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प्रश्न
Write the names of allotropic forms of selenium.
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उत्तर
Allotropes of Selenium: Red and grey selenium
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संबंधित प्रश्न
Select appropriate answers for the following.
BrCl reacts with water to form _______.
Select appropriate answers for the following.
Among the known interhalogen compounds, the maximum number of atoms is _______.
Give two uses of ClO2.
Answer the following.
What is the action of bromine on magnesium metal?
Complete the following.
l2 + KClO3 → _______ + KIO3
Complete the following.
BrCl + H2O → _______ + HCl
Complete the following.
\[\ce{XeF6 + 6H2O -> \underline{}\underline{}\underline{}\underline{} + HF}\]
Match the following:
| A | B |
| XeOF2 | Xenon trioxydifluoride |
| XeO2F2 | Xenon monooxydifluoride |
| XeO3F2 | Xenon dioxytetrafluoride |
| XeO2F4 | Xenon dioxydifluoride |
Answer the following.
Distinguish between rhombic sulfur and monoclinic sulfur.
Describe the manufacturing of H2SO4 by the contact process.
Write the order of ionic character of halides with monovalent metal (M).
Which one of the following ions has same number of unpaired electrons as those present in V3+ ion?
Which of the following halogens has the least affinity towards hydrogen?
Arrange the following in the increasing order of their acidic strength.
Which of the following oxyacid of chlorine is thermally least stable?
What is the oxidation state of sulphur in oil of vitriol?
Which halide of magnesium has highest ionic character?
Which among the following compounds does not act as reducing agent?
Among the trihalides of nitrogen which one is the most basic?
In which substance does nitrogen exhibit the lowest oxidation state?
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.
Arrange the halogen acids in the decreasing order of acidic strength.
What is the action of H2 on elements of group 17?
What is the action metal on elements of group 17?
Arrange the following in the increasing order of the property mentioned:
\[\ce{HOCl}\], \[\ce{HClO2}\], \[\ce{HClO3}\], \[\ce{HClO4}\] (acidic strength)
Arrange the following in the increasing order of the property mentioned:
\[\ce{HF}\], \[\ce{HCl}\], \[\ce{HBr}\], \[\ce{HI}\] (thermal stability)
