ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Reaction between Zn and CuSO₄can be called a system under

• Surrounding A
• Observation B
• system C
• None of above D

Without proper suction filtration is

• Rapid process. A
• Fague process. B
• Slow process. C
• Useless process. D

The oxidation number of H is -1 in the compound

• H₂O A
• H₃BO₃ B
• NaOH C
• NaH D

Carboxyl group has functional group in it:

• One A
• Two B
• Three C
• Four D

A solution of NaOH has pH = 13, then concentration of NaOH is

• 10^-13M A
• 10¹³M B
• 10^-1M C
• 10⁺¹M D

General formula of carbocyclic acids is:

• RCOH A
• RCOR B
• RCOOR C
• R-OH D

A solution consisting of 92 grams ethyl alcohol (C₂H₅OH) 96 grams methyl alcohol (CH₃OH) 90 grams water the mole fraction and mole percent of methyl alcohol is

• 0.3. 30% A
• 0.2, 30% B
• 0.5, 30% C
• 0.2, 20% D

96500 C of electricity liberates from CuSO₄solution

• 63.5 g of Cu A
• 31.75 g of Cu B
• 96500 g of Cu C
• 100 g of Cu D

Which of the following reaction is characteristic of benzene

• Electrophilic substitution reaction A
• Reduction B
• Oxidation C
• Ozonolysis D

Which of the following synthetic phosphorous fertilizers is marked as super phosphate

• Calcium dihydrogen phosphate A
• Appetite B
• Calcium phosphate C
• Wavellite D

• The ionization energy of A is high and electron affinity of B is low A
• The ionization energy of A is low and electron affinity of B is high B
• Both the ionization energy of A and electron off affinity of B are high C
• Both the ionization energy of A and electron affinity of B are low D

Sulphuric acid reacts with PCl₅to give

• Thionyl chloride A
• Sulphur monochloride B
• Sulphuryl chloride C
• Sulphur tetrachloride D

In OF₂, number of bond pairs and Ione paris of electrons are respectively

• 2,6 A
• 2,8 B
• 2,10 C
• 2,9 D

Which of the following species is paramagnetic?

• CO₂ A
• NO B
• O^2- C
• CN D

The substance having highest conductivity at room temperature among the following is

• 0.1 N HCl A
• 0.1 N NaCl
  B
• Graphite C
• Glass D

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

• Caronium ion A
• Carbanion B
• Oconium ion C
• Carba ion D

Which one of the following is not a buffer

• H₂CO₃+ NaHCO₃solution A
• H₃PO₄+ NaH₂PO₄solution B
• Hl + Nal solution C
• NH₄OH + NH₄CI solution D

The acid present in vinegar is

• CH₃COOH A
• HCI B
• H₂SO₄ C
• HCOOH D

The rotation of two carbon atoms joined by double bond would happened only if

• Pi bond is broken A
• Sigma bond is broken B
• Both bonds are broken C
• None of above D

The function of salt bridge in the galvanic or voltaic cell is to

• Carry out oxidation at anode A
• To carry out reduction at cathode B
• Carry out electrolysis C
• To prevent the net charge accumulation in either of the half cells D

What are non-metals?

• Sb & Bi A
• P & Bi B
• N & P C
• As & N D

Which is an inert gas?

• Nitrogen A
• Oxygen B
• Hydrogen C
• CO D

The density of water decreases, when it is freezed at 0^oC because of

• Change of bond lengths A
• Change of bond angles B
• Cubic structure of ice C
• Empty spaces present in the structure of Ice D

Pakistan in the beginning was a country

• industrial A
• chemical B
• agrarian C
• technological D

Debye forces are present in one of the following pairs

• Na⁺ion and water A
• Argon and water B
• Argon and Na⁺ion C
• Ne and Water D

• Electrophilic substitution A
• Free radical reduction B
• Isomerisation C
• Nucleophilic substitution 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

Sodium belongs to block of periodic table:

• S-Block A
• p- block B
• d- block C
• f- bloci D

In which of the following reactions is the inorganic reagent acting as a nucleophile

• 
  A
• 
  B
• 
  C
• 
  D

All alkali metals react with acetylene to form acetylides except

• Li A
• Na B
• K C
• Rb D