CBSE
Multiple Choice QuestionsMnO (1 mole) in neutral aqueous medium is disproportionated to
2/3 mole of MnO and 1/3 mole of MnO2
1/3 mole of MnO and 2/3 mole of MnO2
1/3 mole of Mn2O7 and 1/3 mole of MnO2
2/3 mole of Mn2O7 and 1/3 mole of MnO2
Phenolphthalein is not suitable for the titration of :
NaOH vs (COOH)2
KOH vs H2SO4
K2CO3 vs HCl
none of the above
36 g water and 828 g ethyl alcohol form an ideal solution. The mole fraction of water in it, is :
1.0
0.7
0.4
0.1
A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. What is the density of sodium chloride?
1.2 g/cm3
2.165g/cm3
3.64 g/cm3
4.56 g/cm3
Assertion : Effusion rate of oxygen is smaller than nitrogen.
Reason: Molar mass of nitrogen is smaller than oxygen.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
How many litres of ammonia gas at S.T.P. would 1 be needed to prepare 100 ml of 2.5 M ammonium hydroxide solution?
5.6 L
0.056 L
11.2 L
0.56 L
The weight of one molecule of a compound C60H120 is :
1.2 x 10-20 g
5.025 x 1023 g
1.4 x 10-21 g
6.023 x 1023 g
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
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
The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g is added to 39.0 g of benzene (molar mass 78 g/mol). The vapour pressure of the solution then is 0.845 bar. What is the molecular mass of the solid substance?
58
180
170
145
