Which compound is soluble in water? lead(ii) carbonate nickel(ii) chloride iron(iii) hydroxide copper(ii) sulfide

Nickel(II)chloride

Explanation: As per solubility rules, except alkali metals and ammonium ion the carbonates, hydroxides and sulfides are mostly insoluble.

So, lead(II)carbonate, Iron(III)hydroxide and copper(II)sulfide are insoluble.

Chlorides are soluble. Hence, the only correct choice is nickel(II)chloride.

If we take a look at the solubility chart then it also makes this clear. Solubility chart could be found in the books and online also.

True

Explanation:

The scientific investigation is a fact finding process to determine the cause of natural processes occurring all over the world or the entire universe. The scientific investigation is conducted using scientific method. The scientific method includes the steps such as studying the background literature, making an observation, framing a question, making of hypothesis, making a prediction, testing the hypothesis by experimentation, and concluding the results.

All these seven steps are useful for every scientific investigation. As these appropriate and necessary to answer a scientific question.