CBSE
Multiple Choice QuestionsThe number average molar mass and mass average molar mass of a polymer are respectively 30,000 and 40,000. The
polydispersity index (PDI) of the polymer is
-1
0
> 1
< 1
For preparing 3.00 L of 1M NaOH by mixing portions of two stock solutions (A and B) of 2.50 M NaOH and 0.40 M NaOH respectively. Find out the amount of B stock solution (in L) added.
8.57 L
2.14 L
1.28 L
7.51 L
An element, X has the following isotopic composition;
200X: 90%
199X : 8.0%
202X ; 2.0 %
The weighted average atomic mass of the naturally -occurring element X is closet to:
200 amu
201 amu
202 amu
202 amu
What would be the heat released when an aqueous solution containing 0.5 mole of HNO3 is mixed with 0.3 mole of OH-? (enthalpy of neutralisation is- 57.1 kJ)
28.5 kJ
17.1 kJ
45.7 kJ
1.7 kJ
11.2 L of gas at STP Weight 14g. The gas would be
H2
CO
B2H6
All of these
A solution made by dissolving 40 g NaOH in 1000 g of H2O is
1 molar
1 normal
1 molal
None of these
Work is being performed, when a weight lifter lifts a base ball off a weight rack. This is due to
magnetic attraction
gravity
electrostatic repulsion
mechanical force
The osmotic pressure of blood is 8.21 atm at 37C. How much glucose would be used for an injection that is at the same osmotic pressure as blood?
22.17 gL-1
58.14 gL-1
61.26 gL-1
75.43 gL-1
0.001 mole of [Co(NH3)5(NO3) (SO4)] was passed through a cation exchanger and the acid coming out of it required 20mL of 0.1 M NaOH for neutralisation. Thus, the complex is
[Co(NH3)5(NO3)] SO4
[Co(NH3)5(SO4)]NO3
[Co(NH3)5] NO3.SO4
None of the above
In order to prepare one litre 1N solution of KMnO4, how many grams of KMnO4 are required, if the solution to be used in acid medium for oxidation?
128g
41.75 g
31.60 g
62.34 g
