Borax

Q.

How to complete this reaction?

${\mathrm{HNO}}_3+{\mathrm{H}}_2\mathrm{O}$?

Q.

The basicity of Sulphurous acid $\left({\mathrm{H}}_2{\mathrm{SO}}_3\right)$is________ ?

Q.

Is ${\mathrm{HNO}}_3$a base or acid?

Q. Diborane is an molecule.

1. electron rich
2. electron precise
3. electron deficient

Q. The nature of aqueous solution of borax is:

1. Neutral
2. Acidic
3. Amphoteric
4. Basic

Q. When borax is dissolved in water:

1. $B(OH{)}_3$ is formed only
2. $\left[B\right(OH{)}_4{]}^{-}$ formed only
3. Both $B(OH{)}_3$ and $\left[B\right(OH{)}_4{]}^{-}$ are formed
4. $\left[B_3{O}_3\right(OH{)}_3{]}^{-}$ is formed only

Q.

Borax is actually made of two tetrahedra and two triangular units joined together and should be written as: Na2[B4O5(OH)4]·8H2O

The correct statement/s about borax is/are:

a. Each boron atom has four B-O bonds

b. Each boron atom has three B-O bonds

c. Two boron atoms have four B-O bonds while other two have three B-O bonds

d. Each boron atom has one -OH groups

1. b

2. c

3. d

4. a

Q. Match the Column-I with Column-II. Choose the correct option among the following
Column – I Column – II
(A) Borax (p) $s{p}^3$ hybridization of B
(B) $B{F}_3$ (q) $s{p}^2$ hybridization of B
(C) Diborane (r) Triangular unit
(D) Boric acid (s) Tetrahedral unit

1. A-(p, q, r, s), B-(q, r), C-(p, s), D-(q, r)
   
2. A-(r, s), B-(p, q), C-(p, q, r, s), D-(s)
   )
3. (r, s), B-(p, q), C-(s), D-(p, r)
4. A-(p, q, ), B-(q, r), C-(p, s), D-(q, r)
   

Q.

Borax is converted into crystalline boron by the following steps.

$Borax\stackrel{x}{⟶}{H}_{3}B{O}_3\stackrel{Heat}{⟶}{B}_2{O}_3\stackrel{y}{\underset{Heat}{⟶}}B$
X & Y are respectively

1. $H_{2}S{O}_4,Al$

2. $H_{2}S{O}_4,C$

3. $HCl,Mg$

4. $C,HCl$

Q.

$C{a}_2{B}_6{O}_{11}+N{a}_{2}C{O}_3\stackrel{Fused}{\to }\left(A\right)+\left(B\right)+CaC{O}_3\left(A\right)+C{O}_2\to \left(B\right)+N{a}_{2}C{O}_3\text{Solution}\left(B\right)+Conc.HCI\to NaCI+Acid\downarrow H_{2}O\left(C\right)\underset{heated}{\overset{Strongly}{\to }}\left(D\right)\text{Acid}\left(C\right)\left(D\right)+CuS{O}_4\underset{inflame}{\overset{Heated}{\to }}\text{Blue coloured}\left(E\right)\text{compound}\text{compound (E) is -}$

1. $C{u}_{2}O$

2. $CuS$

3. $CuS{O}_3$

4. $Cu(B{O}_2{)}_2$

Q.

Borax is converted into crystalline boron by the following steps.

$Borax\stackrel{x}{⟶}{H}_{3}B{O}_3\stackrel{Heat}{⟶}{B}_2{O}_3\stackrel{y}{\underset{Heat}{⟶}}B$
X & Y are respectively

1. $H_{2}S{O}_4,Al$

2. $H_{2}S{O}_4,C$

3. $HCl,Mg$

4. $C,HCl$

Q.

$C{a}_2{B}_6{O}_{11}+N{a}_{2}C{O}_3\stackrel{Fused}{\to }\left(A\right)+\left(B\right)+CaC{O}_3\left(A\right)+C{O}_2\to \left(B\right)+N{a}_{2}C{O}_3\text{Solution}\left(B\right)+Conc.HCI\to NaCI+Acid\downarrow H_{2}O\left(C\right)\underset{heated}{\overset{Strongly}{\to }}\left(D\right)\text{Acid}\left(C\right)\left(D\right)+CuS{O}_4\underset{inflame}{\overset{Heated}{\to }}\text{Blue coloured}\left(E\right)\text{compound}\text{compound (E) is -}$

1. $C{u}_{2}O$

2. $CuS{O}_3$

3. $CuS$

4. $Cu(B{O}_2{)}_2$

Q. Which of the following salt is used in borax bead test?

Q. The nature of aqueous solution of borax is:

1. Acidic
2. Neutral
3. Amphoteric
4. Basic

Q.

