Arrange the following in order of property indicated for each set : H 2 O H 2 S H 2 Se H 2 Te – increasing acidic character

H 2 O < H 2 S < H 2 Se < H 2 Te This is because the H - E bond length increases down the group, hence the bond dissociation enthalpy decreases down the group. Due to the decreasing bond dissociation enthalpy, acidic character of group 16 elements increases down the group.

Write balanced chemical equations for the following process : MnO 2 is heated with conc. HCl .

When MnO 2 is heated with conc. HCl , it forms chlorine Gas ( Cl 2 ) , Manganese ( II ) Chloride ( MnCl 2 ) and Water ( H 2 O ) is obtained when Manganese ( IV ) Oxide reacts with conc. HCl . 4 HCl + MnO 2 ⟶ Cl 2 + MnCl 2 + 2 H 2 O

Write balanced chemical equations for the following process : XeF 2 undergoes hydrolysis.

Xenon difluoride reacts with water to form Xenon, hydrogen fluoride and oxygen. Here is the balanced chemical equation when XeF 2 undergoes hydrolysis,

Complete the following chemical reactions: I - aq + H + aq + O 2 g →

Iodine is a halogen belonging to the Group 17 of the Periodic table. The ready acceptance of an electron is the reason for the strong oxidising nature of halogens. The relative oxidising power of halogens can further be illustrated by their reactions with water. I - can be oxidised by oxygen in an acidic medium. According to the given reaction, iodine ion is oxidised by oxygen in acid medium to form water and iodine molecule. 4 I - aq + 4 H + aq + O 2 g → 2 I 2 ( s ) + 2 H 2 O l

Complete the following chemical reactions: XeF 6 + KF →

Xenon Xe is a noble gas element belonging to the Group 18 of the periodic table. Xenon forms compounds mainly with most electronegative elements like fluorine and oxygen. Xenon fluorides react with fluoride ion donors to form fluoroanions. The reaction is as follows: XeF 6 + KF → K + XeF 7 +

Draw the shape of the following molecule: BrF 3

BrF 3 has square pyramidal geometry. Its structure is: Here, the Br atom has 5 electron pairs in its valence shell. In that, there are three bond pairs and two lone pairs. Therefore, the shape of the molecule is a Bent T-shaped molecule.

Draw the shape of the following molecule: XeOF 4

XeOF 4 has square pyramidal geometry. Its structure is: The central atom(Xe) has one lone pair of electrons and five bonding domains as shown in the above fig. and it undergoes sp 3 d 2 hybridisation.

Complete the following chemical reactions: MnO 2 + 4 HCl →

The given reaction is used for the preparation of chlorine which is a halogen of Group 17 in the periodic table. In this reaction, manganese dioxide is heated with concentrated hydrochloric acid to form chlorine. This is a redox reaction in which, 1 mol manganese dioxide reacts with 4 mol hydrochloric acid to produce 1 mol manganese chloride, 1 mol chloride, and 2 mol water based on stoichiometry. MnO 2 + 4 HCl → MnCl 2 + Cl 2 + 2 H 2 O

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter -1 - The p-Block Elements>CBSE-2018>Q 7

EASY

12th CBSE

IMPORTANT

Earn 100

Draw the structures of the following: ${XeF}_{4}$ .

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