How many neutrons are there in nucleus 'X', if it gives 7N14 after two successive - particle emissions ?
7
10
14
09
2.0 molar solution is obtained, when 0.5 mole solute is dissolved in :
250 ml solvent
250 g solvent
250 ml solution
1000 ml solvent
What will be the normality of a solution, containing 4.9 g. H3PO4 dissolved in 500 ml water ?
0.3
1.0
3.0
0.1
A.
0.3
Given that, volume = 500 mL = 0.5 litre
weight of solute (w) = 4.9 g
equivalent weight of
H3PO4 =
= =
Hence, normality of solution (N)
=
= = 0.3N
The solution obtained by adding water to alcohol, shows :
+ve deviation from Raoult's law
ideal behaviour
-ve deviation from Raoult's law
application of Henry's law
According to Bohr, the angular momentum of an electron, in any orbit, should be :
h/2
nh/2
h/mv
2/nh
pH of a solution of 10 mL 1N sodium acetate and 50 mL 2N acetic acid (Ka = 1.8 x 10-5), is approximately :
4
5
6
7
The values of Ksp for CuS, Ag2S and HgS are 10-31, 1042, 10-54 respectively. The correct order of their solubility in water is :
AgS > HgS > CuS
HgS > Cus > Ag2S
HgS > Ag2S > Cus
Ag2S > CuS > HgS