MCQ
The correct formula of borax is
- A$Na_2[B_4O_4(OH)_3].9 H_2O$
- ✓$Na_2[B_4O_5(OH)_4].8 H_2O$
- C$Na_2[B_4O_6(OH)_5].7 H_2O$
- D$Na_2[B_4O_7(OH)_6].6 H_2O$
✓
Answer
Correct option: B.
$Na_2[B_4O_5(OH)_4].8 H_2O$
b
Borax is sodium tetraborate decahydrate i.e. $Na_2[B_4O_5(OH)_4].8H_2O$
Borax is sodium tetraborate decahydrate i.e. $Na_2[B_4O_5(OH)_4].8H_2O$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The alkene that exhibits geometrical isomerism is :
Nitrogen is obtained when $NaN{O_2}$ reacts with
→Arrange these compounds in decreasing order of reactivity for the nucleophilic addition reaction :
→$(I)$ Acid chloride $(II)$ Aldehyde
$(III)$ Ketone $(IV)$ Ester
Select the correct answer from the codes given below :
A sample of $N{a_2}C{O_3}.{H_2}O$ weighing $0.62\,\,g$ is added to $100\,\,ml$ of $0.1\,N\;\;{(N{H_4})_2}S{O_4}$ solution. What will be the resulting solution
→Equilibrium constant $(K_c)$ of $2HI_{(g)} \rightleftharpoons H_{2(g)} + I_{2(g)}$ is $5\times10^3$. What is the equilibrium concentration of $HI$, if equilibrium concentrations of $H_{2(g)}$ and $I_{2(g)}$ respectively are $2.2\times10^{-2}\, M$ and $2.2\times10^{-4}\, M$ ?
→The enthalpy changes for the following processes are listedbelow :
→| $Cl_2(g) \rightarrow 2Cl(g),$ | $242.3\,kJ\,mol^{-1}$ |
| $I_2(g) \rightarrow 2I(g),$ | $151.0\,kJ\,mol^{-1}$ |
| $ICl(g) \rightarrow I(g)+Cl(g),$ | $211.3\,kJ\,mol^{-1}$ |
| $I_2(s) \rightarrow I_2(g),$ | $62.76\,kJ\,mol^{-1}$ |
Given that the standard states for iodine and chlorine are $I_2(s)$ and $Cl_2(g),$ the standard enthalpy of formation for $ICl(g)$ is : ............... $\mathrm{kJ\,mol}^{-1}$
Optical activity of an enantiomeric mixture is $+12.6^{\circ}$ and the specific rotation of $(t)$ isomer is $+30^{\circ}$. The optical purity is $........\%$
→If an iron rod is dipped in $CuS{O_4}$ solution
→Assertion : $C -O$ bond in metal carbonyls is long.
→Reason : There is delocalisation of electrons from filled $d$ orbitals into the empty orbitals on the $CO$ ligands.
The weight percentage of hydrogen in $Q$, formed in the following reaction sequence, is. . . .
→[Given : Atomic mass of $H =1, C =12, N =14, O =16, S =32, Cl =35$ ]