Then final products N and O are respectively.
(a) CuSO4(aq.) 2CuS [Cu(CN)4]3-+(CN)2
Black ppr.(M) (N) (O)
When steam is passed over red hot iron , the substances formed are:
(a) Fe2O3 +H2
(b) Fe3O4 +H2
(c) FeO +H2
(d) FeO+ H2 +O2
Iron does not react with water in the ordinary temperature. It reacts only with steam. When steam is passed over red-hot iron, iron (II,III) oxide and hydrogen gas are formed.
Which of the following solid salt on heating with K2Cr2O7 and Conc. H2SO4 orange,red vapours are evolved which turn aquous NaOH solution yellow?
(b) NaCl(s) + K2Cr2O7 + H2SO4 (few drops)CrO2Cl2+H2O
CrO2Cl2 + OH-(aq.)CrO4(aq)2-+Cl-+2H2O
Consider the following transformation:
Then X- can be :
(c) Cu(CN)2 and CuI2 being unstable spontaneously decomposes into CuCN and CuI respectively at room temperature
Fe is made passive by :
(a) dil . H2SO4
(b) dil. HCl
(c) Conc. HNO3
(d) Conc. H2SO4
(b) Chloroplatinic acid is H2[PtCl6],which is dibasic
The iron salt used in blue prints is:
(a) 2CrO42-+2H+Cr2O72- +H2O
Which has highest melting point?
(1) Greater than number of unpaired electrons, more is the covalency and higher is the melting point
Which of the following element does not show the variable oxidation state?
(4) Pseudo transition element have 10 electro in d subshell , so cannot lose electron from d subshell.