The freezing point of heavy water in comparison to normal water is -
1. Higher
2. Lower
3. Same
4. None of the above
Match the column:-
Column I | Column II |
A. Heavy water | P. Bicarbonates of Ca & Mg |
B. Temporary hardness | Q. No foreign ions |
C. Soft water | R. D2O |
D. Permanent Hardness | S. Sulphates of Ca & Mg |
A | B | C | D | |
1. | S | P | Q | R |
2. | R | P | Q | S |
3. | P | Q | R | S |
4. | S | R | P | Q |
Covalent hydride among the following is -
1.
2.
3.
4.
The correct statement among the following regarding H2O2 is-
1. Two hydrogen atoms are connected to one oxygen atom.
2. All the four atoms are in the same plane.
3. The four atoms are arranged in a non-linear and non-planar manner.
4. O-H bonds are polar but the molecule is non-polar.
act as a reducing agent in :
1. Reaction with a ferrous salt.
2. Reaction with iodides.
3. Reaction with lead sulphide.
4. Reaction with in an acid medium.
The correct order of increasing reducing nature is -
1. NaH > H2O < MgH2
2. > > NaH
3. < < NaH
4. < NaH
The method used to remove the temporary hardness of water is-
1. Synthetic resins method
2. Calgon's method
3. Clark's method
4. Ion-exchange method
Dihydrogen gas cannot be prepared with-
1. Cu + HCl (dil.)
2. Fe + H2SO4
3. Mg + steam
4. Na + alcohol
The reaction of aqueous KMnO4 with H2O2 in acidic condition gives:
1.
2.
3.
4.
A water softening reagent among the following is -
1.
2.
3.
4.