ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following discoveries resulted in a version of the Mendeleefs

periodic law

• The nucleus of atom by Rutherford A
• The elements polonium and radium by the Curies B
• Atomic numbers by Moseley C
• x-rays by Roentgen D

Which of the following has more unpaired d-electrons?

• Zn⁺ A
• Fe²⁺ B
• Ni³⁺ C
• Cu⁺ D

Which of the following statements is correct?

• Phenol is less acidic than ethyl alcohol A
• Phenol is more acidic than ethanol B
• Phenol is more acidic than carbonic acid C
• Phenol is more acidic than CH₃COOH D

• Ethanol in the presence of concentrated sulphuric acid A
• Potassium hydroxide B
• Sodium C
• Sodium carbonate D

Energy of electron in the infinite Bohr orbit of H-atom is

• 0 KJ/mole A
• 1 KJ/mole B
• -1 KJ/mole C
• -1313.32 KJ/mole D

Alkali metals have electrons in s-orbital:

• one A
• two B
• three C
• Four D

Which has garlic like odour?

• N₂O A
• NO B
• NO₂ C
• NH₄ D

Reaction of Grignard's reagent with formaldehyde gives:

• pri-alcohol A
• sec-alcohol B
• ter-alcohol C
• carboxylic D

A colloidal gel is:

• 3Ca, Al₂O₃ A
• CaSO_2.2H₂O B
• 3CaAl₂O₃.3CaSO₄.2H₂O C
• 3Ca.Al₂O₃.6H₂O D

All the following decompose easily on heating to give oxygen except

• Lead nitrate A
• Potassium chlorate B
• Mercuric oxide C
• Manganese dioxide D

Acetic acid is manufactured by:

• Distillation A
• Fermentation B
• Ozonolysis C
• Esterification D

Which of the following statements is most appropriate about effective nuclear charge? It depends upon

• The shielding constant A
• The atomic number B
• The charge on the nucleus C
• Both the nuclear charge and the shielding constant D

95% ethanol is called :

• Rectified ether. A
• Diesel. B
• Rectified spirit. C
• Petrol. D

Cannizzaro reaction is not given by

• Trimethyl acetaldehyde A
• Acetaldehyde B
• Benzaldehyde C
• Formaldehyde D

An electrochemical cell is based upon

• Acid-base reaction A
• Redox reaction B
• Nuclear reaction C
• None of the above D

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy

• 10,000 A
• 20,000 B
• 100,000 C
• 50,000 D

• Hear of reaction A
• Heat of formation B
• Heat of neutralization C
• Heat of combustion D

Who gave the concept of atomic number

• Newton A
• Mosley B
• Dalton C
• Newland D

Oxidation state of boron, aluminium and gallium is:

• +1 A
• +2 B
• +3 C
• +5 D

Reaction of Grignard's reagent eith aldehyds other formaldehyde gives: Reaction of Grignard's reagent with formaldehyde gives:

• Pri-alcohol A
• Sec-alcohol B
• Ter-alcohol C
• Carboxylic D

Which one of the following is weakest inter molecular force?

• Dipole induced dipole forces A
• Ionic dipole forces B
• Electrostatic forces b/w ions C
• Dipole dipole forces D

The carbon, carbon bond length in benzene is

• 1.54A° A
• 1.34A° B
• 1.20A° C
• 1.39A° D

Compounds of carbon and hydrogen in which the tetra valency of carbon is fully satisfied are called,

• Saturated A
• Un-saturated B
• Magnetic C
• Para-magnetic D

For a given process, the heat changes at constant volume ( q_v)are related to other as:

• q_p= q_v

  A

• q_p<q_v

  B

• q_p>q_v

  C

• q_p=q_v/2

  D

The compound which gives oxygen on moderate heating is

• Zinc oxide A
• Mercuric oxide B
• Aluminium oxide C
• Ferric oxide D

Angle 120° is observed in molecules :

• CH₄ A
• CH_3-CH₃ B
• CH -CH C
• CH_{2 =}CH₂ D

Which of the following form normal oxide

• K A
• Li B
• Na C
• None D

Ecology is a science of environment and deals specially with

• Stratosphere A
• Biosphere B
• Lithosphere C
• Hydrosphere D

Hydrogen bond is the strongest between the molecules of:

• HF A
• HCl B
• HBr C
• Hl D

A one thousand dm³sample of water contains one gram of iron (iii) ions what is the concentration in parts per million of Fe^3f(eq) in parts per million

• 0.001 A
• 0.01 B
• 0.1 C
• 1.0 D