ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following compounds could be prepared by reacting bromoethane with KCN and then reducing the product

• CH₃CH₃ A
• CH₃CH₂NH₂ B
• CH₃CH₂CH₂NH₂ C
• CH₃CH₂CH₃ D

A colloidal gel is

• 3cA, Al₂O₃ A
• CaSO₂.2H₂O B
• 3CaAl₂O₃.3CaSO₄.2H₂O C
• 3Ca.Al₂O₃.6H₂O D

A property which differs fluorine from the other halogens?

• Direct combination with inert gases A
• Uninegative B
• Diatomic C
• ns² , np⁵ D

E₁mechanism is generally shown by

• 1° - RX A
• 2° - RX B
• 3° - RX C
• None of these D

How many monochlorobutanes will be possible on chlorination of n-butane?

• 1 A
• 2 B
• 3 C
• 5 D

When aqueous solution of NaOH is electrolysed useing graphite electrodes, the product obtained at anode is

• O₂gas A
• H₂gas B
• Na metal C
• Na₂O D

Which compound is the most reactive one?

• benzene A
• ethene B
• ethane C
• ethyne D

Mendeleev was a scientist:

• Russioan A
• German B
• English C
• French D

• 0.12 A
• 0.50 B
• 0.25 C
• 4.00 D

SN₂ reaction has order of reaction :

• First A
• Second B
• Third C
• Zero D

Analytical chemistry is the science of :

• Chemical Characterization. A
• Physical Characterization. B
• Biological Characterization. C
• Biochemical Characterization. D

What is the shape of Fe(CO)₅molecule?

• Tetrahedral A
• Octahedral B
• Trigonal bipyramidal C
• Square pyramidal D

Which of the following pair contains isomers of each other

• Propanoic acid and propanone A
• Acetone and acetaldehyde B
• Ethyl alcohol and diethyl ether C
• Methyl alcohol and dimethyl ether D

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

• 5s A
• 5p B
• 5d C
• 5f D

Reactivity of alkyl halides with magnisium is of the order:

• Rl > RBr> RCl > RF A
• RBr > RCl >RF > Rl B
• RCL > RF > Rl > RBr C
• RF >RI >RBr > RII D

• 4 mole per dm³ A
• 2 mole per dm³ B
• 0.33 mole per dm³ C
• 0.67 mole per dm³ D

The weight of pure NaOH required to prepare 250 cm³of 0.1 N solution is

• 4 g A
• 1 g B
• 2 g C
• 5 g D

Which salt is used for the treatment of hyperacidity in stomach

• NaCl A
• KCl B
• NaHCO₃ C
• Na₂CO₃ D

The osmotic pressure of solution increases if

• Temperature is decreased A
• Solution constant is increased B
• Number of solute molecules are increased C
• Volume is increased D

Polymer formation from monomers starts by

• Condensation reaction between monomers A
• Coordination reaction between monomers B
• Conversion of monomer to monomer ions by protons C
• Hydrolysis of monomers D

Soil salinity can be measured by

• Calorimeter A
• Potometer B
• Porometer C
• Conducitvity meter D

Which is not true about acetophenone?

• Reacts to form 2,4-dintrophenyl hydrazine A
• Reacts with Tollen's reagent to form silver mirror B
• Reacts with I₂/NaOH to form iodoform C
• On oxidation with alkaline KMnO₄followed by hydrolysis gives benzoic acid D

The correct relation b/wK_{c and}K_{p is :}

• K_p = K_c[P/N] ^Δn

  A

• K_{c =} K_p(RT) ^Δn

  B

• K_{p =} K_c(RT) ^Δn

  C

• K_{p =} K_c(RT) ^Δn

  D

The boiling point of glycerol is more than propanal because of

• Hybridisation A
• H-bonding B
• Resonance C
• All these factors D

Teflon, styron and neoprene are all

• Copolymers A
• Condensation polymers B
• Homopolymers C
• Monomers D

3 moles of ethanol react with one mole of phosphorus tribromide to from 3 moles of bromoethane and on mole of X. Which of the following is X?

• H₃PO₄ A
• H₃PO₂ B
• HPO₃ C
• H₃PO₃ D

Raney - nickel is the alloy of Ni with

• Pt A
• Al B
• Cu C
• Pd D

The comparative rates at which the solutes move in paper chromatography, depend on:

• the size of per sued. A
• R_f values of solutes B
• temperature of the experiment C
• size of the chromatography tank used. D

The clotting time of blood is increased due to the deficiency of

• Vitamin A A
• Vitamin K B
• Vitamin D C
• Vitamin C D

On hydrolysis of starch, we finally get

• Glucose A
• Fructose B
• Both C
• Sucrose D