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प्रश्न
What happens when Borax is heated strongly.
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उत्तर
When heated, borax undergoes various transitions. It first loses water molecules and swells. Then, it turns into a transparent liquid, solidifying to form a glass-like material called borax bead.
\[\ce{\underset{Borax}{Na2B4O7}.10H2O ->[\Delta] \underset{metaborate}{\underset{Sodium}{Na2B4O7}} ->[\Delta] 2NaBO2 + \underset{anhydride}{\underset{Boric}{B2O3}}}\]
संबंधित प्रश्न
Write reactions to justify amphoteric nature of aluminium.
What happens when Boric acid is added to water?
What happens when Aluminium is treated with dilute NaOH?
Give reasons: A mixture of dilute NaOH and aluminium pieces is used to open drain.
Give reasons: Aluminium utensils should not be kept in water overnight.
Give reasons: Aluminium wire is used to make transmission cables.
When metal X is treated with sodium hydroxide, a white precipitate (A) is obtained, which is soluble in excess of NaOH to give soluble complex (B). Compound (A) is soluble in dilute HCl to form compound (C). The compound (A) when heated strongly gives (D), which is used to extract the metal. Identify (X), (A), (B), (C) and (D). Write suitable equations to support their identities.
The type of hybridisation of boron in diborane is ______.
Explain the following:
Gallium has higher ionisation enthalpy than aluminium.
Explain the following:
Aluminium forms [AlF6]3– ion but boron does not form [BF6]3– ion.
Assertion (A): If aluminium atoms replace a few silicon atoms in three-dimensional network of silicon dioxide, the overall structure acquires a negative charge.
Reason (R): Aluminium is trivalent while silicon is tetravalent.
Account for the following observations:
AlCl3 is a Lewis acid
\[\ce{AlF3}\] is soluble in HF only in presence of KF. It is due to the formation of ______.
