Invar, an alloy of Fe and Ni is used in watches and meter scale. Its characteristic property is
small coefficient of expansion
resistance of corrosion
hardness and elasticity
magnetic nature
Aqua-regia is obtained by mixing two different acids in the ratio :
1HNO3: 3HCl
2HNO3: 2HCl
1HNO3: 2HCl
3HNO3: 1HCl
A compound with cubic structure is made of elements A and B. A atoms are at the corners of the cube and B atoms are at the face centres. The simplest formula of the compound is :
A5B
AB3
AB
AB6
Colligative properties are used for the determination of :
molar mass
equivalent weight
arrangement of molecules
melting point and boiling point
A.
molar mass
The study of colligative properties is useful in calculating the molecular masses of dissolved substances.
Identify the mixture that shows positive deviation from Raoult's law :
CHCl3 + (CH3)2CO
(CH3)2CO + C6H5NH
CHCl3 + C6H6
(CH3)2CO + CS2
If ΔG for a reaction is negative, you infer that the change is :
spontaneous
non-spontaneous
reversible
irreversible
Zn(s) | Zn2+(aq)|| Cu2+(aq) | Cu(s) is :
(anode) (cathode)
Weston cell
Daniel cell
Faraday cell
Standard cell
An important industrial solvent, also a laboratory reagent called 2-butanone is nothing but:
methyl ethyl ketone
methyl propyl ketone
dimethyl ketone
diethyl ketone
The catalyst used for the polymerization of olefins is :
Ziegler-Natta catalyst
Wilkinson's catalyst
Pd-catalys
Zeise's salt catalyst