Advertisements
Advertisements
Question
Answer the following.
Write the names of allotropic forms of selenium.
Solution
Allotropes of Selenium: Red and grey selenium
APPEARS IN
RELATED QUESTIONS
Select appropriate answers for the following.
Chlorine reacts with excess of fluorine to form _______.
Select appropriate answers for the following.
Which of the following has one lone pair of electrons?
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.
Answer the following.
What is the oxidation state of Te in TeO3?
Answer the following.
The pKa value of HCl is - 7.0 and that of HI is -10.0. Which is the stronger acid?
Complete the following.
Cl2 + ClF3 → _______
Complete the following.
H2C = CH2 + ICl → _______
What is the oxidation state of xenon in the following compounds?
XeOF4, XeO3, XeF6, XeF4, XeF2.
Answer the following.
Give two reactions showing the oxidising property of concentrated H2SO4.
Fluorine shows only –1 oxidation state while other halogens show –1, +1, +3, +5 and +7 oxidation states. Explain.
Identify the properties of group 17 elements that show decreasing trend down the group.
i. Atomic radius
ii. Ionisation enthalpy
iii. Electronegativity
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 of the following oxyacid of chlorine has highest thermal stability?
Which is the lowest oxidation state possessed by chlorine in it's oxyacids?
The maximum positive oxidation state shown by halogen is ______.
What is the action of selenium on magnesium metal?
What is the highest oxidation state exhibited by group 17 elements?
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.
Arrange the halogen acids in the decreasing order of acidic strength.
Explain reactivity of halogens towards oxygen.
Give two reactions in which acidified K2Cr2O7 is used as an oxidizing agent.
Arrange the following in the increasing order of the property mentioned:
\[\ce{HF}\], \[\ce{HCl}\], \[\ce{HBr}\], \[\ce{HI}\] (thermal stability)