ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The total number of inner transition elements in the periodic table is

• 10 A
• 14 B
• 28 C
• 30 D

The sample being analyzed is called

• Electrolyte A
• Substance B
• Analyte C
• All of above D

Easter are pleasant smelling compounds. Which ester posseses odour like pineapple

• Amylacetate A
• Amylbutyrate B
• Ethylbutyrate C
• Benzylacetate D

The only forces are London dispersion forces among the

• Atoms of He in gaseous state at high temperature A
• Molecules of water in liquid state B
• Molecules of solid I₂ C
• Molecular of hydrochloric acid gas D

On the basis of VSEPR theory SO₂is a

• Liner molecule A
• A bent molecule B
• A strong molecule C
• A gaseous molecule D

The energy units in which heat changes usually expressed in Sl-system are:

• Joule. A
• Calorie. B
• Kilo Joule. C
• Both (a) and (c) D

Transition metals form complexes due to the participation of partially filled

• f-orbitals A
• d-orbitals B
• s-orbitals C
• p-orbitals D

The change in concentration of reactant or product per unit time is called :

• Rate constant. A
• Rate of reaction. B
• Rate equation. C
• Rate law. D

In Boyle's law which of the following pair remains constant :

• Temperature and quality of a gas. A
• Pressure and quality of a gas. B
• Temperature and pressure C
• Temperature and quantity of a gas. D

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

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

Evaporation of water is possible at:

• Above 100°C A
• 0°C B
• 100°C C
• At all temperature 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

The coordination number of iron in [Fe(H₂O)₆]³⁺is

• 2 A
• 3 B
• 4 C
• 6 D

Spectrum of white light is continuous becuase

• Colors separated by dark spaces A
• There are no boundary lines between the colours B
• The radiations are in infrared region C
• The radiatins fall in ultraviolet region D

Which one of the following metal ions is colourless?

• V²⁺ A
• Cr³⁺ B
• Zn²⁺ C
• Ti³⁺ D

Which is possible in ethers?

• Reactivity high A
• Oxidation and reduction B
• Reactivity towards bases C
• Towards acids D

Forms of waste products :

• Heat A
• Smoke B
• Solid C
• All of these D

When benzene is burnt in free supply of air, it is completely oxidized to

• CO A
• CO₂₊H₂O B
• H₂CO₃ C
• None D

Basicity of orthoposphoric acid is

• 2 A
• 3 B
• 4 C
• 5 D

• 2 A
• 3 B
• 4 C
• 9 D

Besides Zn and Cu , German silver contains the metal

• Sn A
• Ag B
• Ni C
• Mg D

Ethylene polymerizes at 100 atm pressure and 400°C to give

• Polybenzene A
• Polyalcohol B
• Polypropylene C
• Polyethylene D

Reactions that proceed on both sides and never go to completion are called

• Irreversible reactions A
• Reversible reactions B
• Opposing reactions C
• Spontaneous reactions D

If Grignard reagent is allowed to react with another alkyl halide the main product is

• An alkane A
• Cyclo alkane B
• Alkyne C
• An alkene D

Which three elements are needed for the healthy growth of plants?

• N, S, P A
• N, Ca, P B
• N, P, K C
• N, K, C D

The addition of a catalyst to a reaction changes the

• Enthalpy A
• Entropy B
• Nature of reactants C
• Energy of activation D

2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is

• 2-Ethoxypentane A
• Pent-1-ene B
• cis-Pent-2-ene C
• trans-Pent-2-ene D

which of the following has smaller size:

• Fe+³

  A

• Fe+²

  B

• Fe+¹

  C

• Fe

  D

The relative lowering of vapour pressure is equal to the mole fraction of the solute is statement of

• Rault law A
• Henry law B
• Dalton law C
• Grahms law D

Which is the strongest acid?

• HClO A
• HClO₂ B
• HClO₃ C
• HClO₄ D