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When diborane reacts with the ammonia it forms borazine on strong heating, which is also called inorganic benzene.
Aluminium on reacting with a strong alkali like sodium hydroxide with the presence of moisture gives sodium tetrahydroxoaluminate complex and liberates hydrogen gas.

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S seema garhwal
Orthoboric acid on heating gives metaboric acid with the removal of 4 molecules of water and on further heating, metaboric acid converts to tetraboric acid and later on Boron trioxide (boric anhydride)
 undergoes condensation polymerisation yields straight chain polymer and water molecule as a by-product. The final product is called silicone.  
When diborane reacts with the sodium hydride in the presence of ether, it gives sodium borohydride.
Elements of group 14 have 4 valance electrons. so the oxidation state of the group is +4 and +2. Due to the inert pair effect, the stability of +2 is more on moving down the group. So, the correct option is B
On treating diborane with water it gives orthoboric as the main product and liberates hydrogen gas.
An aqueous solution of borax is basic in nature. It is salt of a strong base () and weak acid () Option C is the correct answer.
Laboratory method of preparation of   and - Carbon dioxide can be prepared by treating calcium carbonate with dil. hydrochloric acid. Carbon monoxide can be prepared by the dehydration of methanoic acid(formic acid) with conc. sulphuric acid at 373K.  The commercial method of preparation of    and -  can be prepared by heating limestone.  can be prepared by passing steam over hot...
As per the given information, the compound X is a salt of a strong base and a weak acid because salt is alkaline to litmus. And when X is heated it swells to become Y. Thus, this must be borax because borax on heating, loses water molecule and swells to form sodium metaborate if we continue to heat it becomes glassy material Y. Hence Y should be a mixture of two compound boric anhydrides and...
Catenation- The same atoms of element link with another same atom via a strong covalent bond to form long chains or branches. This type of property is known as catenation. Carbon and silicon show this property.
Allotropy- The existence of an element in more than one form. The various forms of the same element are known as allotropes. They have the same chemical properties but different physical properties. For example- Carbon exists in three allotropic forms: diamond, fullerene and the graphite.

Allotropy is the existence of one element in more than one form. These have the same chemical properties but the different physical properties. The various forms of elements are called allotropes. As we know that carbon has three allotropes are named as:- Diamond, graphite and fullerene

 is a neutral Acidic oxides- Being acidic, the oxides react with bases to form a salt. So take base = sodium hydroxide ()  these compounds react with a base to form salts. ex.- sodium metaborate, sodium silicate and sodium carbonate respectively. Basic Oxides-  It reacts with an acid to form salts. let acid = hydrochloric acid (). for example thallium chloride. Amphoteric Oxides- These...
In given information, when X is treated with the sodium hydroxide it gives A(white ppt) and it is soluble in excess of . Thus X must be aluminium. So, the white ppt of A is aluminium hydroxide.  The complex B is soluble in excess of sodium hydroxide So it means it is a sodium tetrahydroxy aluminate(II) complex. Now, when we add dilute HCl to aluminium hydroxide it gives the compound C...
Thallium belongs to group 13 of the periodic table. It shows +3 and +1 oxidation state. Due to the inert pair effect, the stability of the +1 oxidation state is more, on moving down the group. We know that aluminium and alkali metals +3 and +1 oxidation states.  Thallium displays both oxidation states. Therefore it resembles both aluminium and alkali metals. Like , it also forms compounds such...