Highly soluble hydroxide in water is formed by -
1. Ni2+
2. K+
3. Zn2+
4. Al3+
The strongest reducing agent among the following is:
1. K
2. Na
3. Al
4. Mg
When crystal of caustic soda is exposed to air, a liquid layer is deposited because:
1. crystal melts
2. crystal loses water
3. crystal absorbs moisture and CO2
4. crystal sublimes
Which one of the following is formed on dissolving I2 in aqueous solution of KI ?
1. KIO4
2. KIO
3. KI3
4. KIO3
Brine is chemically:
1. conc. solution of Na2CO3
2. conc. solution of Na2SO4
3. conc. solution of NaCl
4. conc. solution of alum
Common table salt becomes moist and does not pour easily in rainy season because:
1. It contains magnesium chloride.
2. It contains magnesium carbonate.
3. It melts slightly in rainy season.
4. Sodium chloride is hygroscopic.
A mixture of Al(OH)3 and Fe(OH)3 can be separated easily by treating it with:
1. HCl
2. NH4OH
3. HNO3
4. NaOH
Alkali metals are characterised by:
1. Good conductors of heat and electricity.
2. High melting points.
3. Low oxidation potentials.
4. High ionisation potentials.
The products of the electrolysis of aqueous solution of common salt are:
1. Na + Cl2
2. H2 + O2
3. NaOH + H2 + Cl2
4. NaOH + Cl2 + O2
KO2 is used in oxygen cylinder in space air craft and submarines because it:
1. absorbs CO2 and increase O2 content
2. eliminate moisture
3. absorbs CO2
4. produces O2