The hydrides ion is a stronger base than its hydroxide ion . Which of the following reactions will occur if sodium hydride is dissolved in water –
(A)
(B)
(C)
(D)
Blackened oil planting can be restored into original form by the action of:
1. Chlorine
2.
3.
4.
Which of the following statement regarding is wrong.
(1) It is stable in acid medium
(2) It acts as oxidising as well as reducing agent
(3) It has zero dipole moment
(4) Pure is slightly acidic
Polyphosphates are used as water softening agents because they –
(1) form soluble complexes with anionic species
(2) precipitate anionic species
(3) form soluble complexes with cationic species
(4) precipitate cationic species
Permanent hardness of water can be removed, by adding –
(1) Soda lime
(2) Sodium bicarbonate
(3) Washing soda
(4) Sodium chloride
The correct increasing order of the acidity of is
(1)
(2)
(3)
(4)
At absolute zero.
(1) Only para hydrogen exists
(2) Only ortho hydrogen exists
(3) Both para and ortho hydrogen exist
(4) None of these
Metal which does not react with cold water but evolves H2 with steam is –
(1) Na
(2) K
(3) Pt
(4) Fe
The oxidation states of the most electronegative element in the products of the reaction between with dil. are–
1. 0, and –1
2. –1, and –2
3. –2, and 0
4. –2, and + 1
Hardness of water is due to presence of salts of –
(1)
(2)
(3)
(4)