ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Maximum potential energy that an electron can have within the atom is:

• Equal to zero. A
• Less than zero. B
• Greater than zero. C
• Infinite D

When carbon dioxide is passed through the R - Mg - X is produced

• Any carboxylic acid A
• Propanoic acid B
• Propanedioic acid C
• None of these D

Mustard gas is a

• Gas A
• High boiling speed B
• High melting liquid C
• Steam D

The percentage of carbon in different types of iron products is in the order of

• Cast iron > wrought iron > steel A
• Wrought iron > steel > cast iron B
• Cast iron > steel > wrought iron C
• Cast iron = steel > wrought iron D

With amino acids ninhydrin solution gives

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

Posphorus belongs to a group

• III-A A
• IV-A B
• V-A C
• VI-A D

Oxidation of methyl alcohol gives

• Formaldehyde A
• Acetone B
• Ester C
• Acid D

C₂H₅OH can be differentiated from CH₃OH by

• Reaction with HCl A
• Reaction with NH₃ B
• Iodoform test C
• Solubility in water D

Law of mass action was given by :

• Guldberg and Waage. A
• Berkeley and Hartly. B
• Ramsay and Reyleigh. C
• Berthelot. D

When the degree of freedom increase the entropy ______

• Decreases A
• Increases B
• Remains same C
• All D

On passing HCI gas through a saturated solution of commercial sodium chloride, pure crystals of NaCI are precipitated due to

• Increase in pH of the solution A
• Decrease in pH of the solution B
• Common ion effect C
• Increase in ionization of NaCl D

For a given process, the heat change at constant pressure (p) and constant volume (v) are related to each other as

• 
  A
• 
  B
• 
  C
• 
  D

In the chemical combination of hydrogen and fluorine to form HF:

• Sodium atom donates major share of its electrons. A
• Hydrogen atom donates the major share of its electrons. B
• Both the atoms share the electrons equally. C
• None of above. D

F₂, Cl₂, Br₂and l₂lie below SHE is the Electro chemical series that is why these

• Undergo reduction A
• Undergo oxidation B
• Liberate H₂gas with steam C
• None of these D

Alcohols are named by replacing 'e' of alkane with:

• al A
• ene B
• ol C
• one D

Which statement about gases is not correct ?

• The spread throughout the vessel. A
• Pressure is due to collision B
• There are large spaces between the molecules. C
• molecules are arranged regularly. D

Boiling point of acetic acid is ^oC

• 116 A
• 117 B
• 118 C
• 119 D

The unit of rate constant K ismole^-1 dm³for a chemical reaction, the order of reaction is :

• Order of reaction can determined by an experiment A
• Order of reaction can determined from a balance equation only. B
• Order of reaction can determined increases by increasing temperate. C
• Order of reaction must be in whole number and not in fraction. D

If pH of buffer of 1 mole dm^-3of HCOOH + 0.1 mole dm^-3HCOONa having pKa = 3.78 is

• 1.78 A
• 2.78 B
• 3.78 C
• 4.78 D

Which of the following species has the highest ionization potential?

• Ne A
• Al⁺ B
• Mg⁺ C
• Li⁺ D

The organic compounds containing Ph-OH group are called:

• Phenol A
• aldehyde B
• Keton C
• Carboxylic acids D

Formalin is:

• 10% solution of formaldehyde in water A
• 20% solution of formaldehyde in water B
• 40% solution of formaldehyde in water C
• 60% solution of formaldehyde in water D

When methane reacts with Cl₂in the presence of diffused light the products obtained are?

• Chloroform only A
• Carbon tetrachloride only B
• Chloromethane and dichloromethane C
• Mixture of a,b,c D

Lysine is ______ amino acid

• Acidic A
• Basic B
• Natural C
• None of these D

Factors affecting quality of water:

• D.O A
• BOD B
• COD C
• All of these D

When an electron is absorbed in an empty or partially filled orbital of an atom, the energy released is called

• Ionization energy A
• Potential energy B
• Electron affinity C
• Bond energy D

Chloroform and acetone are soluble in each other due to

• Instantaneous dipole interactions A
• Dipole-dipole interactions B
• Intermolecular hydrogen bonding C
• All of above D

• Low pressure A
• High pressure B
• High temperature C
• High concentration of SO₂ D

Which of the following compounds gives red precipitate with AgNO₃?

• Kl A
• K₂CrO₄ B
• NaBr C
• NaNO₃ D

Which substances haveΔH =ΔE

• Solids A
• Liquids B
• Gases C
• Liquids and solids D