_____ gas dissolved in water to form an alkaline solution.$(N{H}_3/H_{2}S{O}_4/HCl)$

Q. Choose the products formed by action of $N{a}_{2}C{O}_3\text{on}{H}_{3}B{O}_3$

1. $N{a}_2{B}_4{O}_7,C{O}_2\text{and}{H}_{2}O$
2. $N{a}_2{B}_4{O}_7,C{O}_2\text{and}C$
3. $N{a}_2{B}_4{O}_7,O_2\text{and}CO$
4. $N{a}_2{B}_4{O}_7,C{O}_2\text{and}{O}_2$

Q. Which of the following compounds is formed in borax bead test?

1. Metaborate
2. Tetraborate
3. Triborate
4. Orthoborate

Q. The nature of aqueous solution of borax is:

1. Acidic
2. Neutral
3. Amphoteric
4. Basic

Q. Which of the following is/are use(s) of borax?

1. Preparation of buffer solutions
2. Qualitative analysis of metals
3. Antiseptic
4. Cleaning skins and hides

Q. The mineral colemanite is finely powdered and boiled with sodium carbonate solution. The precipitate of $CaC{O}_3$ and other two products X and Y are formed. On passing a current of $C{O}_2,Y$ produces X. Find X and Y.

1. $N{a}_2{B}_4{O}_7$
2. $NaB{O}_2$
3. $B_2{O}_3$
4. $CaC{O}_3$

Q. Match the following forms of borax with the number of water molecule(s) present as water of crystallisation.

1. 10
2. 5
3. \N

Q. Borax is used as a cleansing agent because when it is dissolved in water it gives a/an:

1. Alkaline solution
2. Acidic solution
3. Bleaching solution
4. Colloidal solution

Q. The correct statements regarding borax is/are :

1. White crystalline solid
2. More soluble in cold water
3. Less soluble in hot water
4. More soluble in hot water

Q. An aqueous solution of borax that has $1\text{mol}$ of borax reacts with $2\text{mol}$ of acids. This is because of the formation of:

1. 2 mol of $Ba(OH{)}_3$
2. 2 mol of ${\left[Ba\right(OH{)}_4]}^{-}$ only
3. 1 mol each of $B(OH{)}_3$ and ${\left[B\right(OH{)}_4]}^{-}$
4. 2 mol each of ${\left[B\right(OH{)}_4]}^{-}$ and $B(OH{)}_3$, of which only ${\left[B\right(OH{)}_4]}^{-}$ reacts with acid

Q. Borax bead test is used to identify the:

1. Anion in metal salt
2. Cation in metal salt
3. Salt
4. Metalloid

Q. On acidification of aqueous borax solution, it gives white flakes. This is due to formation of

1. $B(OH{)}_3$
2. $B_2{O}_3$
3. $B_2{H}_6$
4. $NaB{O}_2$

Q. Borax is written as:

1. $N{a}_2\left[B_4{O}_5\right(OH{)}_4].8H_{2}O$
2. $N{a}_2\left[B_4\right(OH{)}_7{O}_2].3H_{2}O$
3. $N{a}_{2}O{B}_4{O}_8{H}_2$
4. $N{a}_2{B}_4{O}_{1}7H_{2}O$

Q. Borax is written as:

1. $N{a}_2\left[B_4{O}_5\right(OH{)}_4].8H_{2}O$
2. $N{a}_2\left[B_4\right(OH{)}_7{O}_2].3H_{2}O$
3. $N{a}_{2}O{B}_4{O}_8{H}_2$
4. $N{a}_2{B}_4{O}_{1}7H_{2}O$

Q. Choose the product(s) formed by action of $N{a}_{2}C{O}_3$ and $H_{3}B{O}_3$

1. $N{a}_2{B}_4{O}_7$
2. $CO$
3. $C{O}_2$
4. $H_{2}O$

Q. Which of the following cations cannot give borax bead test?

1. $C{r}^{3+}$
2. $C{o}^{2+}$
3. $M{n}^{2+}$
4. $A{g}^{+}$