ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Phenol is a weak acid. The correct order of acid strength of carboxylic acid, phenol and alcohol is

• Carboxylic acid > phenol > alcohol A
• Carboxylic acid > alcohol > phenol B
• Phenol > carboxylic acid > alcohol C
• Alcohol > phenol > carboxylic acid D

The total number of possible values of magnetic quantum number for the value of l=3 is

• 3 A
• 1 B
• 5 C
• 7 D

According to the SI-system heat contents are measured in units of

• Calorie A
• Joules B
• Ergs C
• Watts D

The number of bonds in nitrogen molecule is

• Oneφ and one π

  A

• Oneφ and two π

  B
• three sigma only C

• Two φ and one π

  D

Which is not the condition for the formation of smog

• There must be sufficient NO gas A
• There must be sunlight to help photo chemical reaction to take place B
• Air must be blowing swiftly C
• There must be SO₂in the air D

Dilatometric method is used for rate determination when

• Reactions involving change of optical A
• Reactions involving change of optical activity B
• Reactions involving small volume change C
• None of above D

The nature of positive ray depend on:

• The nature of electrode. A
• The nature of discharge tube. B
• The nature of residual gas. C
• All of above. D

Atmosphere thickness is (in km) around the earth:

• 10 km A
• 100 km B
• 1000 km C
• 1500 km D

Hydration energy depends upon:

• Change of Ion A
• Size of Ion B
• Charge to size ratio C
• Heat changes D

• Step 1 Step 2
  HCI HCN
  A
• HcN,NaCH H₂SO₄ B
• H₂SO₄ K₂Cr₂O₇/H₂SO₄ C
• KCN HCI D

Grignard's reagent was prepared in:

• 1900 A
• 1910 B
• 1920 C
• 1930 D

Major fertilizers with micro-nutrients are:

• Nitrogeneous A
• Phosphalic B
• Potash C
• All of these 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

The ratio of the ionization energy of H and Be³⁺is

• 1 : 1 A
• 1 : 3 B
• 1 : 9 C
• 1 : 16 D

Which of the following is a colligative property?

• Melting point A
• Osmotic pressure B
• Freezing point C
• Sublimation temperature D

Which set of hybrid orbitals has planar triangle shape?

• sp³ A
• sp B
• sp² C
• dsp² D

Ethyl alcohol is industrially prepared from ethylene by

• permanganate oxidation A
• Catalytic reduction B
• Absorbing in H₂SO₄followed by hydrolysis C
• Fermentation D

The only forces are London dispersion forces among the

• Atoms of He in gaseous state at high temperature A
• Molecules of water in liquid state B
• Molecules of solid I₂ C
• Molecular of hydrochloric acid gas D

Which of these polymers is an addition polymer?

• Nylon-6,6 A
• Polystrene B
• Terylene C
• Epoxy resin D

Benzene reacts with chlorine to form benzene hexachloride in presence of

• Nickel A
• AlCl₃ B
• Bright sunlight C
• Zinc D

The oxide of beryllium is

• Acidic A
• Amphoteric B
• Superoxide C
• Basic D

Allotropic forms of oxygen Te, Se are

• Two A
• Three B
• Four C
• Five D

Binary compounds of hydrogens are called:

• Halides A
• Hydrides B
• Oxides C
• Nitrides D

How many mole of acidfied FeSO₄solution can be completely oxidized by one mole of KMNO₄?

• 10 A
• 5 B
• 6 C
• 2 D

A compound R has all of the following properties. It is neutral; It gives an orange precipitate with 2,4-dinitrophenythydrazine; it evolves hydrogen chloride when treated with PCI₅in the cold What could R be

• 
  A
• 
  B
• 
  C
• 
  D

The energy of the first electron is helium will be

• -13.6 eV A
• -54.4 eV B
• -5.44 eV C
• zero D

Formula of chloroform is:

• CH₃Cl A
• CCl₄ B
• CH₂Cl₂ C
• CHCl₃ D

Calcium carbonate contains oxygen in it

• 48% A
• 50% B
• 53% C
• 60% D

In the particular reaction for the valueK_{c 1 x}10^-25which statement is correct :

• Almost forward reaction is completed. A
• Amount of reactant is negligible as compared to product. B
• Amount of product is negligible as compared to reactant. C
• Amount of product is equal to amount of reactant. D

Which statement is incorrect about standard hydrogen electrode

• Its oxidation and reduction potential is zero A
• It consists of Pt wire dipped on 1 molar HCI solution B
• The electrolyte is 1 molar NaOH solution C
• H₂gas is passes in it at 1 atmospheric pressure D