Which of the following statements is incorrect?
1. | NaHCO3 on heating gives Na2CO3. |
2. | Pure sodium metal dissolves in liquid ammonia to give a blue solution. |
3. | NaOH reacts with glass to give sodium silicate. |
4. | Aluminium reacts with excess NaOH to give Al(OH)3. |
Which of the following oxide is amphoteric?
1. CO2
2. SnO2
3. CaO
4. SiO2
Incorrect statement among the following about zeolites is:
1. | They have an open structure which enables them to take up small molecules. |
2. | Zeolites are aluminosilicates having a three-dimensional network. |
3. | Some of the \(\mathrm{SiO}_4^{4-}\)units are replaced by \(\mathrm{AlO}_4^{5-}\) and \(\mathrm{AlO}_6^{9-}\) ions in zeolites. |
4. | They are used as cation exchangers. |
In a Borax bead test, which compound is formed:
1. Orthoborate
2. Metaborate
3. Double oxide
4. Tetraborate
The most probable oxidation state of Pb & Sn will be:
1.
2.
3.
4.
Which of the following oxide is amphoteric in nature?
1. SnO2
2. SiO2
3. GeO2
4. CO2
Identify the correct statements from the following:
(a) | \(\mathrm{CO}_2(\mathrm{~g})\) is used as a refrigerant ice cream and frozen food. |
(b) | The structure of \(\mathrm{C}_{60} \) customs12 six carbon rings and 25 five carbon rings |
(c) | ZSM-5, a type of zeolite, is used to convert alcohol into gasoline. |
(d) | CO is a colorless and odorless gas. |
1. | (a) and (c) only | 2. | (b) and (c) only |
3. | (c) and (d) only | 4. | (a), (c) and (d) only |
1. | Both the Boron atoms are sp2 hybridised. |
2. | There are two 3-centre-2-electron bonds. |
3. | The four terminal B-H bonds are two centre two-electron bonds. |
4. | The four terminal Hydrogen atoms and the two Boron atoms lie in one plane. |
1. | Both diamond and graphite are used as dry lubricants. |
2. | Diamond and graphite have a two-dimensional network. |
3. | Diamond is covalent and graphite is ionic. |
4. | Diamond is sp³ hybridised and graphite is sp² hybridized. |
Which of the following is the correct statement?
1. Ga+ is more stable than ln+.
2. Al+ is more stable than ln+.
3. Ga+ is more stable than Al+.
4. Al+ is more stable than Ga+.