Which of the following properties describes the diagonal relationship between boron and silicon
`BCl_(3)` is not hydrolysed where as `SiCl_(4)` can be hydrolysed
Both form oxides; `B_(2)O_(3)` is amphoteric and `SiO_(2)` is acidic
Both dissolve in cold and dilute nitric acid
Borides and silicides are hydrolysed by water

From - SO_(2), SiO_(2), Al_(2)O_(3), MgO, CO, Na_(2)O - Select an oxide which dissolves in water forming an acid

When BCl_(3) is treated with water, it hydrolyses and forms [B[OH]_(4)]^(-) only whereas AlCl_(3) in acidified aqueous solution forms [Al[H_(2)O]_(6)]^(3+) ion. Explain what is the hybridisation of boron and aluminium in these species ?

Be and Al exhibit diagonal relationship. Which of the following statements about them is/are not true? (i) both react with HCl to liberate H_(2) . (ii) Theey are made passive by HNO_(3) . (iii) Their carbides give acetylene on treatment with water. (iv) Their oxides are amphoteric.

Find the structure of (A), C_(10)H_(10)O_(2) , a sweet-smelling liquid that has the following properties: It does not dissolve in NaOH or given a colour with FeCI_(3) , it adds one equivalent of H_(2) on catalytic hydrogenation. Reductive ozonolysis affords H_(2)C=O and C_(9)H_(8)O_(3) (B) that gives a positive Tollens test. Oxidation of (A) with KMnO_(4) gives an acid (C) (MW = 166) which gives no colour with FeCI_(3) . When (C) is refluxed with concentrated HI, H_(2)C=O and 3,4-dihydroxybenzoic acid are isolated and identified.

Identify the element (X) in each of the following (i) The reaction between metallic element(X) and water is quite slow. (ii) (X) is a reactive metal which forms three ionic oxides with composition. X_(2)O,XO_(2) and X_(2)O_(2) the perchlorate XClO_(4) is insoluble in water. (iii) (X) is the most abundant element in group 1. (iv) the chemistry of (X) resembles that of magnesium.

Write the balanced chemical equations for the following : (a) Pb_(3)O_(4) is treated with nitric acid. (b) Zinc oxide is treated with excess of sodium hydroxide solution. (c) Dilute nitric acid is slowly reacted with metallic tin. (d) Gold is dissolved in aqua regia. (e) Iron reacts with cold dilute nitric acid. (f) Sodium thiosulphate is added slowly to silver nitrate. (g) Heating of ZnCI_(2).2H_(2)O .

All the boron trihalides except BI_(3) may be prepared by direction between the elements. Boron trihalides consist of trigonal-planar BX_(3) molecules. Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and solid states, BF_(3) and BCl_(3) are gases, BBr_(3) is a volatile liquid and BI_(3) is a solid. Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction: BF_(3)(g)+NH_(3)(g)toF_(3)B-NH_(3)(s) However, boron chlorides, bromides and iodides are susceptible (sensitive) to protolysis by mild proton sources such as water, alcohols and even amines, for example BCl_(3) undergoes rapid hydrolysis: BCl_(3)(g)+3H_(2)O(l)toB(OH)_(3)(aq)+3HCl (aq) It is supposed that the first step in the above reaction is the formation of the complex Cl_(3)B larr OH_(2) which then eliminates HCl and reacts with water. Which of the follwoing is the best order of Lewis acid strength of BF_(3),BCl_(3) and BBr_(3) ?

All the boron trihalides except BI_(3) may be prepared by direction between the elements. Boron trihalides consist of trigonal-planar BX_(3) molecules. Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and solid states, BF_(3) and BCl_(3) are gases, BBr_(3) is a volatile liquid and BI_(3) is a solid. Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction: BF_(3)(g)+NH_(3)(g)toF_(3)B-NH_(3)(s) However, boron chlorides, bromides and iodides are susceptible (sensitive) to protolysis by mild proton sources such as water, alcohols and even amines, for example BCl_(3) undergoes rapid hydrolysis: BCl_(3)(g)+3H_(2)O(l)toB(OH)_(3)(aq)+3HCl (aq) It is supposed that the first step in the above reaction is the formation of the complex Cl_(3)B larr OH_(2) which then eliminates HCl and reacts with water. Which of the following is the correct prediction about observed B-X bond length, in BX_(3) molecules?

All the boron trihalides except BI_(3) may be prepared by direction between the elements. Boron trihalides consist of trigonal-planar BX_(3) molecules. Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and solid states, BF_(3) and BCl_(3) are gases, BBr_(3) is a volatile liquid and BI_(3) is a solid. Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction: BF_(3)(g)+NH_(3)(g)toF_(3)B-NH_(3)(s) However, boron chlorides, bromides and iodides are susceptible (sensitive) to protolysis by mild proton sources such as water, alcohols and even amines, for example BCl_(3) undergoes rapid hydrolysis: BCl_(3)(g)+3H_(2)O(l)toB(OH)_(3)(aq)+3HCl (aq) It is supposed that the first step in the above reaction is the formation of the complex Cl_(3)B larr OH_(2) which then eliminates HCl and reacts with water. Which of the following reactions is incorrect ?

Which of the following set is having correct statements here regarding both B and Al? 1. They react with HCl to form chlorides 2. Both boron and aluminium react with nitrogen. 3. They burn in oxygen to give oxides at high temperature 4. Their halides are Lewis acids