The correct statement among the following regarding CsBr3 is -
1. It is a covalent compound.
2. It contains Cs2+ and Br- ions.
3. It contains Cs+, Br- and Br2 lattice molecules.
4. It contains Cs+ and ions.
Brine is chemically:
1. conc. solution of Na2CO3
2. conc. solution of Na2SO4
3. conc. solution of NaCl
4. conc. solution of alum
NO2 is obtained by heating:
1. CsNO3
2. KNO3
3. LiNO3
4. NaNO3
Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?
1. A light blue precipitate is first formed which finally dissolves to give a deep blue solution
2. A white precipitate appears which dissolves to give a colourless solution.
3. A white precipitation is formed which does not dissolve
4. No change takes place and the solution remains clear
Which has lowest thermal stability?
1. Li2CO3
2. Na2CO3
3. K2CO3
4. Rb2CO3
An alkali metal that reacts with nitrogen to form nitride is -
1. Li
2. Na
3. Cs
4. None of the above.
The most basic oxide among the following is:
1. Na2O
2. BaO
3. As2O3
4. Al2O3
The most dangerous method of precipitating hydrogen would be by the action of HCl on:
1. Zn
2. Fe
3. K
4. Al
Which is industrially prepared by the electrolysis of aqueous NaCl?
1. Na2CO3
2. NaHCO3
3. NaOH
4. NaOCl
Sodium cannot be extracted by the electrolysis of brine solution because:
1. sodium leberated reacts with water to produce NaOH+H2
2. sodium being more electropositive than hydrogen, H2 is liberated at cathod and not sodium
3. electrolysis cannot take place with brine solution
4. none of the above