The incorrect statement is :

When XO2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3 ; a dark green product is formed which disproportioates in acidic solution to afforda dark purple solution. X is :

In the molecular orbital diagram for the molecular ion, N2+, the number of electrons in the $$\sigma$$2pz molecular orbital is :

Total number of lone pair of electrons in $${\mathrm{I}}_3^{-}$$ ion is

Which of the following compounds contain(s) no covalent bond(s)? KCl, PH3, O2, B2H6, H2SO4

According to molecular orbital theory, which of the following will not be a viable molecule?

Which of the following conversions involves change in both shape and hybridisation ?

The incorrect geometry is represented by :

Which of the following best describes the diagram below of a molecular orbital ?

In hydrogen azide (above) the bond orders of bond (I) and (II) are :

The decreasing order of bond angles in BF3, NH3, PF3 and I3- is :

Identify the pair in which the geometry of the species is $$T$$-shape and square - pyraidal, respectively :

Which of the following is the correct structure of Adenosine?

Glucose on prolonged heating with HI gives

The predominant form of histamine present in human blood is (pKa, Histidine = 6.0)

Among the following, the incorrect statement is :

The dipeptide, Gln-Gly, on treatment with CH3COCl followed y aqueous work up gives :

If $$5\left({\tan }^{2}x-{\cos }^{2}x\right)=2\cos 2x+9$$, then the value of $$\cos 4x$$ is :

For two 3 × 3 matrices A and B, let A + B = 2BT and 3A + 2B = I3, where BT is the transpose of B and I3 is 3 × 3 identity matrix. Then :

If S = \left\{ {x \in \left[ {0,2\pi } \right]:\left| {\matrix{ 0 & {\cos x} & { - \sin x} \cr {\sin x} & 0 & {\cos x} \cr {\cos x} & {\sin x} & 0 \cr } } \right| = 0} \right\}, then \sum\limits_{x \in S} {\tan \left( {{\pi \over 3} + x} \right)} is equal to :