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These two monomers have similar structures, but with a slight difference of sulphur atom replaced by a nitrogen atom bonded to hydrogen. Which pair represents these monomers?

These two monomers have similar structures, but with a slight difference of sulphur atom replaced by a nitrogen atom bonded to hydrogen. Which pair represents these monomers? Correct Answer Thiophene and Pyrrole

Thiophene and Pyrrole have similar structures. Thiophene has a molecular formula of (C4H4S) while the molecular formula for Pyrrole is (C4H4NH). These molecules have alternating double and single bonds in their structures and hence they form pi-conjugated polymers.

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Statement : Over 27,000 bonded labourers identified and freed are still awaiting rehabilitation.

Courses of Action :
I. More cases of bonded labourers should be identified.
II. Till the proper rehabilitation facilities are available, the bonded labourers should not be freed.
III. The impediments in the way of speedy and proper rehabilitation of bonded labourers should be removed.
In the question below, are given a statement followed by three courses of actions numbered I, II and III. On the basis of the information given, you have to assume everything in the statement to be true, and then decide which of the following suggested courses of actions logically follow(s) for pursuing. Statement: High-sulphur fuel oil (HSFO), essentially the leftovers of an oil refiner's output, will still flow from refineries around the world even after new rules start up in 2020 curtailing its use in the global shipping fleet.Sixty percent of the 33 refineries in a global survey will still produce HSFO in 2020 although the supply will tighten as 70 percent of these refiners plan to reduce their output.  Courses of action: I. Starting that year, ships will use marine fuel, which primarily consists of residual fuel oil, with a maximum sulphur content of 0.5 percent under International Maritime Organization (IMO) rules to reduce air pollution.  II. Currently, the global shipping fleet, which includes oil and chemical tankers as well as container ships, uses as much as 3.3 million barrels per day of HSFO with a maximum of 3.5 percent sulphur.  III. Refiners will have little incentive to produce HSFO after the regulations though some demand will remain as a small but growing number of vessels are fitted with smokestack scrubbers that remove the sulphur from the exhaust fumes and power plants will continue to consume the fuel. 
Consider the following statements regarding Hydrogen and Atom Bombs:  The energy released in a Hydrogen bomb is several magnitudes higher than an Atom bomb. A Hydrogen bomb derives its energy through the fission of atoms while an atom bomb derives its energy from fusion. Which of the statements given above is/are correct?
Which of the following statements are correct? 1. The pair (AB) is controllable implies that the pair (ATBT) is observable. 2. The pair (AB) is controllable implies that the pair (ATBT) is unobservable. 3. The pair (AC) is observable implies that the pair (ATCT) is controllable. 4. The pair (AC) is observable implies that the pair (ATCT) is uncontrollable. where: A, B and C are having their standard meanings
Which of the following is correct with regarding the formation of Nitrogen? I. Nitrogen is obtained by liquefaction and fractional distillation of air. II. Nitrogen is obtained by reacting an aqueous solution of Ammonium chloride with Sodium Nitrite. III. Decomposition of Sodium or Barium Azide at high-temperature results in the formation of pure Nitrogen. IV Nitrogen is not soluble in water.
Solution of nitrogen in liquid iron may be assumed to follow Sievert's law. Nitrogen content of liquid iron. at 1873K in equilibrium with 1 atm pressure of nitrogen is measured as 0.044 (mass %). What will be the equilibrium nitrogen content in liquid iron (mass%), if nitrogen pressure is reduced to 0.25 atm?
The fresh feed to an ammonia synthesis reactor contains nitrogen, hydrogen and 2.0 mole per cent inerts. The molar ratio of H2:N2 is 3:1. The product stream consists of pure ammonia. Since conversion in the reactor is only 15%, a recycle stream is used and in order to avoid build-up of inerts, a purge stream is withdrawn. The rate of purge stream is adjusted to keep inert concentration in the recycle stream at 8 mole per cent. For a fresh feed rate of 100 moles/hr. Note that recycle stream contains only nitrogen, hydrogen and inerts. The N2:H2 ratio of 1:3 is maintained in every process stream, and calculate the moles of nitrogen entering the reactor and in the recycle stream?
The fresh feed to an ammonia synthesis reactor contains nitrogen, hydrogen and 2.0 mole per cent inerts. The molar ratio of H2:N2 is 3:1. The product stream consists of pure ammonia. Since conversion in the reactor is only 15%, a recycle stream is used and in order to avoid build-up of inerts, a purge stream is withdrawn. The rate of purge stream is adjusted to keep inert concentration in the recycle stream at 8 mole per cent. For a fresh feed rate of 100 moles/hr. Note that recycle stream contains only nitrogen, hydrogen and inerts. The N2:H2 ratio of 1:3 is maintained in every process stream, and calculate the number of moles, moles of inerts and moles of hydrogen in the recycle stream?
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