MCQ
Formula of Rust is
- A$Fe_2O_3$
- B$FeO.xH_2O$
- ✓$Fe_2O_3.xH_2O$
- D$Fe_3O_4.xH_2O$
✓
Answer
Correct option: C.
$Fe_2O_3.xH_2O$
c
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
Which of the following expressions gives the de-Broglie relationship
Which will increase the voltage of the cell $S{n_{(s)}} + 2A{g^ + }_{(aq)} \to S{n^{2 + }}_{(aq)} + 2A{g_{(s)}}$
→The quantum number of four electrons are given below
→$I. n = 4,l = 2,m_l = -2, m_s = -1/ 2$
$II. n = 3,l = 2, m_l = 1,m_s = +1/ 2$
$III. n = 4,l = 1, m_l = 0, m_s = +1/ 2$
$IV. n = 3,l = 1, m_l = 1; m_s = -1/ 2$
The correct order of their increasing energies will be
A binary liquid solution is prepared by mixing $n-$ heptaneand ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?
→In nucleophilic aliphatic substitution, the nucleophiles are generally
For the reaction $A + B \to $products, doubling the concentration of $A$ the rate of the reaction is doubled, but on doubling the concentration of $B$ rate remains unaltered. The over all order of the reaction is
→Which of the following will be most readily dehydrated in acidic conditions
The sulphate of a metal $M$ contains $9.87\%$ of $M$. This sulphate is isomorphous with $ZnS{O_4}.7{H_2}O$. The atomic weight of $M$ is
→At $298\, \mathrm{~K}$, the enthalpy of fusion of a solid $(\mathrm{X})$ is $2.8 \,\mathrm{k} \mathrm{J}\, \mathrm{mol}^{-1}$ and the enthalpy of vaporisation of the liquid $(X)$ is $98.2 \,\mathrm{~kJ}\, \mathrm{~mol}^{-1}$. The enthalpy of sublimation of the substance $(\mathrm{X})$ in $\mathrm{kJ} \,\mathrm{mol}^{-1}$ is $.....$ (in nearest integer)
→The given graph is a representation of kinetics of a reaction.
→$[Image]$
The $y$ and $x$ axes for zero and first order reactions, respectively are