ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Turnbull's blue is a compound called?

• Ferricyanide A
• Ferrous ferricyanide B
• Ferrous cyanide C
• Ferri - Ferro cyanide D

Which structure shows a primary alcohol

• 
  A
• 
  B
• 
  C
• 
  D

The functional group isomer of dimethylether is

• Ethyl alcohol A
• Propyl alcohol B
• Diethyl ether C
• Butyl alcohol D

The most reactive elements are:

• Group IV-A A
• Group V-A B
• Group VI-A C
• Group VII -A D

Silver mirror test is applied for

• Aldehydes A
• Alcohols B
• Acids C
• Esters D

Glacial acetic acid freezes to ice like solid at (°C)

• 07 A
• 17 B
• 27 C
• 37 D

When electric current is used to carry out non-spontaneous redox, the process is called

• Hydrolysis A
• Electrolysis B
• Decomposition C
• Neutralization D

When no work is done by the system

• The volume of system decreases A
• The volume of system increases B
• The volume of system does not change C
• None of above D

Purine derivative among the following bases is

• Thymine A
• Uracil B
• Guanine C
• Cytosine D

Group l-A elements react with water fastly than the reaction of group ll-A elements because

• l_Aelements are more soft then ll_A A
• l_Aelements are non-metals B
• l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive C
• l_Aelements make ionic bond D

In a group, the ionization energy

• Increase A
• Decreases B
• Remain constant C
• First increases then decreases D

A single benzene ring can have ______ ortho position maximally

• One A
• Two B
• Three C
• Four D

Active metals react with carboxylic acid releasing gas:

• CO A
• CO₂ B
• H₂O as steam C
• H₂ D

What is the total number of different chloroethanes, formula C₂H_6-nCl_n, where n can be any integer from 1 to 4

• 4 A
• 6 B
• 7 C
• 8 D

During the mechanism of aldol condensation a/an ______ is formed

• Oxide A
• Alkali B
• Alkoxide ion C
• None of these D

H₂ + L₂ ----2Hl

In the above equilibrium system, if the concentration of reactants at 25°C is increased, the value K_C will :

• Remains Constant A
• Increases B
• Cecreases C
• Depends upon nature of reactans D

Which of the following nitrogen fertilizer contains more nitrogen

• NaNO₃ A
• KNO₃ B
• NH₄NO₃ C
• Urea D

The next homologue of C₁₀H₂₂will be

• C₉H₂₀ A
• C₁₂H₂₆ B
• C₁₁H₂₄ C
• C₁₃H₂₈ D

A solution containing maximum amount of solute dissolved at a given temperature is called

• Saturated solution A
• Unsaturated solution B
• Supersaturated solution C
• Impure solution D

Hydrolysis of ethyl-acetate (ester) has order of reaction :

• 3 A
• 2 B
• 1 C
• 1 D

Electronegativity values of the elements F, CI and Br vary

• F > CI > Br A
• Br > CI > F B
• Cl > Br > F C
• CI > F > Br D

Which compound is called a universal solvent?

• H₂O A
• CH₃OH B
• C₂H₅OH C
• CH₃----O---CH₃ D

Ionization energy of sodium is (Kj/mol)

• 503 A
• 523 B
• 513 C
• 524 D

Carboxylic acid can generally be prepared by various methods. Which of the following methods is not suitable for making carboxylic acids

• By the oxidation of primary alcohols A
• By the hydrolysis of nitriles B
• By the carbonation of Grignard, reagent C
• By the hydrolysis of p-amines D

Weakest acid among the followings is

• Acetic acid A
• Phenol B
• Water C
• Acetylene D

When fused PbBr₂is electrolyed then

• Bromine appears at cathode A
• Lead deposited at the cathode B
• Lead appears at the anode C
• None of these happens D

Reaction of HNO, with very dilute Zinc and at low temperature gives

• H₂ A
• NO B
• NO₂ C
• NH₄ D

Bleaching powder may be produced by passing chlorine over

• Calcium carbonate A
• Hydrated calcium sulphate B
• Anhydrous calcium sulphate C
• Calcium hydroxide D

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

Which carbon is more electronegative?

• sp³- hybridized carbon A
• sp-hybridized carbon B
• sp²-hybridized carbon C
• always same irrespective of its hybrid state D