281.

The 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

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

The osmotic pressure of blood is 8.21 atm at 37$°$C. 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

A solution made by dissolving 40 g NaOH in 1000 g of H₂O is

• 1 molar

• 1 normal

• 1 molal

• None of these

0.1 mol HCl is equal to

• 3.65 g

• 36.5 g

• 18 g

• 1.8 g

A 0.5 g/L solution of glucose is found to be isotonic with a 2.5 g/L solution of an organic compound. What will be the molecular weight of that organic compound ?

• 300

• 600

• 900

• 200

The pH of a 0.001 M solution of HCl is

• 0

• 3

• 5

• 10

The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass Al= 27)

• 180 kg

• 270 kg

• 540 kg

• 90 kg

The number of moles of KMnO₄ reduced by one mole of KI in alkaline medium is

• one-fifth

• five

• one

• two