In the nitrogen family, the H-M-H bond angle in the hybrides MH3 gradually becomes closer to 90o if we move from N to Sb. This shows that gradually
1. | The basic strength of hybrides increases. |
2. | Pure p-orbitals (almost) are used for M-H bonding. |
3. | The bond energies of the M-H bond increase. |
4. | The bond pairs of electrons become nearer to the central atom. |
The correct statement regarding H3PO3 is:
1. Each hydrogen atom is attached to oxygen.
2. Two hydrogen atoms are attached to oxygen atoms.
3. One atom of H is attached to oxygen.
4. None of the above.
Why does fluorine not produce oxyacids?
1. It is most electronegative
2. It is the most powerful oxidising agent
3. It has vacant d- orbitals
4. None of the above
The correct increasing order for the acid strength of nitrogen oxides is:
1.
2.
3.
4.
The least acidic oxide among the following is:
1. P4O6
2. P4O10
3. As4O6
4. As4O10
Which of the following statements about H2SO4 is false:
1. It can act as an oxidising agent with copper
2. It acts as a dehydrating agent with sugar
3. It acts as an acid in its reaction with BaO2
4. It acts as a reducing agent in its reaction with Cu2O
Which of the following statements is false?
1. | H3PO2, H3PO3 and H3PO4 all are tribasic and reducing in nature. |
2. | \(NO_{3}^{-}\), \(SO_{3}^{2-}\), \(CO_{3}^{2-}\), and \(BO_{3}^{3-}\), only \(SO_{3}^{2-}\) have pπ-dπ bonding . | Amongst anions
3. | \(SO_{3}^{2-}\), \(SO_{4}^{2-}\), \(S_{2}O_{4}^{2-}\) and \(HSO_{4}^{-}\), \(SO_{3}^{2-}\) is basic and reducing in nature. | Amongst anions
4. | Number of lone pair(s) of electrons on Xe atoms in XeF2, XeF4 and XeF6 are 3, 2 and 1 respectively._ |
The oxidation states of the S atom in from left to right, respectively, are:
1. + 6, 0, 0, and +6
2. +5, +1, +1, and +5
3. +5, 0, 0, and +5
4. +3, +1, +1, and +3
What is produced when orthophosphoric acid reacts with phosphate rock (fluorapatite)?
1.
2.
3.
4.
Which of the following statements is false?
1. | Nitrous oxide supports combustion more vigorously than air. |
2. | Phosphorous pentaoxide dehydrates nitric acid-forming nitrogen pentaoxide. |
3. | Reactivity order of various allotropic forms of phosphorous is white > red > black. |
4. | Red phosphorous changes to white phosphorus on heating in the atmosphere of CO 2 or coal gas at 573 K. |