ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following will have the highest boiling point

• Methanol A
• Ethanol B
• Propanal C
• 2-hexanone D

The spectrum of helium is expected to be similar to that of

• H A
• Li⁺ B
• Na C
• He⁺ D

Ionization energies increase from left to right along the period due to

• Increase in nuclear charge A
• Repulsion of electron increases B
• Repulsion of protons increase C
• Atomic size increase along the period D

Selection of filter paper depends upon sizes of particles to be:

• Tested A
• ^Filtered B
• Checked C
• All of above D

Rates of organic reactions are

• Fast A
• Very fast B
• Slow C
• Non-reactive D

The shape of methanol, ammonia and water molecule can be explained by assuming

• Sp³ hybridization A
• Sp²hybridization B
• Sp hybridization C
• All of these D

Bohr model of atom is contradicted by:

• Planck's quantum theory A
• Pauli's exclusion theory B
• Heisenberg's uncertainty principle. C
• All of above. D

When hydrogen cyanide is added to an Aldehyde in the presence of ammonia it is called

• Strecker synthesis A
• Cory house synthesis B
• Williamson;s synthesis C
• None of these D

Which statement in not correct about alcohol?

• Ethyl alcohol is heavier than water A
• Ethyl alcohol ecaporates more quickly B
• Alcohol with less number of carbon atoms is more soluble in water than alcohol with more number of carbons atoms C
• Alcohol produces H₂by reaction with sodium metal D

The correct order of 2nd l.P. of C,N,O and F is

• O > F > N > C A
• O > N > F > C B
• C > N > O > F C
• F > O > N > C D

ph of the buffer CH₃COOh + CH₃COONa is 3.76. If the mixture contains 1 molar acetic acid and 0.1 molar sodium acetate, then pKa of this buffer is

• 3.76 A
• 4.76 B
• 5.76 C
• 6.76 D

Ethanol can be converted into ethanoic acid by

• Hydrogenation A
• Hydration B
• Oxidation C
• Fermentation D

Common names of carboxylic acids are given by then:

• Source A
• Person discovered B
• place C
• habit D

Select from the following the one which alcohol

• 
  A
• 
  B
• 
  C
• 
  D

The diameter of atoms is of the order:

• 2* 10^-5m A

• 2* 10^-10 m

  B
• 2* 10^-2m C
• 2* 10^-3m D

Which of the following is the simplest form of matter?

• Gaseous state A
• Liquid state B
• Solid state C
• All of above D

One mole of C₂H₅OH contains the number of H-atoms

• 6.02 x 10²³ A
• 3.61 x 10²⁴ B
• 1.81 x 10²⁴ C
• 6.02 x 10²⁴ D

Precipitation will occur until the ionic product becomes

• Equal to K_sp A
• Lesser than K_sp B
• Greater than K_sp C
• None of these D

In KO₂the oxidation state of oxygen is

• -2 A
• -1 B
• +1/2 C
• -1/2 D

The percentage of nitrogen in ammonia is

• 80% A
• 82% B
• 90% C
• 50% D

When phenol is distilled with zinc dust. It is reduced to

• Benzene A
• Benzaldehyde B
• Toluene C
• Hexanol D

The structure of benzene is

• Hexagonal A
• Pyramidal B
• Square planer C
• Tetrahedral D

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

• 3 A
• 2 B
• 1 C
• 0 D

Which one of the following elements is not present in all proteins?

• Carbon A
• Hydrogen B
• Nitrogen C
• Sulphur D

The value of SHE is cathode and anode is always taken to be

• One A
• Zero B
• Different C
• Same D

Chlorophyll contains in it

• Li A
• Na B
• Mg C
• Ca D

• Homogeneous A
• Heterogeneous B
• Isogeneous C
• None D

Coligative properties are the properties of

• Dilute solution which behave as nearly ideal solutions A
• Concentrated solutions which behave as nearly non-ideal solution B
• Both (i) and (ii) C
• Neither (i) and (ii) D

Two moles of acetic acid are heated with P₂O₅the product formed is

• 2 moles of ethyl alcohol A
• Formic anhydride B
• Acetic anhydride C
• 2 moles of methyl cyanide D

Which of the following ions has more electrons than protons and more protons than neutrons.

• D- A
• D2O+ B
• He+ C
• OH- D