Which one of the following orders is not in accordance with the property stated against is ? 
Bond dissociation energy of fluorine is less because of its small size and repulsion between electrons of two atoms. So option (c) is wrong order. The correct order is [Cl2 > Br2 > F2 > I2]
Which one of the following orders correctly represents the increasing acid strengths of the given acids? 
As the oxidation number of the central atom increases, strength of acid also increases.
Which one of the following arrangements does not give the correct picture of the trends indicated against it ? 
From the given options we find option (a) is correct. The oxidising power of halogens follow the order F2 > Cl2 > Br2 > I2 . Option (b) is incorrect because it in not the correct order of electron gain enthalpy of halogens. The correct order is Cl2 > F2 > Br2 > I2 . The low value of F2 than Cl2 is due to its small size. Option (c) is incorrect. The correct order of bond dissociation energies of halogens is Cl2 > Br2 > F2 > I2 . Option (d) is correct. It is the correct order of electronegativity values of halogens. Thus option (b) and (c) are incorrect.
In the case of alkali metals, the covalent character decreases in the order: 
MI > MBr > MCl > MF. As the size of the anion decreases covalency decreases.
Among the following which is the strongest oxidising agent? 
Standard reduction potential of halogens are positive and decreases from fluorine to iodine. Therefore halogens act as strong oxidising agent and their oxidising power decreases from fluorine to iodine.
The correct order of increasing bond angles in the following species are : 
The correct order of increasing bond angle is
* In ClO2– there are 2 lone pairs of electrons present on the central chlorine atom. Therefore the bond angle in ClO2– is less than 118° which is the bond angle in ClO2 which has less number of electrons on chlorine.
Oxidation states of P in H4 P2O5 , H4 P2O6 , and H4 P2O7 , are respectively: 
The correct answer is Option D.
Which one of the following compounds is a peroxide ? 
KO2 is known as potassium superoxide. It is paramagnetic in nature. It is formed by the direct reaction of oxygen gas and potassium metal. ... BaO2 is a peroxide because in BaO2 the oxidation state of barium is +2 and oxygen has oxidation number −1.
Match List - I (substan ces) with List - II (processes) employed in the manufacture of the substances and select the correct option. 
(a) Sulphuric acid (iv) Contact process
(b) Steel (ii) Bessemer ’s process
(c) Sodium hydroxide(iii) Leblanc process
(d) Ammonia (i) Haber ’s process
∴ Correct choice : (a)
How many bridging oxygen atoms are present in P4O10? 
∴ Correct choice : (b)
Which of the following structures is the most preferred and hence of lowest energy for SO3 ? [2011 M]
Formal charges help in the selection of the lowest energy structure from a number of possible Lewis structures for a given compound. The lowest energy structure means the structure with the smallest formal charge on each atom of the compound. A Lewis dot structure is preferable when all formal charges are zero.
Which of the following oxide is amphoteric ?
SnO2 is an amphoteric oxide because it reacts with acids as well as bases to form corresponding salts.
In which of the following compounds, nitrogen exhibits highest oxidation state ? 
Thus, nitrogen exhibits highest oxidation state in N3H
Thus question can also be credited to redox reactions
Which of the following statements is not valid for oxoacids of phosphorus? 
(H3PO2) is a monobasic acid. i.e., it has only one ionisable hydrogen atom or one OH is present
Sulphur trioxide can be obtained by which of the following reaction : 
Which is the strongest acid in the following : [NEET 2013]
HClO4 is the strongest acid amongst all because the oxidation state or Cl is maximum (+7).
Which of the following does not give oxygen on heating? [NEET 2013]
Which of the following is a polar molecule ? [NEET 2013]
SF4 has 4 bond pairs and 1 lone pair of electrons, sp3d hybridisation leads to irregular shapeand resultant
μ ≠ 0.
Identify the incorrect statement, regarding the molecule XeO4: [NEET Kar. 2013]
In which of the following arrangements the given sequence is not strictly according to the property indicated against it ? [2012 M]
If acidic nature is high, Ka is high and pka is low
since pka = – log ka
Hence the order of pka will be H2O > H2S > H2Se > H2Te