ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

CO₂absorber used in breathing tanks is

• K₂O₂ A
• K₂O B
• KO₂ C
• Na₂O₂ D

Polypeptide chains are coiled about one another into a spiral by

• Ionic bonds A
• Covalent bonds B
• Van der Waal's forces C
• Hydrogen bonds D

Group VI-A elements are called:

• Halogens A
• Electron deficient B
• alkaline earth metal C
• Chalcogens D

Which of the following transition metal ions will have definite value of magnetic moment?

• Se³⁺ A
• Ti³⁺ B
• Cu⁺ C
• Zn²⁺ D

Which statement is true about a free radical

• An atom with a positive charge A
• An atom with a negative charge B
• An atom with a lone pair of electrons C
• An atom with unpaired electron D

Fatty acids are:

• Allphatic monocarboxylic acids A
• Dicaroxylic acids B
• Tricarboxylic acids C
• Tetracarboxylic acids D
• Poly carboxylic acids E

Which of the following hydrides has the lowest boiling point?

• H₂O A
• H₂S B
• H₂S3 C
• H₂Te D

Splitting of spectral lines when atoms are subjected to strong electron field is called

• Zeeman effect A
• Stark effect B
• Photoelectric effect C
• Compton effect D

Common names of carboxylic acids are given by then:

• Source A
• Person discovered B
• place C
• habit D

Which enzyme is not involved in fermentation of strach

• Diastase A
• Zymase B
• Urease C
• Invertase D

Addition of iron fillings to CuSO₄solution caused precipitation of Cu owing to the

• Reduction of Cu²⁺ A
• Oxidation of Cu²⁺ B
• Reduction of Fe C
• Reduction of Fe³⁺ D

Which is not true with respect to cathode rays?

• A stream of electrons A
• Charged particles B
• Move with speed as that of light C
• Can be deflected by magnetic fields D

A limiting reactant is the one which

• Is taken in lesser quantity in grams as compared to other reactants A
• Is taken in lesser quantity in volume as compared to other reactants B
• Gives the maximum amount of the product which is required C
• Gives the minimum amount of the product under consideration D

I₂O₅is used for quantitative study of

• CO₂ A
• NO₂ B
• NO C
• CO D

The oxyacids of phosphorus in which phosphorus has the lowest oxidiation state is

• Hypophosphorus acid A
• Orthophosphorus acid B
• Pyrophosphorus acid C
• Metaphosphorus acid D

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

During electrolysis, electrons are :

• Lost by anions and gained by cations A
• Gained by anions and lost by cations B
• Gained only C
• Lost only D

The molal elevation constant is the ratio of the elevation in boiling point to

• Molarity A
• Molality B
• Mole fraction of solute C
• Mole fraction of solvent D

Which are used as essences(flowers)?

• aldehydes A
• Ketones B
• alcohols C
• esters D

The open chain organic compounds are called

• Linear compounds A
• Aromatic B
• Aliphatic C
• Both A and B D

Which has complete valence shell?

• C A
• N B
• O C
• Ne D

Which of the following solution have zero pH

• 1 M HCI A
• MH₂SO₄ B
• 0.1 M HNO₃ C
• 1 M CH₃COOH D

Number of molecules in one dm³ of water is close to :

• 6.02/22.4

  
  

  A

• 12.04/22.4 *10²³

  
  

  B

• 18/22.4*10²³

  C

• 55.6*6.02*10²³ * 10²³

  D

Micro-nutrients are required in quantity ranging form:

• 4g-40g A
• 6g-200g B
• 6kg- 200 kg C
• 4kg- 40kg D

• KC = KP A
• Kp = KcRT B
• Kp = kc(RT)^-2 C
• Kp = Kc(RT)^-1 D

• 
  A
• 
  B
• 
  C
• 
  D

Metals which are above SHE in electrochemical series

• Can liberate H₂from acid A
• Cannot liberate H₂from acid B
• Cannot always liberate H₂from acid C
• None of these D

Phenol is also known as

• Acetic acid A
• Carbolic acid B
• Tararic acid C
• Trichloroacetic acid D

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

• Gas molecules collide with anode A
• Gas molecules are at high temperature B
• Gas molecules produce X-rays C
• Cathode rays remove electrons from gas molecules D

Ethanol can be converted into ethanoic acid by

• Hydrogenation A
• Hydration B
• Oxidation C
• Fermentation D