ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which ion will have the maximum value of heat of hydration?

• Na⁺ A
• Cs⁺ B
• Ba⁺ C
• Mg⁺² D

The art of electroplating was given by

• Faraday A
• Edison B
• Thomas Gradam C
• Brugan D

In macromolecules DP stands for

• Dissociation parameter A
• Dissociation polymer B
• Degree of polymerization C
• None of these 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

The cement plants in west Pakistan at the time of creation were

• ten A
• twenty two B
• four C
• twenty four D

The velocity of photon is:

• Independent of its wavelength. A
• Depends on its wavelength. B
• Equal to square of its amplitude C
• Depends on its source. D

• -1.10 V A
• +1.10 V B
• -0.42 V C
• +0.42 V D

Which of the following statements is no correct regarding bonding molecular orbitals?

• Bonding molecular orbitals possess ls energy than atomic orbitals from which they are formed. A
• Bonding molecular orbitals have low electron density between the two nuclei. B
• Every electron in bonding molecular orbitals contributes to the attraction b.w atoms. C
• Bonding molecular orbitals are formed when the electron waves undergo constructive interference. D

Colour of N₂O₄ is

• Raddish brown A
• Yellow B
• Colouries C
• green D

In CH₄, all the H-C-H bond angles are

• 120° A
• 107° B
• 109° C
• 109.5° D

Which compound on reaction with hydrogen cyanide produces a compound with a chiral centre

• Ch₃CHO A
• CH₃CH₂COCH₂CH₃ B
• CH₃CO₂CH₃ C
• HCHO D

Which is mild oxidizing agent ?

• Tollen's reagent A
• KMnO₄ / H₂SO₄ B
• K₂Cr₂O₇ / H₂SO₄ C
• HNO₃ D

What is wrong about transition metals?

• Diamagnetic A
• Paramagnetic B
• Form complexes C
• Shows variable oxidation state D

The addition of HBr is easiest with

• CH2 = CHCl A
• CICH = CHCl B
• CH3 - CH = CH2 C
• (CH3)2 C = CH2 D

Fluted filter paper is used to :

• Decrease rate of filtration. A
• Increase rate of filtration. B
• Maintain rate of filtration. C
• None of above. D

Amongst the following, the compound that can be most readily sulphonated is:

• Toluene A
• Benzene B
• nitrobenzene C
• chlorobenzene D

An azeotropic mixture showing it's positive deviation from Raoult's law, the volume of the mixture is :

• Slightly more than the total volume of the components. A
• Slightly less than the total volume of the components. B
• Equal to the total volume of the components. C
• None of these. D

The polymers which can be re-softened again and again are caled

• Thermoplastic A
• Thermosetting B
• Both a and b C
• None D

In a compound an atom has negative oxidation state because

• Atom is negatively charged A
• Atom acts as cathode B
• Atom is more electronegative C
• Atom has lowest ionization energy D

Ionic solids are characterized by :

• Low meeting points A
• Good conductivity in solid state B
• High vapor pressure C
• Solubility in polar solvents D

Hydration energy depends upon:

• Change of Ion A
• Size of Ion B
• Charge to size ratio C
• Heat changes D

Which catalyst is used in contact process?

• Fe₂O₃ A
• V₂O₅ B
• SO₃ C
• Ag₂O D

DNA has deoxyribose, a base and the third component is

• Phosphoric acid A
• Ribose B
• Adenine C
• Thymine D

Tincal is a mineral of:

• Al A
• B B
• Si C
• C D

Water H₂O is liquid while hydrogen sulphide H₂S is a gas beause

• Water has higher molecular weight A
• Hydrogen sulphide is a weak acid B
• Sulphure has high electronegativity than oxyhe C
• Water molecules associate through hydrogen bonding 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

Which is used to remove air bubbles form metals?

• B A
• Be B
• Mg C
• Al D

Selection of filter paper depends upon sizes of particles to be :

• Tested. A
• Filtered. B
• Checked. C
• All of above. D

If we remove one hydrogen atom from an alkane we obtain a group called

• Acetyle group A
• Formyle group B
• Alkyle group C
• Ketyle group D

Platinum (IV) chloride combines with ammonia to form compounds in which the coordination number of the platinum is 6. A formula unit on one of the compound contains a cation and only two chloride ions. What is the formula of this compound

• Pt(NH₃)₆CI₄ A
• Pt(NH₃)₅CI₄ B
• Pt(NH₃)₄CI₄ C
• Pt(NH₃)₃CI₄ D