ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Spraying of DDT produces pollution of

• Air A
• Air and water B
• Air and soil C
• Air, water and soil D

The active part in a molecule is called

• Hetroatom A
• Functional group B
• Chemical bond C
• Ion D

Which one of the following compounds does not have the empirical formula CH₂O?

• Ethanoic acid, CH₃CO₂H A
• Ethanol, CH₃CH₂OH B
• Glucose, C₆H₁₂O₆ C
• Methanal, HCHO D

Chlorobenzene on heating with aqueous NH₃under pressure in the presence of cuprous chloride gives

• Benzamide A
• Nitrobenzene B
• Aniline C
• Chloroaminobenzene D

Which is a component of micro nutrient?

• N A
• Zn B
• P C
• K D

The sum of the exponents of the conc. terms in the rate equation is called

• Rate of reaction A
• Order of reaction B
• Specific rate constant C
• Average rate D

Use of glycol as anti freeze in the automobile is an important application of

• Colligative property A
• Raoult's law B
• Fractional crystallization C
• Prrhenivs law D

• 1 A
• 2 B
• 3 C
• 4 D

To calculate volume of the solvent, we need to know, the :

• Density of solute A
• Normality of solute B
• Mass of solute C
• Molarity of solute D

Vant Hoff's factor of Ca(NO₃)₂is

• 1 A
• 2 B
• 3 C
• 4 D

Esters have peculiar smell, which of the following is used as an essence of orange

• Isoamyl acetate A
• Iosamyl valerate B
• Octyl acetate C
• Methyl butyrate D

Monocarboxylic acids exist as dimer because of

• Dipole-dipole attraction A
• Hydrogen bonding B
• Van der Waals forces C
• Conhesive forces D

By simply reacting Grignand's reagent with water we get

• An alkane A
• Higher alkane B
• An alkene C
• An alkyne D

Hydrocarbon molecule with large chain lengths experience:

• Weaker attractive forces A
• Stronger attractive forces B
• Repulsive forces C
• No attractive forces D

Which of the following compounds is explosive in nature?

• Phosphorus trichloride A
• Nitrogen trichloride B
• Hyponitrous acid C
• Nitrosyl chloride D

The amount of heat evolved or absorbed in a chemical reaction, when the molar quantities of products and reactants being the same as represented in chemical equation. is called

• Heat of reaction A
• Free energy of reaction B
• Entropy of reaction C
• None of these D

Ethyl bromide on treatment with alcoholic KOH gives

• Ethylene A
• Ethanol B
• Acetic Acid C
• Ethane D

The boiling points of alcohols are higher than the corresponding alkanes, This is because

• Of hydrogen bonding existing between molecules of alcohols A
• Alkanes are dipolar compounds B
• Alcohols are sweet in taste C
• Alcohols are soluble in water D

In a period, melting points of elements

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

Ethyl alcohol prepared during fermentation is pure:

• 20% A
• 10% B
• 11% C
• 12% D

When a carboxylic acid reacts with a metal ______ gas is evolved

• H₂ A
• CO₂ B
• CI₂ C
• None of these D

Benzene gives reactions generally

• electrophilic A
• addition substitution B
• synthesis C
• addition and electrophilic substitution D

The lanthanides contraction is responsible for the fact that

• Zr and Y have about the same radius A
• Zr and Nb have similar oxidsation state B
• Zr and Hf have about the same radius C
• Zr and Zn have the same oxidation satete D

Heat absorbed or released during the chemical reaction of physical process at constant pressure is equal to

• 
  A
• 
  B
• 
  C
• 
  D

Which woody raw material is used for the manufacture of paper pupl

• Cotton A
• Bagasse B
• Poplar C
• Rice straw 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

Which of the following liquids has low vapour pressure at 25⁰C

• Diethyl ether A
• Acetone B
• Water C
• Ethyl alochol D

The number of elements in the 4th periods of periodic table is

• 8 A
• 10 B
• 18 C
• 32 D

The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to

• 1.661 x 10^{-27- Kg} A
• 1.661 x 10^-24Kg B
• 1.661 x 10^{-27- g} C
• 1.661 x 10^-24mg D

Ionization is the process in which ionic compounds when fused or dissolved in water split up into charged particles called :

• Atoms. A
• Electrons. B
• Protons . C
• Ions D