X is a substance, which was given red colour ,ivith methyl orange solution and `H_2` gas ,ivlth Zn pieces. What would be X ?

What is your observation when methyl orange solution added to H_2SO_4 ?

The ion which exhibits orange red colour in aqueous solution is

If methyl orange is used as a solution at pH = 2 containing the indicator would be

Which of the following solution can change the colour of methyl orange solution to yellow ?

X' is a substance which gives CO_2 , water and. common salt on adding HCl to it. What would be 'X' ?

There are 3 substances in test tube A, test tub1e B and test tube C. B and C can form A. B and C can form H_2 gas. A, Band C gives different colours ,with universal solution. B turns blue litmus into red but not A and C. What would be A, B and C ?

Solution A gives pink colour when a drop of phenopthalein indicator is added to it. Solution B gives red colour when a drop of methyl orange is added to it. What type of solutions are A and B and which one of the solutions A and B will have a higher pH value?