Practical Chemistry Mock Tests

The number of atoms present in one molecule of Na₂S₂O₃·5H₂O is:

Which of the following statements is NOT correct about the adsorption of a gas on a solid surface?

A white precipitate is obtained when H₂S gas is passed through an acidic solution containing a salt. The precipitate is soluble in hot dilute HNO₃. The cation present is:

In the qualitative analysis of cations, H₂S gas is passed through an acidic solution containing Cu²⁺, Zn²⁺, and Mn²⁺. Which sulfide precipitates first?

A primary standard used to standardize NaOH is:

When H₂S gas is passed through an aqueous solution containing Cu²⁺, Zn²⁺, and Mn²⁺ ions in acidic medium (dil. HCl), which precipitate is formed?

Which of the following is an example of a lyophobic colloid?

Which cation gives a brick-red colour in a flame test?