class 12

Missing

JEE Main

The molecular formula of a commercial resin used for exchanging ions in water softening is $C_{8}H_{7}SO_{3}Na$ (Mol. Wt. 206). What would be the maximum uptake of $Ca_{2+}$ ions by the resin when expressed in mole per gram resin ?

Connecting you to a tutor in 60 seconds.

Get answers to your doubts.

The angle between the lines whose direction cosines satisfy the equations $l+m+n=0$and $l_{2}=m_{2}+n_{2}$is

The sum of first 20 terms of the sequence 0.7, 0.77, 0.777, .. , is

A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of $CO_{2}.$ The empirical formula of the hydrocarbon is:

The expression $1−cotAtanA +1−tanAcotA $can be written as

If $y=sec(tan_{−1}x)$, then $dxdy $at $x=1$is equal to

A circular loop of radius 0.3 cm lies parallel to a much bigger circular loop of radius 20 cm. The centre of the small loop is on the axis of the bigger loop. The distance between their centres is 15 cm. If a current of 2.0 A flows through the smaller loop, then the flux linked with bigger loop is

Locus of the image of the point (2, 3) in the line $(2x−3y+4)+k(x−2y+3)=0,kϵR$, is a :

Diameter of plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is $2×10_{8}m/s,$ the focal length of the lens is :