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2021-12-25 21:25:11 Notes on s-Block Elements:

Physical Properties of Alkali Metals:

These are soft in nature and can be cut with the help of knife except the lithium.
The atoms of alkali metals have the largest size in their respective periods.
The first ionization energy of the alkali metals are the lowest as compared to the elements in the other group.
The alkali metals show +1 oxidation state.
The alkali metals have low values of reduction potential (as shown in table-I) and therefore have a strong tendency to lose electrons and act as good reducing agents.
The melting and boiling points of alkali metals are very low because the intermetallic bonds in them are quite weak.

Hydroxides of Alkali Metals:

a)All the alkali metals, their oxides, peroxides and superoxides readily dissolve in water to produce corresponding hydroxides which are strong alkalies.

2Na + 2H2O → 2NaOH + H2

Na2O + 2H2O 2NaOH

Na2O2 + 2H2O → 2NaOH + H2O2

2KO2 + 2H2O → 2KOH + H2O2 + O2

b) The basic strength of these hydroxides increases as we move down the group Li to Cs.
c) All these hydroxides are highly soluble in water and thermally stable except lithium hydroxide.
d) Alkali metals hydroxides being strongly basic react with all acids forming salts.

NaOH + HCI → NacI + H2O
2NaOH + H2 SO4 → Na2SO4 + 2H2O

Halides of Alkali metals:
M2O + 2HX → 2MX + H2O
MOH + HX → MX + H2O
M2CO3 + 2HX → 2MX + CO2 + H2O (M = Li, Na, K, Rb or Cs)

(X = F, Cl, Br or I)
ll the alkali metals form ionic (electrovalent) compounds.
The alkali metals are good conductors of heat and electricity.
Alkali metals (except Li) exhibit photoelectric effect
The alkali metals and their salts impart a characteristic colour to flame. Open / Comment

2021-12-25 15:47:41 𝘾𝙃𝙀𝙈𝙄𝙎𝙏𝙍𝙔 𝐇𝐀𝐍𝐃𝐖𝐑𝐈𝐓𝐓𝐄𝐍 𝐍𝐎𝐓𝐄𝐒

𝐂𝐋𝐈𝐂𝐊 𝐎𝐍 𝐓𝐇𝐄 𝐂𝐇𝐀𝐏𝐓𝐄𝐑 𝐍𝐀𝐌𝐄 𝐓𝐎 𝐆𝐄𝐓 𝐓𝐇𝐄 𝐍𝐎𝐓𝐄𝐒 𝐋𝐈𝐍𝐊

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2021-12-24 20:58:13 𝒲𝒾𝓈𝒽𝒾𝓃𝑔 𝓎𝑜𝓊 𝒶 𝒞𝒽𝓇𝒾𝓈𝓉𝓂𝒶𝓈 𝓉𝒽𝒶𝓉'𝓈 𝓂𝑒𝓇𝓇𝓎 𝒶𝓃𝒹 𝒷𝓇𝒾𝑔𝒽𝓉....

𝑀𝒶𝓎 𝓉𝒽𝑒 𝓉𝓌𝒾𝓃𝓀𝓁𝒾𝓃𝑔 𝓁𝒾𝑔𝒽𝓉𝓈 𝑜𝒻 𝒞𝒽𝓇𝒾𝓈𝓉𝓂𝒶𝓈 𝒻𝒾𝓁𝓁 𝓎𝑜𝓊𝓇 𝒽𝑒𝒶𝓇𝓉 𝓌𝒾𝓉𝒽 𝒽𝑜𝓅𝑒. 𝑀𝒶𝓎 𝒮𝒶𝓃𝓉𝒶 𝒞𝓁𝒶𝓊𝓈 𝒷𝓇𝒾𝓃𝑔 𝓎𝑜𝓊 𝑒𝓋𝑒𝓇𝓎𝓉𝒽𝒾𝓃𝑔 𝓎𝑜𝓊 𝓌𝒶𝓃𝓉𝑒𝒹. 𝑀𝒶𝓎 𝓎𝑜𝓊𝓇 𝓎𝑒𝒶𝓇 𝒷𝑒 𝒻𝓊𝓁𝓁 𝑜𝒻 𝒿𝑜𝓎. 𝒯𝒽𝑒𝓈𝑒 𝒶𝓇𝑒 𝓂𝓎 𝓌𝒾𝓈𝒽𝑒𝓈 𝒻𝑜𝓇 𝓎𝑜𝓊 𝑜𝓃 𝓉𝒽𝒾𝓈 𝒿𝑜𝓎𝑜𝓊𝓈 𝒹𝒶𝓎.

𝐌𝐄𝐑𝐑𝐘 𝐂𝐇𝐑𝐈𝐒𝐓𝐌𝐀𝐒 Open / Comment

2021-12-23 21:14:39 GAS LAW
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