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Dihalides of group 16 elements undergo ____________.
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The first ionization enthalpies of alkali metals decreases down the group because of
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In the following reaction, the oxidation number of Cr changes.
\[\ce{ClO^-_{( aq)} + Cr(OH)^-_{4(aq)} -> CrO^{2-}_{4(aq)} + Cl^-_{( aq)} (basic)}\]
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Which of the following statements is INCORRECT?
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Which of the following is a hydrogen bonded molecular solid?
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Identify the strongest oxidising agent.
\[\ce{Na^+ + e^- -> Na}\]; E0 = −2.714 V
\[\ce{Pt^{2+} + 2e^- -> Pt}\]; E0 = +1.200 V
\[\ce{I2 + 2e^- -> 2I^-}\]; E0 = + 0.535 V
\[\ce{Co^{2+} + 2e^- -> Co}\]; 0 = −0.280 V
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The oxidation number of sulphur in S8 molecule is ______.
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Match the following.
| Compound | Oxidation no. of underlined element |
| i. \[\ce{\underline{C}_4H4O^{2-}_6}\] | a. +2.5 |
| ii. \[\ce{\underline{N}_3H}\] | b. +1.5 |
| iii. \[\ce{Mg2\underline{P}_2O7}\] | c. +5 |
| iv. \[\ce{Na2\underline{S}_4O6}\] | d. `-1//3` |
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Which of the following is a natural polymer?
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The monomers used in the preparation of dextron are ______.
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Calcite and ____________ are two forms of calcium carbonate.
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If \[\ce{C(s) + O2(g) -> CO2(g), \Delta H = - \text{x}}\]
\[\ce{CO(g) + \frac{1}{2} O2(g) -> CO2(g), \Delta H = - \text{y}}\],
Calculate Δf H for CO(g) formation.
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Which among the following compounds is obtained when ethane nitrile is acid hydrolysed?
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For the reaction \[\ce{A + 2B -> C}\], the instantaneous rate of reaction at a given instant can be represented by ____________.
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Which of the following is CORRECT for the atomic and ionic radii of alkali metals?
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In which of the following, oxidation number of oxygen is +2?
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Sea water is a homogeneous mixture of ____________ type of solution.
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Which of the following molecules have London forces as predominant intermolecular force of attraction?
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The following structure can be represented as:
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In which of the following, the central atom does NOT have lone pair(s) of electrons?
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