Advertisements
Advertisements
प्रश्न
The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B, C and D
उत्तर
Copper sulphate crystals (A) are blue and have the chemical formula CuSO4.5H2O. When copper sulphate crystals are heated strongly, they lose all the water of crystallisation (B) and form anhydrous copper sulphate (C), which is white.
A C B
CuSO4.5H2O → CuSO4 + 5H2O
Anhydrous copper sulphate turns blue on addition of a few drops of water (D) because it gets hydrated again.
C D
CuSO4 + 5H2O → CuSO4.5H2O
APPEARS IN
संबंधित प्रश्न
What are the two main ways in which common salt (sodium chloride) occurs in nature?
Name three chemicals made from common salt (or sodium chloride).
Give any two uses of common salt (sodium chloride).
The salt whose aqueous solution will have no effect on either red litmus or blue litmus is
(a) potassium sulphate
(b) sodium carbonate
(c) ammonium sulphate
(d) sodium acetate
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
red litmus blue?
Give one example of a salt which gives an aqueous solution having:
pH more than 7
Consider the following salts:
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH4)2SO4
Which of salts will give:
neutral solutions?
Name two carbonates do not produce carbon dioxide on heating.
Identify the following substance:
Gas C has an offensive smell like rotten eggs.
Differentiate hydrate and anhydrous salts with examples.
