In $$A{l_2}{O_3},S{b_2}{O_3},B{i_2}{O_3}$$ and $$Se{O_2},B{i_2}{O_3}$$ is most basic oxide. As across the period basic nature of oxide decreases and on moving down the group it increases.
$$B{i_2}{O_3} + 6HCl \to 2BiC{l_3} + 3{H_2}O$$
493.
Which property of $$C{O_2}$$ makes it of biological and geochemical importance?
Its low solubility in water makes it of biological and geo-chemical importance. It forms carbonic acid with water which dissociates to give $$HCO_3^ - $$ ions. $${H_2}C{O_3}/HCO_3^ - $$ buffer system helps to maintain $$pH$$ of blood between 7.26 - 7.42.
494.
Which of the following statements is false?
A
Radon is obtained from the decay of radium
B
Helium is inert gas
C
Xenon is the most reactive among the rare gases
D
The most abundant rare gas found in the atmosphere is helium
Answer :
The most abundant rare gas found in the atmosphere is helium
$$Pb{O_2}$$ is a powerful oxidizing agent and liberate $$\,{O_2}$$ when
treated with acids.
$$2Pb{O_2} + 4HN{O_3} \to 2Pb{\left( {N{O_3}} \right)_2} + 2{H_2}O + {O_2} \uparrow $$
496.
A gas $$(X)$$ is obtained when copper reacts with dilute $$HN{O_3}.$$ The gas thus formed reacts with oxygen to give brown fumes of $$\left( Y \right).$$ $$\left( Y \right)$$ when dissolved in water gives an important acid $$(Z)$$ and the gas $$(X).$$ $$X, Y$$ and $$Z$$ respectively are
$$\,CsB{r_3}$$ may be represented as $$C{s^ + }Br_3^ - $$
498.
Regarding $${F^ - }$$ and $$C{l^ - }$$ which of the following statement $$(s)$$ is/are correct?
$$\left( {\text{i}} \right)C{l^ - }$$ can give up an electron more easily than $${F^ - }.$$
$$\left( {{\text{ii}}} \right)C{l^ - }$$ is a better reducing agent than $${F^ - }.$$
$$\left( {{\text{iii}}} \right)C{l^ - }$$ is smaller in size than $${F^ - }.$$
$$\left( {{\text{iv}}} \right){F^ - }$$ can be oxidised more readily than $$C{l^ - }.$$
The electronegativity of $${F^ - }$$ $$ion$$ is high, so it accept an electron and $$C{l^ - }$$ $$ion$$ can give an electron more easily. Also the size of $${F^ - }$$ is smaller than chloride ion $$\left( {C{l^ - }} \right).$$
499.
Which one of the following is correct pair with respect to molecular formula of xenon compound and hybridization state of xenon in it ?
Disulphuric acid $$\left( {{H_2}{S_2}{O_7}} \right)$$ is called oleum or fuming sulphuric acid. It is strongest oxidising agent and more powerful dehydrating agent.