Question

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Answer 1

Construction-

Draw RB parallel to ST

Solution-

considering RS as transversal

<TSR+ <SRB= 180

. . . . . . . . .(angle on same side of transversal)

130+<SRB= 180

<SRB= 180-130

<SRB=50

Now taking QR as transversal

<PQR = <QRB . . . .(Alternate angle)

<PQR= 110

<QRS+<SRB = <QRB. . .(from figure)

<QRS+ 50= 110

<QRS= 110-50

<QRS= 60

Answer 2

Step-by-step explanation:

It's chemical formula is H3O+. It can also be formed by the combination of a H+ ion with an H2O molecule. The hydronium ion has a trigonal pyramidal geometry and is composed of three hydrogen atoms and one oxygen atom. There is a lone pair of electrons on the oxygen giving it this shape.