Question

6- the chemical formula of carbonate salt contain monovalent cation is ..........

O XCO3
O X2HCO3
O X2CO3
O X(HCO3)2
7- after adding sodium hydroxide into hydrochloric acid, pH will
O Increases
O decreases
O remains constant
8- the reaction between calcium hydroxide and Nitric acid forming ........
o Ca(NO2)2
O Ca(NO3) O Ca(NO3)2
o Ca(NO2)

Answer 1

6-

`{ \sf{XCO _(3) }}`

because X has only one positive charge.

7-

`{ \sf{increases}}`

because there is increase in hydroxyl ions which decrease the acidity or hydrogen strength of hydrochloric acid.

8-

`{ \sf{Ca(NO _(3) ) _(2) }}`

Calcium has a valency of 2 and nitrate ion radicle has valency of 1