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Identify the pair of Lanthanoides with one strong oxidant and one strong reductant:
Aluminium chloride in acidified aqueous solution forms a complex 'A'. The formula of A and hybridisation state of Al in 'A' is respectively:
Which of the statements is not true?
$\text{HgCl}_2$ and $\text{I}_2$ both when dissolved in water containing $\text{I}^-$ ions, the pair of species formed is:
Which of the following statements are incorrect? A. All the transition metals except scandium form MO oxides which are ionic. B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in $Sc_2O_3$ to $Mn_2O_7$. C. Basic character increases from $V_2O_3$ to $V_2O_4$ to $V_2O_5$. D. $V_2O_4$ dissolves in acids to give $VO_4^{3-}$. E. CrO is basic, but $Cr_2O_3$ is amphoteric. Choose the correct answer from the options given below:
Which one of the following statements is correct when $\text{SO}_2$ is passed through acidified $\text{K}_2\text{Cr}_2\text{O}_7$ solution?
Which of the following statements is not correct about diborane?
Which of the following species is not stable?
The basic structural unit of silicates is:
Urea reacts with water to form A which will decompose to form B. B when passed through $Cu^{2+}(aq)$, deep blue colour solution C is formed. What is the formula of C from the following?
Match the Column-I with Column-II Column-I (a) P - wave (b) QRS complex (c) T - wave (d) Reduction in the size of T-wave Column-II (i) Depolarisation of ventricles (ii) Repolarisation of ventricles (iii) Coronary ischemia (iv) Depolarisation of atria (v) Repolarisation of atria
The number of moles of $MnO_4^-$ being reduced to $Mn^{2+}$ under acidic conditions by $4.517 \times 10^{24}$ electrons are:
Match Column-I with Column-II and mark the most appropriate option: **Column-I (Metal ion)** (A) $\text{Co}^{3+}$ (B) $\text{Cr}^{3+}$ (C) $\text{Fe}^{3+}$ (D) $\text{Ni}^{2+}$ **Column-II (Spin magnetic moment)** (i) $\sqrt{8}\text{ B.M.}$ (ii) $\sqrt{35}\text{ B.M.}$ (iii) $\sqrt{15}\text{ B.M.}$ (iv) $\sqrt{24}\text{ B.M.}$
The pair of lanthanoid ions, consisting of elements which are diamagnetic, is:
The pair of compounds that can exist together is:
Given below are two statements: Assertion (A): Ionisation enthalpies of early actinoids are lower than early lanthanoids. Reason (R): Electrons entering $5f$ orbitals in actinoids experience greater shielding from the nuclear charge. In the light of the above statements, choose the most appropriate answer from the options given below:
4NH₃ + 5O₂ → 6H₂O + 4NO When 1 mole of ammonia (NH₃) reacts with 1 mole of oxygen (O₂), which of the following outcomes occurs regarding the consumption of the reactants?
An incorrect statement among the following is :
It is because of the inability of $ns^2$ electrons of the valence shell to participate in bonding that:
The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence?