ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which fills the space between needles in cement setting?

• Ca(OH)₂ A
• Al(OH)₃ B
• CaCO₃ C
• MgSO₄ D

A cell in which spontaneous redox reaction generates an electric current is called

• Electrolytic cell A
• Electrochemical cell B
• Voltaic or Galvanic cell C
• Biological cell D

Acetic Acid is obtained from:

• Red out A
• Vinegar B
• Butter C
• Milk D

Oxidation state of an element in free state is:

• Its numebr of elemtrons lost A
• Its number of electrons gained B
• zero C
• Its number of electrons shared D

Direct conversion of solid into vapors is called :

• Crystallization A
• Sublimation B
• Obligation C
• Vaporization. D

Besides Zn and Cu , German silver contains the metal

• Sn A
• Ag B
• Ni C
• Mg D

Homologues differ from each other by an integral number of

• CH₂groups A
• CH₃groups B
• CH groups C
• CH₄groups D

The rate of reaction b/w two specific time intervals is called :

• Instantaneous rate of reaction. A
• Average rate of reaction. B
• Rate of a reaction. C
• Minimum rate of a reaction. D

Which of the following is not a fertilizer

• Nitrophos A
• Dolomite B
• Super phosphate of lime C
• Urea D

The ore CaSO₄2H₂O has the general name

• Gypsum A
• Dolomite B
• Calcite C
• Epsom salt D

Laughing gas is chemically

• NO A
• N_2O B
• NO₂ C
• N₂O₄ D

If the radius of first Bohr orbit be a_o, then the radius of third Bohr orbit would be

• 3 x a_o A
• 6 x a_o B
• 9 x a_o C
• 1/2 x a_o D

A transition element is defined as an element of 3d series

• Which is metal A
• Which has one stable ion B
• Which has two stable ions C
• Which has at least one stable ion with incomplete d-orbital D

Half life of most stable isotope of astatine is

• 8.0 hrs A
• 8.1 hrs B
• 8.2 hrs C
• 8.3 hrs D

Which of the following equations represents the action of heat on NaHCO₃

• 
  A
• 
  B
• 
  C
• 
  D

Which one of the following properties is not correct for ozone?

• It oxidizes lead sulphides A
• It oxidizes potassium iodide B
• It oxidizes mercury C
• It cannot act as a bleaching agent D

The ionic product of H⁺ions and OH^-in water is called ionization constant of water Kw. The value of Kw at 25°C is

• 0.11 x 10^-14 A
• 0.30 x 10^-14 B
• 1.0 x 10^-14 C
• 3 x 10^-14 D

Electron affinity of sulphur is

• More than O and Se A
• More than O but less than Se B
• Less than O but more than Se C
• Equal to O and Se D

According to Boyle's law, which parameters give a straight line parallel to axis-s, when we plot a graph between:

• V and T A
• P and V B
• P and 1/V C
• P and PV D

The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration, K equilibrium is

• 0.5 A
• 1.5 B
• 2.5 C
• 2.0 D

Forms of waste products :

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

Which is in differnet phase form other metals

• Ni A
• Hg B
• Cd C
• Na D

Keeping in view the size of atoms, which order is the correct one

• Mg > Sr A
• Ba > Mg B
• Lu > Ce C
• Cl > l D

Terylen fibre is made by reaction of terephthalic acid with

• Ethylene A
• Ethylene glycol B
• Glycol C
• Terylene D

Which statement is incorrect about standard hydrogen electrode

• Its oxidation and reduction potential is zero A
• It consists of Pt wire dipped on 1 molar HCI solution B
• The electrolyte is 1 molar NaOH solution C
• H₂gas is passes in it at 1 atmospheric pressure D

• Elimination Esterification A
• Elimination Isomerisation B
• Oxidation Exterification C
• Oxidation Oxidation D

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

• dxy A
• dxz B
• dz² C
• dx²- y² D

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

• low ionization energy of sodium A
• sublimation of metallic sodium to give yellow vapour B
• emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region C
• photosenitivity D

Which of the following compounds contains a triple bond?

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

The structure of benzene is

• Hexagonal A
• Pyramidal B
• Square planer C
• Tetrahedral D