ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

A nucleoside may be

• Ribonuleoside A
• Deoxyribonucleoside B
• Both a and b C
• None D

Burning of coal and hydrocarbon in air are examples of

• Non-spontaneous reaction A
• Spontaneous reaction B
• Natural reaction C
• Both b and c D

Which of the electronic configuration of nitrogen in correct?

• 1S²,2S²,2P¹,2P¹,2P¹ A
• 1S², 2S², 2P³ B
• 1S²,2S²,2P²,2P¹,2P² C
• 1S²,2S²,2P⁶,3S²,3P⁶ D

Which of the statement is contrary to the first law of thermodynamics

• Energy can neither be created nor destroyed A
• One form of energy can be transferred into an equivalent amount of other kinds of energy B
• In an adiabatic process the work done is independent of its path C
• Continuous production of mechanical work without supplying an equivalent amount of heat is possible D

The substance added in the paints for improving the mechanical properties is called

• Pigment A
• Filter B
• Stabilizer C
• Binder D

Which one of the following substance is use as decolonizing agent

• Asbestos A
• Animal charcoal B
• conc, H₂SO₄ C
• Silica gel D

Fungicides are the pesticides which

• Control the growth of fungus A
• Kill insects B
• Kill plants C
• Kill herbs D

Bakelite is obtained from phenol by reacting with

• Acetaldehyde A
• Acetal B
• Formaldehyde C
• Chlorobenzene D

Acetic acid is 1.33% ionized, In 1000 molecules of 0.1 M acetic acid the number of H⁺ions is

• 1.33 A
• 13.3 B
• 1.33 C
• 1 D

When a carbon atom forms single bonds with other carbon atoms, these hybrid orbitals overlap with the orbitals of hydrogen to form four bonds which are

• Three sigma and one P_i A
• Two sigma and two P_i B
• One sigma and three P_i C
• sigma D

Which is used as a coagulant:

• Ferric Salts A
• Potash alum B
• a and b both C
• Chlorine D

Compared to a 1.0M aqueous solution of calcium chloride will have

• The same freezing and boiling point A
• A lower freezing point and lower boiling point B
• A lower freezing point and higher boiling point C
• A higher freezing point and higher boiling point D

A transition metal complex can be recognized by various terms. Which is not the proper term

• Central metal ion A
• Coordination number B
• Ligand C
• Geometry of complex D

Which of the following will have the same number of molecules at STP ?

• 280 CM³ of CO² and 280 CM³ of N₂O

  A

• 11.2 dm3 of O₂ and 32 g of O₂

  B

• 44 g of CO₂ and 11.2 dm³ of CO

  C

• 28 g of N2 and 5.6 dm³ of oxygen

  D

Which oxide of nitrogen is obtained on heating ammonium nitrate at 250° C?

• Nitric oxide A
• Nitrous oxide B
• Nitrogen dioxide C
• Dinitrogen tetraoxide D

• Plank's equations A
• de Broglie's equations B
• Heisenburg's equation C
• None D

The elements with atomic numbers 9, 17, 35, 53, 85 an all

• Noble gases A
• Halogens B
• Heavy metals C
• Light metals D

The element with atomic number 55 belongs to which block of the periodic table

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

Eletronegativity difference in C-C bond in alkanes is:

• Zero A
• Double B
• Half C
• 4.0 D

The gases can be converted into liquids by

• increasing the pressure only A
• Lowering temperature and increasing pressure B
• Increasing pressure and bringing temperature below critical point C
• Lowering temperature only D

Which one of the following mixture shows positive deviation form Rault's law and forms an azetrope with minimum boiling point

• Methanol + CCI₄ A
• Methanol + acetone B
• Ether + HCI C
• Acetone + chloroform D

Heavy water is obtained by

• Prolonged electrolysis of water A
• Dissolving heavy salt in water B
• Simple distillation of water C
• Removing impurities of calcium and magnesium form water D

The example of a photo chemical reaction is photosynthesis has order of reaction :

• 1 A
• 2 B
• 0 C
• 3 D

The order of the rate of diffusion of gases NH₃,SO₂, CL₂, and CO₂ IS :

• NH_{3 >}SO_{2 >}CL_{2 >}CO₂ A
• NH_{3 >}CO_{2 >}SO_{2 >}CL₂ B
• CL_{2 >}SO_{2 >}CO_{2 >}NH₃ C
• NH_{3 >}CO_2>CL_{2 >}SO₂ D

Which of the following has highest oxidation potential

• Be A
• Li B
• Na C
• Ca D

Which of the following hydrogen halide is the weakest acid in solution?

• HF A
• HBr B
• Hl C
• HCl D

10g Of NaOH Has Been Dissolved Perdm³of solution. The morality of solution is :

• 0.025 M A
• 1.5 M B
• 0.1 M C
• .25 M D

What is the total number of different chloroethanes of formula C₂H_6-nCl_npossible (n may be 1 to 6)

• 6 A
• 8 B
• 9 C
• 10 D

Rutherford's atomic model suggests the existence of

• Atom A
• Nucleus B
• alpha particle C
• Measons D

Silk is an example of

• Animal fiber A
• Vegetable fibre B
• Mineral fibre C
• None of these D