ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following molecules has zero dipole moment>

• H₂O A
• CHCl₃ B
• BF₃ C
• NH₃ D

• Acidified AgNO_3(aq) A
• Fehling's solution B
• Na C
• Na₂XO_3(aq) D

The strongest acid is

• HF A
• HCl B
• HBr C
• HI D

75% plant nutrients are present in the fertilizer

• urea A
• NH₄NO₃ B
• NH₃ C
• (NH₄)₂HPO₄ D

Neutrons was discovered by

• Mosely A
• Milliken B
• Chadwick C
• Ruherford D

Which is independent of temperature

• Molarity A
• Molality B
• Normality C
• Mole fraction D

The empirical formula of a compound is CH₂O. What may be the compound

• C₂H₅OH A
• C₆H₅OH B
• HCOOH C
• 
  D

Alkali metals in each period have

• Smallest size A
• Lowest IE B
• Highest IE C
• Highest electronegativity D

Macromolecules or polymers are large molecules built up from small molecules called monomers. This hypothesis put forward by

• Schrodixger A
• Standinger B
• Lewis C
• Newton D

Coinage metals like Au, Pt, Ag and Cu are the least reactive metals and don't liberate H₂gas when treated with acids because

• These have very high positive values of reduction potentials A
• These have very high negative values of reduction potentials B
• Their ionization potentials are lowest C
• Their reduction potentials are close to SHE D

Lower carboxylic acids are soluble in water due to

• Low molecular weight A
• Hydrogen bonding B
• Dissociation into ions C
• Easy hydrolysis D

The only non-metal in liquid form is

• S A
• Cl B
• Br C
• P D

The energy absorbed when an electron is added to a gaseous atom to form a gaseous ion is called

• Electron affinity A
• Ionization energy B
• Both of these C
• None of these D

Ammonium nitrate fertilizer is not used for which crop

• Cotton A
• Wheat B
• Sugar cane C
• Paddy rice D

Baukelite is a polymer obtained from two monomers

• Phenol and ethanol A
• Phenol and methanol B
• Phenol and methanal C
• Phenol and acetone D

Hydrolysis of Grignard's reagent yields

• Alcohol A
• Aldyhyde B
• Ester C
• Alkane D

95% ethanol is called:

• Rectified other A
• Diesel B
• Rectified spirit C
• Petrol D

The ph of 10-3 mole dm-3 of an aqueous solution of H₂SO₄ is :

• 3.0

  A

• 2.7

  B
• 2.0 C

• 1.5

  D

In an alkaline battery the anode, the cathode and electrolyte are respectively.

• Manganese dioxide, Zinc, sodium hydroxide A
• Zinc, Manganese dioxide, Sodium hydroxide B
• Zinc, manganese dioxide, potassium hydroxide C
• Manganese dioxide, zinc, potassium hydroxide D

Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

• Sulphur is present in the mixture as impurity A
• IV group radicals are precipitated as sulphides B
• Of the oxidation of H₂S gas by some acid radicals C
• III group radicals are precipitated as hydroxides D

The electrophile in aromatic sulphonation is

• H₂SO₄ A
• HSO₄ B
• SO₃ C
• SO₃⁺ D

0.1 MHCI has pH = 1.0, it is about 100 times stronger than acetic acid. Then pH of acetic acid will be

• 0.1 A
• 2.0 B
• 1.3 C
• 3.0 D

The atom other than C in a hetrocyclic compound is called as

• Hetroatom A
• Hetroion B
• Hetromolecule C
• Hetroelement D

Which of the following statements is true about Galvanic cell

• Anode is negatively charged A
• Reduction occurs at anode B
• Cathode is positively charge C
• Reduction occurs at cathode D

The molarity of the solution containing x grams (NH₄)₂SO₄in 500 cm³of the solution is 0.6 what is x

• 39.6 A
• 45.1 B
• 40.5 C
• 42.7 D

Factor which slows down the rate of reaction is

• Small size of the particles of the reactant A
• High temperature of reaction B
• More concentration of reactant C
• Lowering the temperature D

The negatively charged particles are called

• Cation A
• Radical B
• Anion C
• Positron D

Out of all the elements of group VI-A the highest melting and boiling points is shown by the elements:

• Te A
• Se B
• S C
• Pb D

During the mechanism of aldol condensation a/an ______ is formed

• Oxide A
• Alkali B
• Alkoxide ion C
• None of these D

The reaction of alcohol with SOCI₂in the presence of pyridine as catalyst gives

• Acids A
• Acid chloride B
• Alkyl halide C
• Benzene D