321726 The only radioactive element among the lanthanoids is

321727 The strongest base is

321728 I. The reactivity of actinoid metals increases in their finely divided form.
II. \(\mathrm{\mathrm{HCl}}\) attacks all metals but most are slightly affected by \(\mathrm{\mathrm{HNO}_{3}}\) owing to the formation of protective oxide layers.
III. Alkalies have no action on actinoid metals.
The correct statements are (choose the appropriate option)

321729 Assertion :
\(\mathrm{\mathrm{Sm}^{3+}, \mathrm{Dy}^{3+}}\) have same colour (yellow)
Reason :
Both ions are having same number of unpaired electrons.

321726 The only radioactive element among the lanthanoids is

321727 The strongest base is

321728 I. The reactivity of actinoid metals increases in their finely divided form.
II. \(\mathrm{\mathrm{HCl}}\) attacks all metals but most are slightly affected by \(\mathrm{\mathrm{HNO}_{3}}\) owing to the formation of protective oxide layers.
III. Alkalies have no action on actinoid metals.
The correct statements are (choose the appropriate option)

321729 Assertion :
\(\mathrm{\mathrm{Sm}^{3+}, \mathrm{Dy}^{3+}}\) have same colour (yellow)
Reason :
Both ions are having same number of unpaired electrons.

321726 The only radioactive element among the lanthanoids is

321727 The strongest base is

321728 I. The reactivity of actinoid metals increases in their finely divided form.
II. \(\mathrm{\mathrm{HCl}}\) attacks all metals but most are slightly affected by \(\mathrm{\mathrm{HNO}_{3}}\) owing to the formation of protective oxide layers.
III. Alkalies have no action on actinoid metals.
The correct statements are (choose the appropriate option)

321729 Assertion :
\(\mathrm{\mathrm{Sm}^{3+}, \mathrm{Dy}^{3+}}\) have same colour (yellow)
Reason :
Both ions are having same number of unpaired electrons.

321726 The only radioactive element among the lanthanoids is

321727 The strongest base is

321728 I. The reactivity of actinoid metals increases in their finely divided form.
II. \(\mathrm{\mathrm{HCl}}\) attacks all metals but most are slightly affected by \(\mathrm{\mathrm{HNO}_{3}}\) owing to the formation of protective oxide layers.
III. Alkalies have no action on actinoid metals.
The correct statements are (choose the appropriate option)

321729 Assertion :
\(\mathrm{\mathrm{Sm}^{3+}, \mathrm{Dy}^{3+}}\) have same colour (yellow)
Reason :
Both ions are having same number of unpaired electrons.