 A
• 5 B
• 6 C
• 7 D

Li has the lowest reduction potential while the element with highest reduction potential is

• H A
• F B
• O C
• N D

Which of the following in incorrect?

• FelCl₃is used in the detection of phenols A
• Fehling solution is used in the detection of glucose B
• Tollen's reagent is used in detection of unsaturation C
• NaHSO₃is used in the detection of carbonyl compounds D

Out of Cu, Ag, Fe and Zn the metal which can displace all others from theri salt solution is

• Ag A
• Cu B
• Zn C
• Fe D

Which one is the major reason for pollution in high cities?

• Fossil fuel A
• Acid rain B
• Heat dispersion C
• None of the above D

The chemical formula of magnesite is

• MgCl₂ A
• Mg(HCO₃)₂ B
• MgCO₃ C
• None of these D

Energy of electron in first orbit of H atom is

• -45.32 KJ/mole A
• -82.08 KJ/mole B
• -52.53 KJ/mole C
• -1313.31 KJ/mole D

Which of the following compounds will not react with sodium metal to release hydrogen

• CH₃CH₂CH₃ A
• CH₃CH₂OH B
• C₆H₅OH C
• C₆H₅CH₂OH D

The branch of chemistry which deals with thermal energy changes in chemical reactions is called

• Chemical kinetic A
• Thermodynamics B
• Thermochemistry C
• Mechanics D

Boyle's law does not fall even

• Temperature is extremely high A
• Pressure is extremely high B
• Mixture of gases is taken C
• all of above D

The most stable phosphorus allotrope is

• White A
• Red B
• Black C
• All D

A single chlorine free radical can destroy how many ozone molecules

• 100 A
• 100000 B
• 10000 C
• 10 D

Water pollution is mainly due to

• Sulphure dioxide A
• Carbon dioxide B
• Oxygen C
• Industrial discharges D

Substances that tend to decrease the activity of enzymes are called

• Coenzyme A
• Activators B
• Inhibitors C
• Apoenzyme D

The conversion of n-hexane into benzene by heating in the presence of Cr₂O_{3 is called:}

• Isomerization A
• Aromatization B
• Dealkylation C
• Rearrangment D

Aspirin is

• Acetyl salicylic acid A
• Phenyl salicylic acid B
• Salicylic acid C
• Benzoic acid D

The unit of rate constant K ismole^-1 dm³for a chemical reaction, the order of reaction is :

• Order of reaction can determined by an experiment A
• Order of reaction can determined from a balance equation only. B
• Order of reaction can determined increases by increasing temperate. C
• Order of reaction must be in whole number and not in fraction. D

Which compound is both chiral and acidic

• 
  A
• 
  B
• 
  C
• 
  D

• 0.073 A
• 0.147 B
• 0.05 C
• 0.026 D

The acid present in the stings of bees and wasps in

• Acetic acid A
• Formic acid B
• Formalin C
• Formaldehyde D

Extent to H₂ + L₂ à2Hl can be increased by :

• Increasing temperature.

  A

• Increasing product.

  B

• Increasing pressure.

  C

• Adding a catalyst.

  D

What is the packet of energy called?

• Electron A
• Photon B
• Positron C
• Proton D

Which of the following liquid pairs shown a positive deviation from Raoult's law

• CH₃COOH₃+ CH₃CI A
• C₆H₆+ CH₄OH B
• H₂O + HCI C
• H₂O + HNO₃ D

Dehydration of allcohol gives:

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

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

• Paschen A
• Pfund B
• Balmer C
• Brackett D