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CBSE Class 12-science Answered

mention the conditions required to maximise the yield of ammonia  (group 15)
Asked by niharikapabba2605 | 16 Jul, 2018, 09:56: PM
answered-by-expert Expert Answer
On a large scale, ammonia is manufactured by Haber’s process.              The optimum conditions for the production of ammonia are a pressure of 200 × 105 Pa (about 200 atm), a temperature of ~ 700 K and the use of a catalyst such as iron oxide with small amounts of K2O and Al2O3 to increase the rate of attainment of equilibrium.
Answered by Ramandeep | 17 Jul, 2018, 11:17: AM

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CBSE 12-science - Chemistry
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CBSE 12-science - Chemistry
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CBSE 12-science - Chemistry
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CBSE 12-science - Chemistry
why nitrogen have long range of oxidation state?
Asked by adarshkamble130 | 19 Aug, 2019, 12:22: AM
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CBSE 12-science - Chemistry
We know that nitrogen can't have +5 oxidation state,so why N2O5 exists?
Asked by ranvirsingh1as | 16 Dec, 2018, 10:50: PM
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CBSE 12-science - Chemistry
Why NO does not dimerise even it has odd electron?
Asked by ranvirsingh1as | 16 Dec, 2018, 10:47: PM
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CBSE 12-science - Chemistry
Explain the structures of BCl3 and PH3 with the help of theory of hybridisation.
Asked by Sneha | 16 Dec, 2018, 03:14: PM
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CBSE 12-science - Chemistry
A gas X is formed by heating ammonium nitrite. X can also be obtained by heating barium azide. Mg metal burns in X to form Y. Y reacts with water to form a gas zZwhich turns red litmus blue. Identify X,Y and Z. Write all the reactions involved.
Asked by lekhakarthikeyan | 28 Aug, 2018, 03:54: AM
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CBSE 12-science - Chemistry
A gas is obtained by the reaction of magnesium nitride with water. It acts as a lewis base and turns red litmus blue. It reacts with CuO as a reducing agent. It is obtained from two elements by reacting at 700K and high pressure. It is highly soluble in water. It forms blue coloured solution with copper sulphate. Identify the gas and write all the reactions involved.
Asked by lekhakarthikeyan | 28 Aug, 2018, 03:52: AM
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CBSE 12-science - Chemistry
GROUP 15 ELEMENT QUES .  1) An unknown salt X react with hot conc. straight H subscript 2 SO subscript 4 to produce a brown coloured gass which intensifies on addition on copper turnings . on adding dilute ferrous sulphate olution to an aqueous solution to an aquaeous solution of X and then carefully adding conc. straight H subscript 2 SO subscript 4 along the sides of testtube , a brown complex Y i formed at the interface between the solution and straight H subscript 2 SO subscript 4 . identify X and Y and write the reactions involved .  2) A transuclent waxy solid A on heating it on inert atmosphere is converted into its allotropic form B . Allotrope A on reaction with very dilute aqueous NaOH LIBERATES a highly poisonous gas C having rotten fih mell . The ubstance A reacts with excess of chlorine to form D which hydrolysis to form compound E .Identify A to E . Also write the reaction involved   Thankyou
Asked by niharikapabba2605 | 07 Aug, 2018, 01:00: AM
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