CBSE
Multiple Choice QuestionsAssertion : If red blood cells were removed from the body and placed in pure water, pressure inside the cells increases.
Reason : The concentration of salt content in the cells increases.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true, but reason is false.
Both assertion and reason are false statements.
A 5% solution (by mass) of cane sugar in water has freezing point of 271 K and freezing point of, pure water is 273.15 K. The freezing point of a 5% solution (by mass) of glucose in water is
271 K
273.15 K
269.07 K
277.23 K.
Assertion : The water pouch of instant cold pack for treating athletic injuries breaks when squeezed and NH4NO3 dissolves lowering the temperature.
Reason : Addition of non-volatile solute into solvent results into depression of freezing point of solvent.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
If an aqueous solution of glucose is allowed to freeze then crystal of which will be separated out first ?
Glucose
Water
Both (a) and (b)
None of these
Normal solution is :
inert solution
acidic solution
one litre containing one equivalent
basic solution
Assertion : When a concentrated solution is diluted by adding more water, molarity of the solution remains unchanged.
Reason : Product of moles of a solute and volume is equal to the molarity.
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.
The root mean square speed of the molecules of diatomic gas is u. When the temperature is doubled, the molecules dissociate into two atoms. The new rms speed of the atom is
u
2u
4u
Assertion : Addition of NH4OH to an aqueous solution of BaCl2 in the presence of NH4Cl (excess) precipitates Ba(OH)2.
Reason : Ba(OH)2 is insoluble in water.
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.
The vapour pressure will be lowest for :
0.1 M sugar solution
0.1 M KCl solution
0.1 M Cu(NO3)2 solution
0.1 M AgNO3 solution
Blood cells will remain as such in :
hypertonic solution
hypotonic solution
isotonic solution
none of the above
