Phenolphthalein indicator gets pink colour with

HCl solution with $N{a}_{2}C{O}_{3}andNaHC{O}_{3}Na\_2\backslash ,CO\_3\backslash ,and\backslash ,NaHCO\_3$ produces

Which of the following solutions convert red litmus paper to blue

Which of the following solutions give yellow colour with methyl orange indicator.

The formula of sodium zincate is

Olfactory indicator from the following:

Pair of strong acid and strong base from the following is

Which one of the following produces more $O{H}^{-}OH^-$ ions ?

Which one of the following produces more number of $H_3{O}^{+}ionsH\_3O^+\backslash ,ions$

Which of the following is a weak base?

When Zn is added to aqueous NaOH and on heating it forms

Which one of the following is an acid?

Which of the following indicators gives red colour-in acid solution ?

Which of the following is a mineral acid?

A student added few drops of universal indicator to a given colourless sample and observed the sample turning to red. The nature of sample is