Which of the following gas is used as Holmes signal?

What is the oxidation state of phosphorus in hypophosphoric acid?

When a flask containing sodium thiosulfate is placed over a paper marked with ‘X’ and HCl added to it, the ‘X’ seems to …

Which of the following is the displays the most basic nature in water?

What is the allotrope of phosphorus in which P-atom completes its octet?

Which of the following statement regarding PCl3 is false?

What catalyst is used for oxidation of ammonia to produce nitric acid?

Which of the following is the correct order of acidic strength?