In dry cell, what acts as a negative electrode?
Zinc
Graphite
Ammonium chloride
Manganese dioxide
The reaction takes place in two steps as
Identify the reaction intermediate.
NO2Cl (g)
NO2(g)
Cl2(g)
Cl(g)
The relation between solubility of a gas in liquid at constant temperature and external pressure is stated by which law?
Raoult's law
van't Hoff- Boyle's law
van't Hoff- Charles' law
Henry's law
Identify the metal that forms colourless compounds.
Iron (Z = 26)
Chromium (Z = 24)
Vanadium (Z=23)
Scandium (Z =21)
The rate constant and half-life of a first order reaction are related to each other as
t1/2 = 0.693 k
k = 0.693 t1/2
Which of the following is a neutral complex?
[Pt(NH3)2Cl2]
[Co(NH3)6]Cl3
[Ni(NH3)6]Cl2
K4[Fe(CN)6]
Identify the compound amongst the following of which 0.1 M aqueous solution has highest boiling point.
Glucose
Sodium chloride
Calcium chloride
Ferric chloride
D.
Ferric chloride
All the compounds have same concentration, i.e. 0.1 M. Thus, the compound that will break into the most parts has highest boiling point.
Glucose (1 part, covalent; does not ionise)
Sodium chloride (1 Na, 1 Cl; ionises)
Calcium chloride (1 Ca, 2Cl; ionises)
Ferric chloride (1 Fe, 3Cl; ionises)