Advertisements
Advertisements
प्रश्न
Write the names of allotropic forms of selenium.
Advertisements
उत्तर
Allotropes of Selenium: Red and grey selenium
APPEARS IN
संबंधित प्रश्न
Select appropriate answers for the following.
Stability of interhalogen compounds follows the order _______.
Select appropriate answers for the following.
In which of the following pairs, molecules are paired with their correct shapes?
Select appropriate answers for the following.
Among the known interhalogen compounds, the maximum number of atoms is _______.
Answer the following.
Write the order of the thermal stability of the hydrides of group 16 elements.
Complete the following.
BrCl + H2O → _______ + HCl
Complete the following.
\[\ce{XeF4 + SiO2 -> {..........} + SiF4}\]
Complete the following.
\[\ce{XeF6 + 6H2O -> \underline{}\underline{}\underline{}\underline{} + HF}\]
Complete the following.
\[\ce{XeOF4 + H2O -> \underline{}\underline{}\underline{}\underline{} + HF}\]
Match the following:
| A | B |
| XeOF2 | Xenon trioxydifluoride |
| XeO2F2 | Xenon monooxydifluoride |
| XeO3F2 | Xenon dioxytetrafluoride |
| XeO2F4 | Xenon dioxydifluoride |
Fluorine shows only –1 oxidation state while other halogens show –1, +1, +3, +5 and +7 oxidation states. Explain.
Describe the manufacturing of H2SO4 by the contact process.
Acidic strength of halogen acids increases in the order of _______.
The halide that undergoes sp3d hybridisation is ____________.
Identify the properties of group 17 elements that show decreasing trend down the group.
i. Atomic radius
ii. Ionisation enthalpy
iii. Electronegativity
Which of the following halogens has the least affinity towards hydrogen?
Which of the following is INCORRECT with respect to given reaction?
\[\ce{C6H12O6 + 6O2 -> 6CO2 + 6H2O}\]
What is the highest oxidation state possessed by phosphorus in it's oxyacids?
The oxidation state of sulphur in H2S2O7 is ______.
The oxidation state of halogen atom in perhalic acid and hypohalous acid are respectively ____________.
Which is the lowest oxidation state possessed by chlorine in it's oxyacids?
Which among the following compounds does not act as reducing agent?
What is the oxidation number of gold in the complex [AuCl4]1−?
Consider the following reaction.
I. \[\ce{Na2B4O7 ->[760° C] {...A...} + B2O3}\]
II. \[\ce{Si + KOH + H2O ->{...B...} + H2\uparrow}\]
III. \[\ce{P2O5 + HNO3 -> HPO3 + {...C...}}\]
IV. \[\ce{NH3 + Cl2(excess) -> {...D...} + HCl}\]
Identify the missing products of the given reactions.
Give two reactions showing oxidising property of concentrated H2SO4. Write the structures of HClO3 and HClO4.
What are the allotropes of oxygen?
What is the action of hydrochloric acid on the following?
Na2CO3
Arrange the following in the increasing order of the property mentioned:
\[\ce{HOCl}\], \[\ce{HClO2}\], \[\ce{HClO3}\], \[\ce{HClO4}\] (acidic strength)
