In the first biological applicativon of bucky ball , chemists at the University of Califorminaat San `F` Francisoc and Santa Barbra made a discovery in ` 1993` that could help I designing drugs to rtreat `AIDS`. The human immunodeficienrcy virus (HIV) that causes AIES reproduces by syntheising a long protein chain , which is cut into smaller segments by an enzymecalled HiV-proteases . ONe way to stop `AIDS`, then might be to inacivate the enzyme. when the chemists reacted a water-soluble derivative of bucky ball with HIV-protease , they found that itbinds to the portion of th enzyme that would ordinarily clareve the repreouctive protein , preventing the ` HIV` virus from reproducing . Consequently the virus could no bnolgre infect the human cells they had frown in the laboratory . The buycky ball compound itself is not a suitable drug for use against AIDS because of potential side effects and delivery difficaultes , but it does provide a model for the development of such drugs Consider following statements about bucky ball : A , It is also called fullerene B: It is also called Buckministerfullerene C: Bucky tubes (made of fullerenes ) are several times stronger than stel whnires D: Bucky ball is a plastic polymer Select correct statement (s) :A. `A,C,D`B. `A,B,C`C. `A,B,D`D. `B,C,D`

In the first biological applicativon of bucky ball , chemists at the U

1.	In the first biological applicativon of bucky ball , chemists at the University of Califorminaat San `F` Francisoc and Santa Barbra made a discovery in ` 1993` that could help I designing drugs to rtreat `AIDS`. The human immunodeficienrcy virus (HIV) that causes AIES reproduces by syntheising a long protein chain , which is cut into smaller segments by an enzymecalled HiV-proteases . ONe way to stop `AIDS`, then might be to inacivate the enzyme. when the chemists reacted a water-soluble derivative of bucky ball with HIV-protease , they found that itbinds to the portion of th enzyme that would ordinarily clareve the repreouctive protein , preventing the ` HIV` virus from reproducing . Consequently the virus could no bnolgre infect the human cells they had frown in the laboratory . The buycky ball compound itself is not a suitable drug for use against AIDS because of potential side effects and delivery difficaultes , but it does provide a model for the development of such drugs Consider following statements about bucky ball : A , It is also called fullerene B: It is also called Buckministerfullerene C: Bucky tubes (made of fullerenes ) are several times stronger than stel whnires D: Bucky ball is a plastic polymer Select correct statement (s) :A. `A,C,D`B. `A,B,C`C. `A,B,D`D. `B,C,D`
Answer» Correct Answer - B

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Identify `X` and `Y` in the following reactions . `PbS underset("in air") overset (Heat) (rarr) (X)` `(X) + PbS overset (Y) (rarr) pb+SO_(2)`.
Assertion (A) :` Pb^(+4)` compounds are stronger oxidiising agents than ` Sn^(4+)` compounds . Reason (R): The higher oxidation states for group `14` elements are more stable for the heavier members of the group due to inert pair effect .A. If bothe (A) and ( R) are correct and (R) is correct eplanation of (A)B. If bothe (A) and ( R) are correct and (R) is correct eplanation of (A)C. If (A) is correct , buyt (R) is incrorect .D. If (A) is incrorect byt ( R) is correct .
Assertion (A) :` Pb^(+4)` compounds are stronger oxidiising agents than ` Sn^(3+)` compounds . Reason (R): The higher oxition states for grouup `14` eelments are more stable for the heavier members of the frop due to inert pair effect .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct .
vii. The stability of dihlides of ` Si, Ge , Sn` and Pb increases steadily in the sequence :A. `PbX_(2) lt SnX_(2) lt GeX_(2) ltSiX_(2)`B. `GeX_(2) lt SiX_(2) ltSnX_(2) ltPbX_(2)`C. `SiX_(2)ltGeX_(2) ltPbX_(2) ltSnX_(2)`D. `SiX_(2) ltGeX_(2) ltSnX_(2) ltPbX_(2)`
Assertion: `Pb^(4+)`can be reduced easily to `Pb^(2+)`. Reason: `Pb^(2+)` is paramagnetic.A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incrorect byt (R) is incroroect .
`CO_2` and `H_2 O` absorbs strongly in the infrared rrgion and its presence in the atmospheere dectrases the loss fo heat form the enrth by radistiion . This global warming is called the greenhouse effect (other gases , including the oxides of nitraongen form car exhauset freons from aerosols and refrigeratirs and methane from bacteria in the soil and in the rument cows , also add to the reeenhouse effect ). The concentration fo atmospheric `CO_2` has increased by `10%` . The is rsulting in the increase in the mean temperature fo the earth by `2. 5^@ C`, varying form `2^@ C` t the equlator to `4^@ C` at the poles . This could have dramatic effects on the climate. Instead of monitoring carbon dioxide suggest another gas that scientists could studey to substantiate the fact that ` CO_2` conentration is steadily increasing in the atmosphere ?A. `N_2O`B. `O_2`C. `CH_4`D. `O_3`
`CO_2` and `H_2 O` absorbs strongly in the infrared rrgion and its presence in the atmospheere dectrases the loss fo heat form the enrth by radistiion . This global warming is called the greenhouse effect (other gases , including the oxides of nitraongen form car exhauset freons from aerosols and refrigeratirs and methane from bacteria in the soil and in the rument cows , also add to the reeenhouse effect ). The concentration fo atmospheric `CO_2` has increased by `10%` . The is rsulting in the increase in the mean temperature fo the earth by `2. 5^@ C`, varying form `2^@ C` t the equlator to `4^@ C` at the poles . This could have dramatic effects on the climate. As a result of freenhouse effect , thers can be : A: an increase in rate of egvaporation of water thus, untimely more rain , floodingn tec . B: tropical storms in certain parts of the workd C: a decrease in `pH` of the soil D: an increase in `pH` of the soil select correct altemate :A. `B,C,D`B. `A,C,D`C. `A,B,D`D. `A,B,C`
`CO_2` and `H_2 O` absorbs strongly in the infrared rrgion and its presence in the atmospheere dectrases the loss fo heat form the enrth by radistiion . This global warming is called the greenhouse effect (other gases , including the oxides of nitraongen form car exhauset freons from aerosols and refrigeratirs and methane from bacteria in the soil and in the rument cows , also add to the reeenhouse effect ). The concentration fo atmospheric `CO_2` has increased by `10%` . The is rsulting in the increase in the mean temperature fo the earth by `2. 5^@ C`, varying form `2^@ C` t the equlator to `4^@ C` at the poles . This could have dramatic effects on the climate.Which of the following is growing at a fastre rate than ` CO_2` and thus responsible for the greenhouse effect ?A. `CFC`B. `N_2O`C. `O_3`D. `CH_4`
Assertion (A) : `CO_2` is a gas but `SiO_2` had a three -dimenstional network structurte . Reason (R): `CO_2` bonds nut `SiO_2` has a three-dimensional network structure .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct .
` CO_2` is used for extinguisng fire because it is neither combustible not a supporter of combustion .

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