Orthoboric Acid

Q. 2. What is the difference between a polyhalide compound and interhalogen compound??

Q. What is the difference between iso-, tert- sec- in a organic compound

Q. Ques. Trisilyamine(SiH_3)_3N is : (a) trigonal pyramidal and acidic (b) trigonal pyramidal and basic (c) trigonal pyramidal and neutral (d) trigonal planar and weakly basi

Q. Boric acid is prepared from borax by the action of

1. HCl
2. NaOH
3. $C{O}_2$
4. $N{a}_{2}C{O}_3$

Q. Orthoboric acid when heated to red hot gives:

1. Metaboric acid
2. Pyroboric acid
3. Boron and water
4. Boric oxide

Q.

Answer the following question:

A catalyst used in manufacture of nitric acid by Ostwald s process.

Q.

$H_{3}B{O}_3$ is

1. Monobasic and weak Brosted acid

2. Monobasic and weak Lewis acid

3. Monobasic and strong Lewis acid

4. Tribasic and weak Bronsted acid

Q. When orthoboric acid $\left(H_{3}B{O}_3\right)$ is heated, the residue is:

1. Boron
2. Diborane
3. Boric anhydride
4. Borax

Q. 49. Which of the following form peroxide A)Bao2 B)Ko2 C)Mno2 D)No2 1)324 2)400 3)373 4)1024

Q. the compound possessing maximum covalent character among the following is (1) LiCl (2) NaCl (3) CsCl (4) KCl

Q. 48.The correct sequence of increasing covalent chararcter is represented by 1)LiCl < NaCl < BeCl2 2)BeCl2 < LiCl < NaCl 3)NaCl < LiCl < BeCl 4)BeCl < NaCl

Q. A mixture of boric acid with ethyl alcohol burns with a green flame due to the formation of:

1. Ethyl borax
2. Ethyl borate
3. Methyl borax
4. Methyl borate

Q. 43. Cl, reacts with ammonia in excess to form a gaseous product A & another compound B, whichheating with caustic soda gives another gaseous productThe hybridisation of central atom in C &shape of C" are respectively1) sp, linear2) sp trigonal planar 3) sp3, pyramidal4) sptetrahedra

Q.

$B(OH{)}_3+NaOH\rightleftharpoons NaB{O}_2+Na[B(OH{)}_4{]}^{-}+H_{2}O$

How can the reaction above be made to proceed in the forward reaction?

1. Addition of cis-1, 2-diol

2. Addition of borax

3. Addition of trans-1, 2-diol

4. Addition of $N{a}_{2}HP{O}_4$

Q. Boric acid is polymeric due to

1. it acidic nature
2. the presence of hydrogen bonds
3. it monobasic nature
4. it geometry

Q. 4.In the following reaction using hydrogen peroxide (H2O2) where O has mass 18(isotopic form)- MnO4- +5 H2O2 (18) +6H+ --->2Mn2+ +8H2O +5O2 O(18) is present in: 1-H2O 2-O2 3-both 4-None

Q. On addition of catechol to aqueous solution of boric acid, it will :

1. increase the pH of solution
2. decrease the pH of the solution
3. form polymeric metaborate species
4. leave the solution undisturbed.

Q. Compare the covalent character of (1) NaF, NaCl, NaBr, NaI. (2) NaCl, MgCl2, AlCl3.

Q.

Sulphuric acid is a ____ acid

Q. With cold and dilute sodium sodium hydroxide fluorine reacts to give :

1. $NaF$ and $O{F}_2$
2. $NaF+O_3$
3. $O_2$ and $O_3$
4. $NaF+O_2$

Q. what is diff b/w hypervalent or e- rich hydrides ?/

Q. Which of the following will not increase the acidic nature of $B(OH{)}_3$?

1. Glycerol
2. Mannitol
3. Ethanol
4. Both (a) and (b)

Q. A sample of Fe_xO contains one Fe(IIl) for every threeFe(Il), then the value of x is

Q. Which is true in case of boric acid $\left(H_{3}B{O}_3\right)$ ?

1. It is a white crystalline solid
2. It is sparingly soluble in water
3. It is highly soluble in hot water
4. All of the above.

Q. Which of the following have highest latticeenthalpy?(1) Al, O(3) AIF(2) AUN(4) AICI,

Q.

Which one of the following statements about $H_{3}B{O}_3$ is not correct ?

1. It is a tribasic acid

2. It is prepared by acidifying an aqueous solution of borax

3. It has a layer structure in which planar $B{O}_3$ units are joined by hydrogen bonds

4. It does not act as proton donor as it acts as a Lewis acid by accepting hydroxyl ion