State the following pertaining to the physical properties of hydrogen.
a. colour & odour b. solubility in water c.Effect on moist blue litmus paper.

State which of the following 1 to 5 pertain to A: Physical Change B: Chemical change: Sublimation

State which of the following 1 to 5 pertain to A: Physical Change B: Chemical change: Respiration

State which of the following 1 to 5 pertain to A: Physical Change B: Chemical change: Fermentation

State which of the following 1 to 5 pertain to A: Physical Change B: Chemical change: Liquefaction or condensation.

State which of the following 1 to 5 pertain to A: Physical Change B: Chemical change: Magnetization

Arrange the following : i. In the decreasing order of the pK_(b) values: In the increasing order of solubility in water. Aniline, (C_(2)H_(5))_(2)NH , and C_(2)H_(5)NH_(2)

The elements of group 1 describe, more clearly then only group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties.The chemical and physical properties of the elements are closely related to their electronic structures and sizes.These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts.In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material. Which of the following has the highest solubility in water ?

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ) . The oxidation state of central metal ions of (A), (B) and (C ) compounds are respectively :

Explain the following observation: a. Lyphilic colloid is more stable than lyophobic colloid. b. Coagulation takes place when sodium chloride solution is added to a colloidal solution of ferric hydroxide. c. Sky appears blue in colour.

(a) Describe the general trends in the following properties of the first series of the transition elements: (i) Stability of +2 oxidation state (ii) Formation of oxometal ions (b) Assign reason for each of the following: (i) Transition elements exhibit variable oxidation states. (ii)Transition metal ions are usually coloured