ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Equal volumes of 0.1 M AgNO₃and 0.2 M NaCl are mixed. The concentration of NO^-₃ ions in the mixture will be

• 0.1 M A
• 0.05 M B
• 0.2 M C
• 0.15 M D

Which of the following is the most suitable method for removing the traces of water from ethanol?

• Reacting with Na metal A
• Passing dry HCl through it B
• Distilling it C
• Reacting with Mg D

Specific gravity of HNO₃ is

• 1.35 A
• 1.53 B
• 1.39 C
• 1.93 D

With amino acids ninhydrin solution gives

• Blue A
• Violet B
• Bluish violet C
• White D

During electrolysis of KNO₃, H₂is evolved

• Anode A
• Cathode B
• Both a and b C
• None D

[Co(NH₃)₆]³⁺will form ______ structure

• Square planar A
• Tetrahedral B
• Octahedral C
• Trigonal bipyamidal D

How many atoms of carbon are there in 18 g of C6H12O6?

• 6.02 x 10²³ A
• 3.6 x 10²³ B
• 6.02 x 10²² C
• 3.6 x 10²² D

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

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

Which one is not a pollutant normally?

• Hydrocarbons A
• Carbon dioxide B
• Carbon monoxide C
• Sulphur dioxide D

An ion bearing positive charge is called:

• Cation A
• Positron B
• Anion C
• None of above D

• -76 KJ A
• -57 KJ B
• -171 KJ C
• -114 KJ D

When potassium metal is exposed to violet light

• Ejection of electrons takes place A
• Ejection of some potassium atoms occurs B
• There is no effect C
• The absorption of electrons takes place D

An ionic compound M₂S₃is formed by the metal M,, the metal is

• Ca A
• Ba B
• K C
• Al D

The saturated hydrocarbons usually end with suffix ______

• Ane A
• Ene B
• Yne C
• Oic D

Noble gases have the electronic configuration with their valance shell ns²np⁶except one

• He A
• Ne B
• Kr C
• Xe D

The ionization potential is lowest for the

• Halogens A
• Inert gases B
• Alkaline earth metals C
• Alkali metals D

The majority of reactions which give stable products are:

• Exothermic. A
• Isothermal. B
• Endothermic. C
• Both (b) and (c). D

The reaction of an alkyl halide with RCOOAg produces

• Ester A
• Ether B
• Aldehyde C
• Ketone D

• Condensation A
• Electrophilic substitution B
• Free radical substitution C
• Nucleophilic substitution D

• Equal volumes of N₂and H₂are reacting A
• Equal masses of N₂and H₂are reacting B
• The reaction has stopped C
• The same amount of ammonia is formed as is decomposed into N₂and H₂ D

Which one of the following reaction takes place spontaneously

• 
  A
• 
  B
• 
  C
• 
  D

Colligative properties are the properties of :

• Dilute solutions which behave as nearly ideal solutions. A
• Concentrated solutions which behave as nearly non-ideal solutions. B
• Both(i) and (ii) C
• Neither (i) nor (ii) D

Which of the following undergoes uncleophilic substitution exclusively by S_N1 mechanism?

• Benzyl chloride A
• Ethyl chloride B
• Chlorobenzene C
• Isopropyl choride D

Carbon monoxide, emitted by automobiles, prevents transport of oxygen in body due

• Combining with oxygen to form carbon dioxide A
• Destruction of hemoglobin B
• Preventing reaction between oxygen and hemoglobin C
• Forming stable compound with hemoglobin D

The mass of one mole of proton is

• 1.008 g A
• 0.184 g B
• 1.673 g C
• 1.008 mg D

Aluminium oxide is:

• Acidic oxide A
• Basic oxide B
• Amphoteric oxided C
• None of these D

Which of the following sulphates is not soluble in water

• Sodium sulphate A
• Potassium sulphate B
• Zinc sulphate C
• Barium sulphate 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

The detection of functional group is called :

• Numerical analysis. A
• Qualitative analysis. B
• Combustion analysis. C
• Quantitative analysis. D

A fibre which is made from acrylonitrile as monomer

• PVC A
• Rayon fibre B
• Acrylic fibre C
• Polyester fibre D