Wrapping up d block.... at last..part2

these are ques to which i dont have answers

Write the all possible names of following compounds
1)K3[Co(NO2)6]
a)Fischer salt
b)potassium cobaltnitrite
c)potassium hexanitrocobaltate(III)
d)potassium cobalt nitrite

2)Na2[Fe(CN)5NO]
a)sodium pentacyanonitrosoniumferrate(II)
b)sodium nitroprusside
c)sopdium pentacyanonitrosylferrate(III)
d)sodium notroferrocyanide

Q3K4[Fe(CN)6]
a)potassium ferrocyanide
b)otassium ferricyanide
c)potassium hexacyanoferrate(III)
d)potassium hexacyanoferrate(II)

my ans1=a,b,c
ans2=a,b
ans3=a,d

are they rite

plz correct me if i am wrong

and plzz ignore spelling mistakes above [3][3]