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प्रश्न
The element that does NOT exhibit allotropy is
- As
- Sb
- Bi
- N
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उत्तर
(c) Bi
With the exception of Bismuth, all other elements exhibit allotropy.
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संबंधित प्रश्न
Write four points of differences between properties of nitrogen and other elements of group 15.
Explain how does nitrogen exhibit anomalous behaviour amongst group 15 elements.
Nitrogen does not form pentahalide.
Account for the following: Reducing character increases from NH3 to BiH3.
Give reasons for the following : (CH3)3 P = O exists but (CH3)3 N = O does not.
Why are pentahalides more covalent than trihalides?
Why does R3P=O exist but R3N=O does not (R = alkyl group)?
Among the hydrides of Group-15 elements, which have the lowest boiling point?
Among the hydrides of Group-15 elements, which have the highest bond angle?
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.
What is the action of sodium on arsenic.
What is the action of Magnesium on bismuth.
Elements having +5 oxidation state is ____________.
In which of the following compound, nitrogen shows the oxidation state of +5?
The element which forms oxides in all oxidation states varying from +1 to +5 is ____________.
H2S is more acidic than H2O because ____________.
Among the following, which one is a wrong statement.
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 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. |
In \[\ce{PCl5}\], phosphorus is in sp3d hybridised state but all its five bonds are not equivalent. Justify your answer with reason.
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.
Among the following, identify the species with an atom in +6 oxidation state.
The elements with zero electron affinity are
Basicity of ortho phosphoric acid is:-
The basic strengths of the hydrides group is elements decrease in the order.
When a colourless gas is passed through bromine water it decolorise, The gas is:-
The element With maximum ionisation potential is
The decreasing order of the boiling points of the following hydrides is ______.
