(ii) Could this substance be kept in car radiator during summer( very 10.(a) () Briefly explain the effect of presence of impurities on a pure solvent in respect of its
freezing point.
(ii) In an experiment 1.35g of solute were dissolved in 72.3cm' of water and the solution was
found to boil at 100.162°C and latm. If the boiling point constant for 100g of water is 5.2.
Calculate the molecular weight of the solute.
(b) The molar volume of liquid benzene ( density 0.877gcm') increased by a factor of 2750 as it
vapourises at 20°C and that of liquid toluene ( density 0.867gcm') increased by factor of 7720
at 20°C. A solution of benzene and toluene at 20°C has a vapour pressure of 46.0torr. Find the
mole fraction of benzene in the vapour above the solution.
11.(a)(i)In calculations involving boiling point elevation and freezing point depressions, molality and
not molarity is used. Explain this observation.
(ii) Explain the significance of Vant Hoff's factor.
(b) 0.008M Na2C204 is isotonic with 0.01M sucrose. Calculate degree of dissociation of Na2C204.
Page 3 of 4

passing a magnet thought the

mixture , because iron gets attracted to magnet .

when—without warning—something provokes your anger, you may struggle not to succumb to it. since what typically makes you mad is feeling powerless in the face of what seems unfair, your anger is mostly an attempt at a “quick fix” to right the balance. it’s as though you’re raising a fist in protest, proclaiming that you’re not going to capitulate to such injustice.

there are, however, a multitude of problems related to this immediate, push-back reaction of anger. and probably the key one is that almost never does it resolve the issue that gave rise to it. such reactive anger is probably best understood as self-defeating. as david burns, the author of the seminal self- book feeling good, observes: if realistically, acting on your anger is to make any sense, it needs to meet two criteria—which, in almost every case, is frankly impossible. that is, your anger must:

be directed toward a person who has intentionally (and needlessly) behaved in a hurtful way toward you; and

be beneficial or advantageous to you (i.e., assist you in achieving a desired goal).

i think you’ll agree that only rarely can you claim that your anger is both warranted and , whether to yourself or the relationship.

so let me offer you a two-step alternative to abandoning your better judgment and giving in to the temptation of anger—one that should neutralize your anger in seconds. or, when you’re really angry, in minutes.

but keep in mind that you must really want to execute these steps, be sufficiently motivated to perform them. which means overcoming more unconscious resistance than you might ever have imagined. because there are many immediate “advantages” of anger that can interfere with your resolve, i’ll suggest a few of them that might interfere with your employing this powerful method to rid yourself of counter-productive anger.

explanation:

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

that's what i got you can count the number of atoms