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प्रश्न
The element that does NOT exhibit allotropy is
- As
- Sb
- Bi
- N
उत्तर
(c) Bi
With the exception of Bismuth, all other elements exhibit allotropy.
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संबंधित प्रश्न
Arrange the following in the increasing order of property mentioned :
H3PO3, H3PO4, H3PO2 (Reducing character)
Give reasons for the following : (CH3)3 P = O exists but (CH3)3 N = O does not.
Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.
Why does R3P=O exist but R3N=O does not (R = alkyl group)?
Arrange the following in the increasing order of property mentioned :
NH3, PH3, AsH3, SbH3, BiH3 (Base strength)
Among the hydrides of Group-15 elements, which have the maximum basic character?
Account for the following :
BiH3 is the strongest reducing agent amongst all the hydrides of group 15.
Write the structural difference between white phosphorus and red phosphorus.
Maximum covalency of nitrogen is ______.
The strongest oxidising agent is ____________.
The correct order of solubility in water for He, Ne, Ar, Kr, Xe is:
The element which forms oxides in all oxidation states varying from +1 to +5 is ____________.
Ionic radii (in Å) of As3+, Sb3+ and Bi3+ follow the order:
Which of the following group 15 elements forms metallic bonds in an elemental state?
Which of the following has the highest pπ–pπ bonding tendency?
The correct order of increasing oxidising power is:
Acidity of diprotic acid in aqueous solution increases in order.
Which of the following statements is true?
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. |
Which of the following orders are correct as per the properties mentioned against each?
| (i) | \[\ce{As2O3 < SiO2 < P2O3 < SO2}\] | Acid strength. |
| (ii) | \[\ce{AsH3 < PH3 < NH3}\] | Enthalpy of vapourisation. |
| (iii) | \[\ce{S < O < Cl < F}\] | More negative electron gain enthalpy. |
| (iv) | \[\ce{H2O > H2S > H2Se > H2Te}\] | Thermal stability. |
The enthalpy change of a reaction does not depends upon?
Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion: Smaller the size of an atom greater is the electronegativity.
Reason: Electronegativity refers to the tendency of atom to share electrons with other atom.
In a regular octahedral molecule mx6, the number of X – M – X bouds at 180° are:-
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In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?
Which acid of the following pair would you expect to be stronger?
F−CH2−COOH or CH3−COOH
