1) how many structures are possible for a square planar molecule with a formula of ax2y2?
2)how many structures are possible for a tetrahedral molecule with a formula of ahxyz?

1) Two structures are possible with the molecular formula having square planar geometry.

2) Only one structure is possible for the formula having tetrahederal geometry.

Explanation: For both the cases, we are fixing the position of A-atom which is the central metal atom.

1) When A is fixed and we are ought to surround 2 X and 2 Y-atoms around it. There are 2 possible ways in which can be done.

When both the X-atoms are adjacent to each other, it is known as cis-conformation.

When both the X-atoms are anti to each other, it is known as trans-confirmation.

2) When A is fixed and four different groups are surrounding this atom, only 1 structure is possible which have a tetrahederal geometry.

The structure are shown in the given image below.

answer: - first one is the correct answer. .

explanations: - potassium sulfide is and cobalt(ii) chloride is .

charge on k is +1, charge on s is -2, charge on co is +2 and charge on cl is -1.

in a double replacement reaction the ion exchange takes place. in general the reaction looks like:

if one of the product is insoluble as per solubility rules then a precipitate of it is formed.

when we mix the aqueous solutions of potassium sulfide and cobalt(ii) chloride then chloride ion goes with potassium ion and sulfide ion goes with cobalt ion and the balanced equation is written as:

k and cl has equal charges, similarly co and s has equal charges and hence no subscripts are used for the product side.

as per the solubility rules, cos is insoluble and so it's precipitate is formed.

looking at the given choices, first choice is correct.