ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The value of K_pis greater than K_cfor a gaseous reaction when

• Number of molecules of products is greater than the reactants A
• Number of molecules of reactants is greater than those of products B
• Number of molecules of reactants and products equal C
• Catalyst is added D

Carboxylic acids on complete reduction in the presence of Hi and red phosphorus gives:

• Esters A
• Alcohols B
• Alkanes C
• Aldehydes D

Of the following which is a step growth polymer

• Bakelite A
• Polyethylene B
• Teflon C
• PVC D

• 0.12 A
• 0.50 B
• 0.25 C
• 4.00 D

The radius of first orbit of hydrogen atom

• 0.329 A° A
• 0.429 A° B
• 0.529 A° C
• 0.229 A° D

Size of an anion is increased as compared to its atom because of the

• Addition of new shell A
• Repulsion of electrons in the valence shell B
• Decrease in nuclear charge C
• Increase in the unclear charge D

Bronze is an alloy which contains

• 60% cu A
• 70% cu B
• 80% cu C
• 99% cu D

All elements of group VI-A non-metal except

• Te A
• S B
• Se C
• Po D

Which is the formula of tetra-ammine chloronitro platinum (VI) sulphate?

• [Pt(NH₃)₄(NO₂)]SO₄ A
• [PtNO₂Cl(NH₃)₄]SO₄ B
• [PtCl(NO₂)(NH₃)₄]SO₄ C
• [Pt(NH₃)₄(NO₂)Cl]SO₄ D

Solutions with same osmotic pressures are called

• Hypertonic A
• Hypotonic B
• Isotonic C
• Normal D

Which of the following is correct?

• Reduction of any aldehyde gives secondary alcohol A
• Reaction of vegetable oil with H₂SO₄gives glycerine B
• Alcoholic iodine with NaOH gives iodoform C
• Sucrose on reaction with NaCl gives invert sugar D

Commercial common salt becomes slight damp on storing because

• Common salt is hygroscope A
• Common salt contains some impurity, which is hygroscopic B
• Salt in efflorescent C
• Salt is crystalline D

Variable valency is generally exhibited by

• Normal elements A
• Transition elements B
• Metallic elements C
• None of these D

Which of the following elements is most electronegative?

• Oxygen A
• Chlorine B
• Nitrogen C
• Fluorine D

The radius of ion while considering it to be spherical in shape is called:

• Covalent radii. A
• Atomic radii. B
• Ionic radii. C
• Both (a) and (C). D

The common reagent used in oxidation of Alcohols is.

• K2Cr2O7 A
• K2CrO4+H2SO4 B
• H2SO4 C
• K2Cr2O7+ H2SO4 D

• RCH(CH₃)CO₂H + CH₃OH A
• RCH(CH₃)CO₂H + HCO₂H B
• RCH(CH₃)OH + CO₂ C
• RCH(CH₃)OH + HCO₂H D

A suitable solvent should dissolve maximum amount of solute at its boiling point and minimum amount at :

• Freezing point. A
• Room temperature. B
• Boiling point. C
• Sea level temperature. D

In the particular reaction for the valueK_{c 1 x}10^-25which statement is correct :

• Almost forward reaction is completed. A
• Amount of reactant is negligible as compared to product. B
• Amount of product is negligible as compared to reactant. C
• Amount of product is equal to amount of reactant. D

In an exothermic reaction, a 10° rise in temperature will

• Decrease the value of equilibrium constant A
• Double the value of K_c B
• Not produce any change in K_c C
• Produce some increase in K_c D

Organic compounds resemble to those of inorganic compounds having same

• Ionic properties A
• Carbon forming long chain or rings B
• Chemical forces C
• Isomerism D

Which one of the following pentafluorides cannot be formed?

• PF₅ A
• AsF₅ B
• SbF₅ C
• BiF₅ D

Ammonia like water also reacts with Grignard's reagent to give

• Alkane A
• Alkene B
• Alkyne C
• Amide D

The mass of Al₂S₃formed when 20 grams Al reacts completely with S is

• 60 g A
• 50 g B
• 50.55 g C
• 55.55 g D

In molecules kinetic and potential energies are:

• Definite A
• Moderate B
• Indefinite C
• None of above D

Which of the following statement about electron affinity of two elements is correct

• Carbon has greater than oxygen A
• Sulphur has less than oxygen B
• Iodine has greater than bromine C
• Bromine has less than chlorine D

Complete combustion of alkane yields

• CO₂+ H₂O A
• CO₂+ heat B
• CO + H₂O heat C
• CO₂+ H₂O + heat D

The geometrical shape of a transition complexion is related to the state of hybridizing of the central atom. What is trigonal bipyramidal

• sp³ A
• dsp² B
• dsp³ C
• d²sp³ D

The element which has a simple cubic lattice in solid state is

• Se A
• Te B
• Po C
• None of these D

• It decolourises aqueous bromine rapidly A
• It is insoluble in water B
• It reduces Fehling's reagent C
• Two molecules react with each other in the presence of a strong acid D