Chromatography is a versatile separation technique widely used to obtain pure compounds from mixtures. All chromatographic techniques depend on a stationary phase, usually a finely divided solid or coated solid, that a mobile phase, usually a gas or liquid, moves through.

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Chromatography is a physical method of separation that distributes components to separate between two phases, one stationary (stationary phase), the other (the mobile phase) moving in a definite direction. The eluate is the mobile phase leaving the column.

Rumination is the process by which the cow regurgitates previously consumed feed and masticates it a second time. The ruminant stomach has four compartments: rumen, reticulum, omasum, and abomasum.

Therefore the formula of the compound is A₂B₃.

{tex}S+O_2 \to SO_2 \xrightarrow{Cl/H_2O} H_2SO_4 \xrightarrow{BaCl_2} BaSO_4{/tex}

From the above reaction

1mole of S produces 1 mole of BaSO₄ Number of moles in 8g of S = 8/32 = 0.25 Thus number of moles of BaSO₄ = 0.25

B. 79.2% 

{tex}C + 2S \to CS_2{/tex}

Ideally, 1 mole of C will react with 2 moles of S to form CS₂ 

1 mol of C = 12g 1 mol of S = 32g

12g carbon reacts with = 64g of Sulphur 1g carbon reacts with = {tex}64\over 12{/tex}g of Sulphur

4g carbon reacts with = {tex}{64\over 12}\times 4 = {64\over 3}{/tex}g of Sulphur

But we have only 8g of sulphur

It mean sulphur is limiting agent.

due to sulphur is limiting reagent reaction will proceed according to sulphur .

64g sulphur formed = 76g CS₂

1g S formed=  {tex}76\over 64{/tex} g CS₂

8g S formed = {tex}{76\over 64 }\times 8 = 9.5{/tex}g CS₂

Hence, % purity {tex}= {Wt. \ of \ product \over Wt. \ of \ reactants } \times 100{/tex} = {tex} {9.5 \over (4+8)}\times 100 ={ 9.5\over 12}\times 100 {/tex}

= 79.16 % = 79.2 %

The Green Revolution was a period when the productivity of global agriculture increased drastically as a result of new advances. During this time period, new chemical fertilizers and synthetic herbicides and pesticides were created. The chemical fertilizers made it possible to supply crops with extra nutrients and, therefore, increase yield.

The term "blue revolution" refers to the remarkable emergence of aquaculture as an important and highly productive agricultural activity. Aquaculture refers to all forms of active culturing of aquatic animals and plants, occurring in marine,or fresh waters.

Carbon monoxide (CO) is only a very weak directgreenhouse gas, but has important indirect effects on global warming. Carbon monoxide reacts with hydroxyl (OH) radicals in the atmosphere, reducing their abundance. So, carbon monoxide is not a green house gas.
 

Ans.

• Epimers are monosaccharides that differ in chirality at only one carbon.
• Anomers are special epimers; in cyclic forms of one single monosaccharide.