ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Most transition elements show

• Diamagnetic behavior A
• Ferromagnetic behavior B
• Paramagnetic behavior C
• None of these D

In the expression rate = K [A]^a[B]^bK is

• The order of reaction A
• The speed of reaction B
• The specific rate constant C
• The overall order of reaction D

A balloon contains 0.02 gram of H₂gas, it contains H₂molecules

• 6.02 x 10²³ A
• 3.01 x 10²² B
• 6.02 x 10²¹ C
• 3.01 x 10²¹ D

Which of the following sets of atomic numbers belong to that of the alkali metals?

• 1,12,30,4,62 A
• 37,19,3,55 B
• 9,17,35,53 C
• 12,20,56,88 D

Acetic acid is also named.

• Methanoic acid A
• Ethanoic acid B
• Propanic acid C
• Butanoic acid D

In carboxyl group the bond between C and oxygen is:

• Sigma bond A
• Single bond B
• Double Bond C
• Triple bond D

• 
  A
• 
  B
• 
  C
• 
  D

The configuration 1s²2s²2p⁵3s¹shows

• Excited state of O₂ A
• Excited state of neon B
• Excited state of fluorine C
• Ground state of fluorine atom D

Chromium (VI) is highly toxic and can cause

• Blindness A
• Cancer B
• Liver problems C
• Blood problems D

Simple sugars are :

• Monosacchrides A
• Disaccharides B
• Oligo saccharides C
• Trisaccharides D

Major food factors are:

• Fats and oils A
• Carbohydrates B
• Protiens C
• All of these D

The number of moles of solute in 1000g (1 Kg) of the solvent is called :

• Molarity A
• Molarity B
• Normality C
• Mole fraction D

Activity of the enzyme is reduced by

• Temperature A
• Concentration B
• pH C
• Inhibitors D

CL₂, N₂ and O_{2 are:}

• Diatomic molecules

  A

• Hetero atomic molecules

  B

• Poly-atomic molecules

  C
• Mono-atomic molecules D

Which of the following species has unpaired electrons in ant-bonding molecular orbitals?

• O2⁺²

  A

• N2^-2

  B

• B₂

  C

• F₂

  D

The limiting line of Blamer series in hydrogen spectrum lies in

• Visible regions A
• Ultraviolet region B
• Infrared region C
• x-rays region D

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

Which of the following does give violet colour with neutral ferric chloride?

• Acetic acid A
• Salicaylic acid B
• Formine acid C
• Benzoic acid D

The rate of E₁reaction depends upon:

• The concentration of substrate A
• The concentration of nucleophile B
• The concentration of substrate as well as nucleophile C
• None of these D

The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm^-1cm^-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

• 0.142 cm^-1 A
• 0.66 cm^-1 B
• 0.916 cm^-1 C
• 1.12 cm^-1 D

pH of 0.1 molar HCl solution is

• 1 A
• zero B
• 13 C
• 14 D

Smell of halogen is

• Fruity A
• Sweet B
• Irritating C
• Rotten egg D

Quality of fuel is judged from its octane number. The best fuels are

• Straight chain hydrocarbons A
• Branched chain hydrocarbons B
• Cyclic compounds C
• Compounds containing benzene ring D

The structure of complex hydrides is

• Tetrahedal A
• Trigonal B
• Octahedral C
• Square planar D

A standard hydrogen electrode is used as standard electrode of which electrode potential is arbitrarily taken as

• +1 A
• -1 B
• 0.1 C
• Zero D

Which term was derived from atomos?

• atom A
• hydrocarbon B
• aromatic C
• aliphatic D

One mole of SO₂contains

• 6.02 x 10²³atoms of oxygen A
• 18.1 x 10²³, molecules of SO₂ B
• 6.02 x 10²³ atoms of sulphur C
• 4 gram atoms of SO₂ D

The amount of heat evolved or absorbed by keeping reactants and products at one atmospheric pressure at room temperature is called

• Heat of formation A
• Standard heat of formation B
• Standard enthaply change C
• None D

The mass of the neutron is of the order of

• 10^-23 kg A
• 10^-24kg B
• 10^-26kg C
• 10^-27kg D

Electron affinity of sulphur is

• More than O and Se A
• More than O but less than Se B
• Less than O but more than Se C
• Equal to O and Se D