When MnO2 is heated with PbO2 and conc. HNO3 pink colour is obtained due to formation of
KMnO4
HMnO4
Pb(MnO4)2
PbMnO2
In nitroprusside ion, the iron and NO as Fe2+ and NO+ rather than Fe3+ and NO. These forms can be differentiated by
estimating the concentration of iron
measuring the concentration of CN-
measuring the solid state magnetic moment
thermally decomposing the compound
Which of the following compounds gives PELIGOT's salt with chromyl chloride?
Borax
Oxone
Sylvine
Trona
Mark the wrong statement. When Na2S is added to sodium nitroprusside solution,
beautiful violet colour is produced
a complex [Fe(CN)5NOS]4- is formed
a complex [Fe(CN)5NOS]2- is formed
a complex [Fe(CN)5NOS] is formed
Stainless steel does not rust because
chromium and nickel combine with iron
chromium forms an oxide layer and protects iron from rusting
nickel present in it, does not rust
iron forms a hard chemical compound with chromium present in it
The atomic number of Ni and Cu are 28 and 29 respectively. The electronic configuration. 1s22s22p63s23p63d10 represents.
Cu+
Cu2+
Ni2+
Ni
Which of the following types of metals form the most efficient catalysts ?
Alkali metals
Alkaline earth metals
Transition metals
All of the above
C.
Transition metals
Many of the d-block (Transition) elements and their compounds act as catalyst. Catalytic property is probably due to the utilisation of (n-1) d orbitals or formation of interstitial compounds.