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more stable metal gold silver platinum

Posted by Shubham Baghel (Jul 17, 2017 1:29 p.m.) (Question ID: 6708)

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A sample of 1.0g of solid Fe2Oof 80%purity is dissolved in a moderately concentrated HCl solution which is reduced by zinc dust. The resulting solution required 16.7 mL of a 0.1M solution  of the oxidant. Calculate the number of electrons taken up by the oxidant.

Posted by Bharti Earekar (Jul 17, 2017 11:53 a.m.) (Question ID: 6706)

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What is rumination simple way

 

Posted by Maan Wala (Jun 01, 2017 4:07 p.m.) (Question ID: 5617)

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  • 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.

    Answered by Payal Singh (Jun 01, 2017 4:13 p.m.)
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Two element A of atomic weight 75 and B of atomic weight 16 combine two yield a product the percentage by weight of A in the compound was found to be 75.08 the formula of compound is

Answer A2B3

Posted by Pulkit Bajpai (May 26, 2017 11:10 p.m.) (Question ID: 5513)

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  • Element Percentage by weight Atomic weight Relative no. of atoms Simple ratio
    A 75.8 75 75.8/75 = 1.01 2
    B 24.2 16 24.2/16= 1.51 3

     

    Therefore the formula of the compound is A2B3.

    Answered by Payal Singh (May 27, 2017 7:37 p.m.)
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8 gram of sulphur are burnt to form a SO2 which is oxidised by CL2  water the solution is treated with bacl2 solution the amount of baso4 precipitated is

Answer 0.25mol

Posted by Pulkit Bajpai (May 26, 2017 11:08 p.m.) (Question ID: 5512)

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  • {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 BaSO= 0.25

    Answered by Payal Singh (May 27, 2017 7:42 p.m.)
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2 moles of mixture of co and co2 requires exactly 56 gram KoH in the solution for complete conversion of all the co2 into K2co3. How much amount more of koh will be required for conversion into k2co3 if 2 moles of mixture is completely oxidized to co2?

A 28g

B 56g

C 168g

D 112g

Posted by Pulkit Bajpai (May 26, 2017 10:46 p.m.) (Question ID: 5510)

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The volume of chlorine at STP required to liberate all the bromine and Iodine present in 1 mole of KI and 2 moles of MBR2 is ?

A 22.4

B 56

C 44.8

D 33.6

 

Posted by Pulkit Bajpai (May 26, 2017 10:42 p.m.) (Question ID: 5509)

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4 gm of carbon is heated with 8 gm of sulphur .how much cs2 will be formed when the reaction is complete . What will be the % purity?

A 70.2%

B 79.2%

C 90%

D 90.2%

Posted by Pulkit Bajpai (May 26, 2017 10:38 p.m.) (Question ID: 5508)

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  • 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 %

    Answered by Payal Singh (May 27, 2017 9:44 p.m.)
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Consider the ground state of Cr atom the number of electrons with the azimuthal quatum numbers l=1 and 2 are respectively? .........provide best concept material for atomic structure! !! 

Posted by Doreamon Superman (Mar 28, 2017 9:22 a.m.) (Question ID: 4560)

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1) what is meant by green revolution and blue revolution? 

2) Co (or )co2 which one of them is not a green house gas ?

Posted by Doreamon Superman (Mar 27, 2017 3:48 p.m.) (Question ID: 4550)

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  • 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.
     

    Answered by Shweta Gulati (Mar 27, 2017 9:23 p.m.)
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Difference between epimers and annomers? 

Posted by Doreamon Superman (Mar 27, 2017 7:58 a.m.) (Question ID: 4542)

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  • Ans.

    • Epimers are monosaccharides that differ in chirality at only one carbon.
    • Anomers are special epimers; in cyclic forms of one single monosaccharide.
    Answered by Naveen Sharma (Mar 27, 2017 10:06 a.m.)
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