Let be a unit vector perpendicular to unit vectors inclined at an angle a, then is

Let be three non-coplanar vectors and be a non-zero vector which is perpendicular to and is represented as . Then

Let OPQR is a tetrahedron such that O is origin and are position vectors of P, Q, R respectively and a is the angle which OP makes with face PQR then

Hence required angle is 2.

On strong heating Mgcl₂  6H₂ Othe product obtained is

Which one of the following hydroxide is insoluble in water?

Which is the incorrect statement?

Which salt can be used to identify coloured cation?

Which will give on heating?

Some of alkali metal salts are coloured. yellow, pink, green. It is due to

The equation of the hyperbola whose foci are (6, 4) and (–4, 4) and eccentricity 2 is given by

Mg and Li are similar in their properties due to

When an electron makes a transition from state to state, the frequency of emitted radiations is related to according to

The binding energy of an element is 64 Mev. If BE/nucleon is 6.4, then the number of nucleons are

The ionization potential hydrogen atom is . The energy required to remove an electron in the state of the hydrogen atom is

In nuclear reaction, The mass loss is nearly 0.02 amu. Hence, the energy released (in units of million kcal/mol) in the process is approximately

There are of and of in a rock. If of is age of the rock is