ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The empirical formula of benzene is determined by

• IR spectra A
• U.V B
• Elemental analysis C
• NMR spectra D

Among group V-A elements, the most electronegative element is

• Sb A
• N B
• P C
• As D

London dispersion forces are alos called:

• Hydrogen bonding. A
• Debye forces B
• Van der Waal's forces C
• Instantaneous dipole-induced dipole forces. D

Alkyl halides react with lithium dialkyl copper reagents to give

• Alkenes A
• Alkyl copper halides B
• Alkanes C
• Alkenyl halides D

The steroids of fungi and yeast are called:

• Vitamin D A
• Vitamin D₂ B
• Ergosterol C
• Cholestorl D

A gas bulb is filled with NO₂gas and immersed in an ice bath at 0°C which becomes colourless after sometimes. This colourless gas will be

• NO₂ A
• N₂O B
• N₂O₄ C
• N₂O₅ D

The range of UV-B is:

• 320 to 400 nm A
• 200 to 280 nm B
• 280 to 320 nm C
• 50 to 400 nm D

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

• low ionization energy of sodium A
• sublimation of metallic sodium to give yellow vapour B
• emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region C
• photosenitivity D

Alcohols of low molecular weight are

• Soluble in water A
• Soluble in water on heating B
• Insoluble in water C
• Insoluble in all solvents D

The substance having highest conductivity at room temperature among the following is

• 0.1 N HCl A
• 0.1 N NaCl
  B
• Graphite C
• Glass D

The energy units in which heat changes usually expressed in SI-system are

• Joule A
• Calorie B
• Kilo Joule C
• Both a and c D

• Small change in concentration of product A
• Small time internal B
• Co-efficient of the reactant C
• Co-efficient of the product D

A beaker contains 9 grams of water. The number of H atoms is

• 6.02 x 10²³ A
• 3.01 x 10²³ B
• 6.02 x 10²⁴ C
• 3.01 x 10²⁴ D

During the formation of a chemical bond the potential energy of the system

• Decreases A
• Increases B
• Does not change C
• None of these D

(CH₂O)_nis general formula for

• Monosaccharides A
• Oiligosaccharides B
• Polysaccharides C
• None of these D

Which of the following is not the reactions of lithium

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following compound is known as oil of winter green?

• Phenyl benzoate A
• Phenyl salicylate B
• Phenyl acetate C
• Methyl salicylate D

When ethylene glycol is heated with acidified potassium permanganate, the main organic compound obtained is

• Oxalic acid A
• Glyoxal B
• Formic acid C
• Ethanol D

In a primary alkyl halide, the halogen atom is attached to a carbon which is further attached to

• Only one carbon atom A
• Two carbon atoms B
• Three carbon atoms C
• one or no carbon atom D

Drained sewage has B.O.D

• More than that of water A
• Less than that of water B
• Equal to that of water C
• None of the above D

The colour of a transition metal complex is due to d-d transition The colour of the complex is the complementary of the colour absorbed. Thus [Ti(H₂O₆]³⁺abosrbs yellow light and transmits blue and red colours therefore the solution of titanium complex appears

• Blue A
• Red B
• Yellow C
• Mixture of blue and red or violet D

Vital force theory was rejected by

• Berzellius A
• Kolbe B
• Wholer C
• Lavoiser D

Any property which depends upon the T.P and V is said to be

• Property due to k.E. A
• Property due to PE B
• Both a and b C
• Thermodynamic state D

Which is a component of macronutrient?

• Zn A
• N B
• Mo C
• Cl D

The quantum number which describe the orientation of the orbitals is

• Spin quantum number A
• Principle quantum number B
• Azimathal quantum number C
• Magnetic quantum number D

Inn which of these processes are small organic molecules made into macromolecules?

• The cracking of petroleum fractions A
• The fractional distilation of crude oil B
• the polymerization of ethane C
• The hydrolysis of proteins D

• Cu A
• H B
• N C
• O D

Methanol and ethanol can be distinguished by

• Iodoform test A
• Iucas test B
• Dichromate/H₂SO₄oxidation test C
• Flame test D

General formula of carbocyclic acids is:

• RCOH A
• RCOR B
• RCOOR C
• R-OH D

Introduction of a second methyl group in methylbenzene will give how many isomeric dimethyllenzenes

• 2 A
• 1 B
• 3 C
• 4 D