Sulphur

Q.

Name a few elements that exhibit electrova­lency.

Q. 10g of impure sample of CaCO3 requires 4.38g HCl for complete neutralisation . The percentage purity of the sample is ?

Q. 79 Which of the following nitrogen hallide behave as weakest base ? 1)NF3 2)NCl3 3)NBr3 4)NI3