the groupby clause combines all records that have identical value in a particular field or a group of fields.

in 1st case only d sum condition will be checked

but in d 2nd the condition for each grade grouped will also be checked.

also in 2nd case the having clause is used since having clause works only wid groups.

hope im rite!!

let A={1,2,3}. then no. of relations containg {1,2} and {1,3}which r symmetric and reflexive but not transitive are??

ans is 1  . how come just one?and how is it??

will rate.

A girl walks 4km westward,then she walks 3km in a direction 30 degree east of north and stops.determine the girls displacement  from her initial point of departure.

Plzz reply.

so the final n value in the x n y eq. is 2*3=6.coz eq.1 is multiplied wid 2 n eq.2 is multiplied wid 3.AM I rite??

And also wat is n for the reaction,

2Fe³⁺+2I^-       2Fe²⁺+I₂

1.why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding??

 

2.Chromium grp elements have the highest melting point in their respective series?explain.

 

please replyy.

Optically active 2-bromobutane on treatment with aq.KOH gives a product which does not show optical activity.write the mechanism involved for the reaction.

 

Also is it an  SN1 or an SN2 reaction??? 

 

the rate of a reaction is given by the equation ,

Rate=k[A]²[B]²

What are the units for rate and rate constant for this reaction??

just heard about this 20% critical thinking inroduced by the board recently.Is it applicable for the march 2008 boards??? 

Plzzz reply .

The angle of dip at a location in southern india is about 18 degrees. Would u expect a greater or a smaller dip angle at Britain??

 

Please give the explanation for the answer too.