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प्रश्न
Why are pentahalides more covalent than trihalides?
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उत्तर
In pentahalides, the oxidation state is +5 and in trihalides, the oxidation state is +3. Since the metal ion with a high charge has more polarizing power, pentahalides are more covalent than trihalides.
संबंधित प्रश्न
Explain how does nitrogen exhibit anomalous behaviour amongst group 15 elements.
Discuss the trends in chemical reactivity of group 15 elements.
Why does R3P=O exist but R3N=O does not (R = alkyl group)?
Why does nitrogen show catenation properties less than phosphorus?
Among the hydrides of Group-15 elements, which have the maximum reducing character?
Account for the following
The enthalpy of atomisation is lowest for Zn in 3d series of the transition elements.
Account for the following :
Acidic character decreases from N2O3 to Bi2O3 in group 15.
Collectively the elements of group 15 are called:
Which one of the following elements is most metallic?
Which of the following has the highest pπ–pπ bonding tendency?
Which of the following is the strongest reducing agent?
Acidity of diprotic acid in aqueous solution increases in order.
The oxidation state of central atom in the anion of compound \[\ce{NaH2PO2}\] will be ______.
Which of the following options are not in accordance with the property mentioned against them?
| (i) | \[\ce{F2 > Cl2 > Br2 > I2}\] | Oxidising power. |
| (ii) | \[\ce{MI > MBr > MC1 > MF}\] | Ionic character of metal halide. |
| (iii) | \[\ce{F2 > Cl2 > Br2 > I2}\] | Bond dissociation enthalpy. |
| (iv) | \[\ce{HI < HBr < HCI < HF}\] | Hydrogen-halogen bond strength. |
Match the species given in Column I with the shape given in Column II and mark the correct option.
| Column I | Column II |
| (A) \[\ce{SF4}\] | (1) Tetrahedral |
| (B) \[\ce{BrF2}\] | (2) Pyramidal |
| (C) \[\ce{BrO^{-}3}\] | (3) Sea-saw shaped |
| (D) \[\ce{NH^{+}4}\] | (4) Bent T-shaped |
Assertion: N2 is less reactive than P4.
Reason: Nitrogen has more electron gain enthalpy than phosphorus.
Account for the following:
Zinc is a comparatively a soft metal, iron and chromium are typically hard.
The electronic configuration of Cu (atomic number 29) is
In NH3 and PH3 the common is:-
Which acid of the following pair would you expect to be stronger?
F−CH2−COOH or CH3−COOH
