P Block Elements

Sulphur dioxide is one of the components of polluted air. SO₂ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO₂ is

In white phosphorous (P₄) if x is total number of triangle y is total number of plane of symmetry z is total number of P-P bond then calculate value of <!-- [if gte mso 9]><xml> </xml><![endif]-->  $\frac{\left(y+z\right)}{x}.$

How many of the following reagent/s will liberate at least one oxide of nitrogen as a product?

(i) Ag + conc. HNO₃

(ii) Sn + dil., HNO₃ (20%)

(iii) Cu + conc. HNO₃

(iv) C + conc. HNO₃

(v) Zn + conc. HNO₃

(vi) Zn + dil. HNO₃ (20%)

(vii) P₄ + conc. HNO₃

(viii) S₈ + conc. HNO₃

(ix) Cu + dil. HNO₃ (20%)

Which of the following is correct:

The reaction of sulphur in alkaline medium is given below

$S_{8\left(s\right)}+aO{H^{-}}_{\left(aq\right)}\to b{S^{2-}}_{\left(aq\right)}+c{S}_2{O_3^{2-}}_{\left(aq\right)}+d{H}_2{O}_{\left(I\right)}$     <!-- [if gte mso 9]><xml> </xml><![endif]--> 

The values of ‘a’ is____________. (Integer answer)

Al₂O₃ was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are:

White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of:

Given below are two statements:

Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II :  Cuprous metaborate is obtained by heating boric anhydride and copper sulpahte in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below

Which of the following statements are INCORRECT?
A. All the transition metals except scandium form MO oxides which are ionic.
B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in Sc₂O₃ to Mn₂O₇.
C. Basic character increases from V₂O₃ to V₂O₄ to V₂O₅.
D. V₂O₄ dissolves in acids to give VO₄³⁻ salts.
E. CrO is basic but Cr₂O₃ is amphoteric.

Choose the correct answer from the options given below:

The number of compounds/species which obey Huckel's rule is
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