What would be the freezing point of aqueous solution containing 17g of C2H5OH in 1000 g of water?
0.34°C
0.0°C
-0.34°C
-0.69°C
The pH of a solution is 5.0. If H+ ion concentration is decreased 100 times. Then the solution will be :
neutral
more acidic
basic
of the same acidity
Rusting of iron is a chemical reaction. The reaction is :
double decomposition
combination
displacement
analysis
B.
combination
Rusting of iron is a type of redox reaction, i.e. a combination of both oxidation and reduction reaction. Hence, a combination reaction.
The 3rd transitional series contain elements having atomic numbers from:
21 to 29
21 to 30
20 to 30
21 to 31
Which one of the following colloidal solution is positive sol?
Gelatin in strongly acidic solution
Smoke
Dlay soil
Blood
How many grams of CaC2O4 will dissolve in distilled water to make one litre of saturated solution? Solubility product of CaC2O4 is 2.5 x 10-9 mol2 litre-2 and its molecular weight is 128
0.0640 gm
0.0032 gm
0.0128 gm
0.0064 gm
In the complex [Co(en)2Cl2 ] Br, the co-ordination number and oxidation state of cobalt are
6 and +1
6 and +3
3 and +3
4 and +2