CrO₅ is cromium with four peroxy oxygen and one cordinated oxygen. it is butterfly type structure .central cromium surround with 4 peroxy cyclic oxygen and 1 cordinate oxygen. In this oxidation number of cromium is +6

The Parliament controls the executive in the following ways:
(i) The Prime Minister and the other ministers are taken from the Parliament and after becoming ministers, they remain
the members of the Parliament. They participate in the meetings of the Parliament.
(ii) The ministers are responsible to the Parliament for their actions and policies.
(iii) The members of the Parliament can ask the ministers questions regarding the functioning of the administration. The
ministers are to give a satisfactory reply to all these questions.
(iv) The members of the Parliament by introducing ‘Adjournment Motion’ can invite the attention of the Government to a
serious problem or event.

Unit Cell is the smallest part (portion) of a crystal lattice. It is the simplest repeating unit in a crystal. The entire lattice is generated by the repetition of the unit cell in different directions.
Primitive Unit Cells: When the constituent particles occupy only the corner positions, it is known as Primitive Unit Cells.
Centered Unit Cells: When the constituent particles occupy other positions in addition to those at corners, it is known as Centred Unit Cell.

Main sources of the secondary data can be classified into two groups :
1. Published sources :
(a) Government Publications
(b) Semi-government Publications
(c) International Publications
(d) Private Publications
(e) Research Publications
2. Unpublished sources : Secondary Data can be obtained from unpublished sources, because all statistical material is not always published. Studies made by research institutions, scholars etc. can be important sources of secondary data.

Newton’s Third Law

To every action, there is always an equal and opposite reaction.

For example, when you hold the ball, a force acts on the ball (Action), and an equal and opposite force acts on your hand (Reaction).

• Action & Reaction forces always act on different bodies
  • F_AB = F_BA
  • F_AB: Force acting on A by B
  • F_BA: Force acting on B by A
• Action & Reaction forces occur at the same instant

BH₃  molecule is electron deficient in nature as the B atom has only 6 electrons around it so it exist in the form of dimer i.e. B₂H₆. BF₃ is also electron deficient but because of larger size of F atom it can not undergo dimerization.

c) Even though Fluorine has the highest electronegativity among all the  elements and it should have the highest electron gain enthalpy among all  the halogens but  this is an exception and chlorine has higher electron gain enthalpy than Fluorine.   The reason for this is that the size of Fluorine atom is very small and  hence there is very high inter-electronic repulsion among the electrons  of fluorine.  This makes incoming of another electron not very favourable.  Even though fluorine has large negative electron gain enthalpy but for chlorine its even more negative.

Photoelectric effect: J.J. Thomson observed that when light of a certain frequency strikes the surface of a metal, electrons are ejected from the cathode metal. They completed the circuit through the gas in the tube which was otherwise a non-conductor. This phenomenon is called photoelectric effect. Only a few metals show this effect under the action of more energetic ultraviolet light is a discharge tube at low voltage.

The term ‘yoga’ is derived from a Sanskrit word ‘Yuj’ which means join or union. In fact, joining the individual self with the divine or universal spirit is called yoga.

Patanjali: ‘Checking the impulses of mind is Yoga.’

Mahrishi Ved Vyas: ‘Yoga is attaining trance.’