InPO₄^3–,the formal charge one ach oxygen atom and the P–O bond order respectively are-

Resonance is not shown by-

In which of the following compounds resonance does not occurs-
a)H₂O
b)SiO₂
c)SO₃
d)CO₂ Correct answer is–

Which one is the most resonance stabilized amongest the following-

Outofthetwocompoundsshown below,the vapour pressure of (B) at a particular temperatureisexpectedtobe:
and 

The equations of the sides of the Square for which (3, 4), (1, –1) are the end points of a diagonal are

tan (x) = (m1-m2)/(1+m1m2). this gives the relationship between the slope and angle between the two line.

The figure shows energy levels of a certain atom, when the system moves from level 2E to E, a photon of wavelength $\lambda$ is emitted. The wavelength of photon produced during its transition from level 4/3 E to E level is:

An  α-Particle of energy 5 Mev is scattered through 180 by a fixed uranium nuclear The closest distance is in the order of:

Species having zero dipole moment:

Which of the following process are associated with change of hybridization of the underlined compound?
1) Al(OH)₃ ppt. dissolved in NaOH
2) B2H₆ is dissolved in THF
3) SiF₄ vapour is passed through liq. HF
4)Solidification PCl₅ vapour Correct answer is-

The shapes of XeF₄,XeF₅–and SnCl₂ are-

Linear structure is assumed by-
I)NCO^–
II) CS₂
III) NO₂
IV)Solid BeH

Which of the following set is not correct-

The As F₅ molecule is trigonal bipyramidal. The hybrid orbitals used by the As atoms for bonding-

In [Fe(CO)₅], hybrid is at ion state and number of co-ordinate bonds are-

The condition that the equation can take the form  when shifting the origin is

When the roots are equal and real, then the discriminant value of the the quadratic equation becomes 0.