ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Oxidation of 2-propanol gives

• Propanone A
• Butanone B
• Pentanone C
• None of these D

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

• Primary pollutant A
• Secondary pollutant B
• Tertiary pollutant C
• None of these D

Esters have peculiar smell, which of the following is used as an essence of orange

• Isoamyl acetate A
• Iosamyl valerate B
• Octyl acetate C
• Methyl butyrate D

• 1-bromobutane A
• 2-bromobutane B
• 1-bromo-2-methyl propane C
• 2-bromo-2-methyl propane D

______ gives peroxide

• Li A
• Ba B
• Sr C
• Be D

Sodium forms largely

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

Shielding effect intervening electrons causes

• Decreases in atomic radii in a period from right to left A
• Increase in atomic radii in a period from left to righ t B
• Decrease in atomic radii down the group C
• Increase in atomic radii down the group D

Elimination bimolecular reactions usually obey

• First order kinetics A
• Second order kinetics B
• Third order kinetics C
• Zero order kinetics D

Butyric acid was named from butyrum means:

• Red out A
• Vinegar B
• Butter C
• Milk D

Coupling of Pb with its Pb⁺⁺/Pb = -0.13 V and Ag with Ag⁺/ Ag = +0.80 V, the cell reaction

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following elements have the largest radius

• F A
• Cl B
• Br C
• l D

The number of isotopes of gold is

• 3 A
• 1 B
• 2 C
• 4 D

The strongest forces are

• Debye forces A
• London dispersion forces B
• Dipole-dipole attraction C
• Hydrogen D

Which for the following has no dipole moment

• HCI A
• H₂S B
• H₂O C
• CO₂ D

The toxic organic compounds and heavy metals and metalloids results in contamination of

• Surface water A
• Ground water B
• Both surface and ground water C
• Neither surface nor ground waters D

The amount of solute present in the given amount of solvent is called

• Molarity A
• Molality B
• Concentration C
• Solubility D

Alkyl halides on treatment with aqueous KOH give

• Phenol A
• Alcohol B
• Aldehyde C
• Ketone D

Azimuthal quantum number of last electron of ₁₁Na is

• 1 A
• 2 B
• 3 C
• 0 D

0.5 M of H₂SO₄is diluted from 1 litre to 10 litre, normality of resulting solution is

• 1 N A
• 0.1 N B
• 10 N C
• 11 N D

• Alkyl A
• Alkyl nitrile B
• Cyanogens C
• Amine D

Which is the used as test for the presence of alkenes

• Reaction of cold dilute alkaline KMnO₄ A
• Combustion B
• Polymerization C
• Catalytic hydrogenation D

According to the SI-system heat contents are measured in units of

• Calorie A
• Joules B
• Ergs C
• Watts D

Of the given alkali metals, the one with smallest size is

• Rb A
• Cs B
• K C
• Na D

An alcohol with molecular formula C_nH_2n+1OH has a chiral carbon atom but does not react with MnO^-₄/H⁺what is the least number of carbon atoms such an alcohol could possess

• 5 A
• 6 B
• 7 C
• 8 D

(CH₂O)_nis general formula for

• Monosaccharides A
• Oiligosaccharides B
• Polysaccharides C
• None of these D

Alkali metals react violently with halogens to form

• Hydrides A
• Halides B
• Anyhydrides C
• None of these D

The sun of all the energies of atoms, molecule, ion, within system is called

• Enthalpy A
• K.E. of the system B
• Internal energy C
• None D

For a given process, the heat changes at constant volume ( q_v)are related to other as:

• q_p= q_v

  A

• q_p<q_v

  B

• q_p>q_v

  C

• q_p=q_v/2

  D

Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is

• C₃H₄O₃ A
• C₂H₄O₃ B
• C₃H₅O₄ C
• C₂H₃O₁ D

Hydrocarbon which is liquid at room temperature is

• Pentane A
• Butane B
• Propane C
• Ethane D