Nanomaterials ,Lubricants and Green chem & Refractory quiz

Which of the following is not one of the twelve principles of green chemistry?

• a) Using high temperatures to speed up reactions

• b) Minimising toxic reagents used in a synthesis

• c) Maximisation of atom economy

• d) Minimising the use of solvents

Green chemistry is regarded as a reduction process. Which of the following aspects are the targets of reduction?

(1) Cost of production

(2) Use of catalyst

(3) Risk and hazard

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Consider the production of 2-chloro-2-methylpropane in the following reaction:

(CH₃)₃COH + HCl --> (CH₃)₃CCl + H₂O

What is the atom economy for the above reaction?

(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0, Cl = 35.5)

• 50.0%

• 67.0%

• 83.7%

• 95.0%

Which of the following types of reaction has the greatest value of atom economy?

• Substitution

• Addition

• Elimination

• Condensation

Which of the following substances is NOT a volatile organic compound?

• Benzene

• Trichloromethane

• Carbon dioxide

• Methanal

Which of the following are sources of biomass to replace natural gas as the feedstock of many industrial processes?

(1) Seaweed from large-scale farming

(2) Waste paper from schools and offices

(3) Methane gas from landfill sites

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following are the benefits of using catalysts in industrial processes?

(1) Obtaining a higher yield per reaction cycle

(2) Lowering the operating temperature

(3) Getting more product in a relatively shorter period of

time

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

An ideal lubricant should have high boiling point

• True

• False

An ideal lubricant should have high freezing point

• True

• False

The lubricants used at higher speed are of

• Higher Viscosity

• Lower Viscosity