Q: Which one of the following is correct order of given isotopes? I. T_2>D_2>P_2 (order of boiling point) II. T_2>D_2>P_2 (order of bond energy) III. T_2=D_2=P_2 (order of bond length) IV. T_2 < D_2 < P_

Protium (P), deuterium (D) and tritium (T) are the three isotopes of hydrogen. These isotopes follow the order in different contexts as shown below : T_2>D_2>P_2 [Order of boiling point (BP)] T_2>D_2>P_2 [Order of bond energy .( BE ) ] T_2=D_2=P_2 [Order of bond length .( BL ) ] T_2 < D_2 < P_2 [Order of reactivity with Cl _2 ] Hence, all the given order are correct.

Q: ortho and para form of hydrogen have

Ortho and para hydrogen similar to each other in their chemical properties but they have different physical properties like boiling point, thermal conductivity, due to their difference in overall spins.

Q: The structure of H _2 O _2 is

Hydrogen peroxide ( H _2 O _2 ) is a non-planar molecule with twisted symmetrical structure. It has non-linear structure with an open book structure.

Q: Which one of the following statements in relation to the hydrogen atom is correct?

The hydrogen atom has the configuration 1 s and 3 s, 3 p and 3 d-orbitals will have same energy with respect to 1 s-orbital.

Question 1

Among the following the correct statements are I. LiH , BeH _2 and MgH _2 are saline hydrides with significant covalent character II. Saline hydrides are volatile III. Electron - precise hydrides are

Accepted Answer

Saline hydrides are not volatile as the strong ionic bonds keep the constituent ions together. Thus, statement II is incorrect. Electron-precise hydrides like CH _4, SiH _4, act as pH - neutral species. Thus, statement 3 is incorrect.

Question 2

In which of the following reactions of H _2 O _2 acts as an oxidising agent (either in acidic, alkaline or neutral medium)? (i) 2 Fe ^ 2+ + H _2 O _2 ^ (ii) 2 MnO _4^ - +6 H ^ + +5 H _2 O _2 (iii) I _

Accepted Answer

Let us complete the reactions: In reactions, (i) and (i v) H _2 O _2, acts as oxidising agent and itself gets reduced to H _2 O ,

Question 3

The strongest reducing agent among the following is:

Accepted Answer

The stability of hydrides decreases from NH _3 to BiH _3 but their reducing character increases down the group.

Question 4

Which of the following can be used to prevent the decomposition of H _2 O _2 ?

Accepted Answer

Urea acts as stablising agent. It prevents the decomposition of H _2 O _2.

Question 5

Ionic hydrides reacts with water to give

Accepted Answer

Ionic hydrides give the basic solution when it reacts with water, e.g., LiH + H _2 O LiOH + H _2

Question 6

Which one of the following is correct order of given isotopes? I. T_2>D_2>P_2 (order of boiling point) II. T_2>D_2>P_2 (order of bond energy) III. T_2=D_2=P_2 (order of bond length) IV. T_2 < D_2 < P_

Accepted Answer

Protium (P), deuterium (D) and tritium (T) are the three isotopes of hydrogen. These isotopes follow the order in different contexts as shown below : T_2>D_2>P_2 [Order of boiling point (BP)] T_2>D_2>P_2 [Order of bond energy .( BE ) ] T_2=D_2=P_2 [Order of bond length .( BL ) ] T_2 < D_2 < P_2 [Order of reactivity with Cl _2 ] Hence, all the given order are correct.

Question 7

ortho and para form of hydrogen have

Accepted Answer

Ortho and para hydrogen similar to each other in their chemical properties but they have different physical properties like boiling point, thermal conductivity, due to their difference in overall spins.

Question 8

The structure of H _2 O _2 is

Accepted Answer

Hydrogen peroxide ( H _2 O _2 ) is a non-planar molecule with twisted symmetrical structure. It has non-linear structure with an open book structure.

Question 9

Which one of the following statements in relation to the hydrogen atom is correct?

Accepted Answer

The hydrogen atom has the configuration 1 s and 3 s, 3 p and 3 d-orbitals will have same energy with respect to 1 s-orbital.

Hydrogen — Previous Year Questions & Solutions