ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The covalent bonds are

• Unidirectional A
• Bi-directional B
• Non-directional C
• Multi-directional D

What are non-metals?

• Sb & Bi A
• P & Bi B
• N & P C
• As & N D

How many moles of oxygen, O₂are needed for the complete combustion of two moles of butane C₄H₁₀?

• 2 A
• 8 B
• 10 C
• 13 D

The formula of calcium superphosphate is

• CaHPO₄ A
• CaH₂PO₄ B
• Ca(H₂PO₄)₂ C
• None of these D

Lime is often used as an agent:

• dehydrating A
• hydrating B
• oxidizing C
• reducing D

Alcohols of low molecular weight are

• Soluble in water A
• Soluble in water on heating B
• Insoluble in water C
• Insoluble in all solvents D

An artificial smell of banana is produced in many articles y using esters which of the following is that

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

Alkanes are least reactive towards:

• Acids and bases A
• Reducing agents B
• Oxidizing agents C
• All of these D

In incinerating the waste is burnt at

• 1000°C A
• 100°C B
• 2000°C C
• 1500°C D

Smallest particle of an element which may or may not have independent existence is known as:

• A molecule A
• An ion B
• An atom C
• An electron D

Ionization energy does not increase?

• With small atomic radius of atom A
• If increase in no of electronic shells B
• By increase in proton no of atom C
• None of these D

The number of bonds in nitrogen molecule is

• Oneφ and one π

  A

• Oneφ and two π

  B
• three sigma only C

• Two φ and one π

  D

Amylacetate flavour is present in:

• Banana A
• Apple B
• Jasmine C
• Orange D

Preparation of vegetable ghee involves:

• Halogenation A
• Hydrogenation B
• Hydroxylation C
• Dehydrogenation D

Which of the following reactions occur at moderate rate :

• Rusting of iron A
• Chemical weathering of stone work of buildings by acidic gases in atmosphere. B
• Hydrolysis of an ester C
• Fermentation of sugars D

Compounds having the same molecular formula, but different functional groups show

• Metamerism A
• Position isomerism B
• Chain isomerism C
• Functional group isomerism D

• Iodine can oxidise iron A
• Bromine can oxidise iron B
• Iodine can oxidise bromine C
• Iron can oxidise bromine D

The oxidation state of Fe in [Fe(CN)₆]^3-is

• +2 A
• +3 B
• +4 C
• -3 D

The general formula of amino acids is

• 
  A
• 
  B
• 
  C
• 
  D

Interstitial compounds have

• Half formula A
• Fixed formula B
• Indefinite formula C
• None D

Which of the following isoelectronic ions has the lowest ionization energy?

• K⁺ A
• Ca²⁺ B
• Cl^- C
• S^2- D

Acetal is produced by reacting alcohol in the presence of dry HCl with

• Acetaldehyde A
• Ketone B
• Ether C
• Carboxylic acid D

The main pollutant of leather tanneries in the waste is due to the salt of:

• lead A
• Chromium (VI) B
• Copper C
• Chromium (III) D

If pH of buffer of 1 mole dm^-3of HCOOH + 0.1 mole dm^-3HCOONa having pKa = 3.78 is

• 1.78 A
• 2.78 B
• 3.78 C
• 4.78 D

• N₂O₄is limiting reactant A
• N₂H₄is the limiting reactant B
• Reactants are completely converted to the products C
• Reactions is reversible D

The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is

• Iodide > bromide > chloride A
• Chloride > bromide > iodide B
• Bromide > chloride > iodide C
• Bromide > iodide > chloride D

• Moles per dm³ A
• Partial pressures B
• Number of moles C
• Mole fractions D

Angle 120° is observed in molecules :

• CH₄ A
• CH_3-CH₃ B
• CH -CH C
• CH_{2 =}CH₂ D

Which of the following is directly related with entropy

• Pressure A
• Degree of freedom B
• Temperature C
• Both b and c D

Which is a weak nucleophile

• OH^- A
• Br^- B
• NH₃ C
• CI^- D