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Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
Held on 30 Apr 2003 · Verified 6 Jul 2026.
is an allotropic form of diamond
has molecules of variable molecular masses like polymers
has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
is a non-crystalline substance
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By usual analysis, 1.00 g of compound $(\mathrm{X})$ gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound $(X)$ is : (nearest integer) (Given, molar mass in $\mathrm{g} \mathrm{mol}^{-1}: \mathrm{O}=16, \mathrm{Mg}=24, \mathrm{P}=31$)
Among $Fe^{2+}, Fe^{3+}, Cr^{2+}$ and $Zn^{2+}$, the ion that shows positive borax bead test and with highest ionisation enthalpy is:
Consider three metal chlorides $\mathrm{x}, \mathrm{y}$ and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. $\mathrm{x}, \mathrm{y}$ and z are respectively
Among $Fe^{3+}$, $Pb^{2+}$, $Cu^{2+}$ and $Mn^{2+}$, identify the one that gets precipitated out while passing $H_2S$ in presence of $NH_4OH$ as group reagent. The highest possible oxidation state of the corresponding metal is
Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ? A. $[\text{NiCl}_4]^{2-}$ $-$ sp$^3$, tetrahedral, paramagnetic B. $[\text{Ni(NH}_3)_6]^{2+}$ $-$ sp$^3$d$^2$, octahedral, paramagnetic C. $[\text{Ni(CO)}_4]$ $-$ sp$^3$, tetrahedral, paramagnetic D. $[\text{Ni(CN)}_4]^{2-}$ $-$ dsp$^2$, square planar, diamagnetic Choose the correct answer from the options given below :
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