Chemistry
Fill in the blanks:
(a) Dalton used symbol …………… for oxygen and …………… for hydrogen.
(b) Symbol represents …………… atom of an element.
(c) Symbolic expression for a molecule is called …………… .
(d) Sodium chloride has two radicals. Sodium is a …………… radical while chloride is a …………… radical.
(e) Valency of phosphorus in PCl3 is …………… and in PCl5 is …………… .
(f) Valency of Iron in FeCl2 is …………… and in FeCl3 it is …………… .
(g) Formula of iron (III) carbonate is …………… .
Related Questions
Assertion (A): A chemical equation is written to represent molecules.
Reason (R): This is necessary for the law of conservation of mass
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Chemical combination always takes place between two elements.
Reason (R): A single substance is formed in a chemical combination.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Complete the following table.
Acid Radicals →
Basic Radicals ↓Chloride Nitrate Sulphate Carbonate Hydroxide Phosphate Magnesium MgCl2 Mg(NO3)2 MgSO4 MgCO3 Mg(OH)2 Mg3(PO4)2 Sodium Zinc Silver Ammonium Calcium Iron (II) Potassium Name the following compounds and state how many atoms of each kind are present in one molecule of these compounds.
(a) H2SO4
(b) HClO4
(c) K2Cr2O7
(d) KMnO4
(e) K4[Fe(CN)6]
(f) Na2CrO4
(g) Mn3(BO4)2
(h) HNO2