Activity of cambium is different in two seasons and xylem vessels formed have narrow and widal lumens. Give the type of wood formed during the different seasons.

A table showing the average quantity of urine in a person in two different seasons are given. Compare it. Do you agree with this table? State the reason for producing different Quantity in different season.

P,Q,R,S are four elements. Their atomic numbers are 8,17,12 and 16 respectively. Find the type of chemical bond in these compounds formed by combining the following pairs of elelments. Construct and exhibit the type of bonds using different substances (eg. pearls) (Electronegativity values: P=3.44,Q=3.16,R=1.31, S=2.5) . Q,R

P,Q,R,S are four elements. Their atomic numbers are 8,17,12 and 16 respectively. Find the type of chemical bond in these compounds formed by combining the following pairs of elelments. Construct and exhibit the type of bonds using different substances (eg. pearls) (Electronegativity values: P=3.44,Q=3.16,R=1.31, S=2.5) . P,R

P,Q,R,S are four elements. Their atomic numbers are 8,17,12 and 16 respectively. Find the type of chemical bond in these compounds formed by combining the following pairs of elelments. Construct and exhibit the type of bonds using different substances (eg. pearls) (Electronegativity values: P=3.44,Q=3.16,R=1.31, S=2.5) . P,S

The electronegativity values of two elements are given below. (C=2.55 H = 2.20 ) Which type of compound will be formed if these two elements combine together? Give reason.

Out of 100 students,two sections of 40 and 60 are formed.If you and your friend are among the 100 students,what is the probability that : You both enter the different section?

Primary alkyl halide C_4 H_9 Br (a) reacted with alcoholic K O H to give compound (b). Compound (b) is reacted with HBr to give (c) which is an isomer of (a). When (a) is reacted with sodtum metal it gives compound (d), C_ 8 H_ 18 which, is different from the compound formed when n-butyl bromide is reacted with sodium. Give the structural formula of (a) and write the equations for all the reactions.