Metal M is a bluish grey metal with a high density ( $11.34 g / m l$ at room temperature). It readily dissolves in moderately concentrated nitric acid $(8 M)$ and nitric oxide is formed. A solution of metal nitrate on reaction with dilute $H C l$ form white ppt $‘ Q^{'}$ which is soluble in hot water. When $M^{2 +}$ reacts with ammonia solution, it forms a precipitate $R$ which is insoluble in excess of the reagent. $M^{2 +}$ reacts with NaOH and forms the same precipitate $R$ but $R$ dissolves in excess of $N a O H$ forming compound $S .$

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The correct option is B A
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An aqueous solution of metal ion M1 reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M2 always forms tetrahedral complexes with these reagents. Aqueous solution of M2 on reactionn with reagent S gives white precipitate which dissolves in excess of S. The reactions are summarised in the scheme given below:
SCHEME:

Reagent S is

Q. When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z.
(a) What are X, Y and Z?
(b) Write equations for the reactions which take place:
(i) when limestone reacts with dilute HCl
(ii) when gas X reacts with lime water to form white precipitate Y
(iii) when excess of gas X dissolves white precipitate Y to form a soluble compound Z

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An aqueous solution of metal ion M1 reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M2 always forms tetrahedral complexes with these reagents. Aqueous solution of M2 on reaction with reagent S gives white precipitate which dissolves in excess of S. The reactions are summarised in the scheme given below:
SCHEME:

M1, Q and R, respectively are

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The correct option is B ANO SOLUTION

The correct option is B A
NO SOLUTION