COMPLEX NUMBERS | De Moivre's Theorem | JEE | Class 11 Maths | 4 PM By Pallavi Ma'am |L12| Doubtnut

12 PM Special Class | Class 11 - STRUCTURE OF ATOM || BOHR MODEL By Yakshu Ma'am

12:30 PM JEE Mains 2020 - Maths | Complex Numbers - 30 Days Score Booster Course

The number of carbon atoms in exactly 12 g C^(12) is called Avogadro's number , N_(A) (6.022 xx 10^(23)) . One mole is the amount of material which contains Avogradro's number of particle. These definitions emphasize that the mole refers to a fixed number of NA^(+) b Avogadro's number of atoms , electrons to refer to a mole of helium , a mole of electrons , or a mole of NA^(+) by Avogadro's number of atoms, electrons or ions respectively. On the other hand, phrases like "one mole of hydrogen" can be ambiguous , and should be restated as "one mole of hydroden atoms" or " one mole fo hydrogen molecules." But it is a matter of common practice among chemists , however , to let the name of the element stand for its mos common form. Thus one mole of O_(2) is frequently referred to as one mole of oxygen , whereas one moles of O is called one mole of oxygen atoms. Suppose if we take one mole molecules fo H_(2)SO_(4) then it contain 2 moles of H atom 1 mole of S atom and 4 moles of O atom. It can also be said that moles of oxygen molecules is (4)/(2) =2 mole. From a container having 64 g Oxygen , 11 .35 L oxygen gas at STP and 6.022 xx 10^(23) oxygen atoms are removed . Find the mass fo the oxygen gas left:

In each of the following questions, a sequence of groups of letters and number is given with one term missing as shown by (?). Choose the missing term out of the given alternatives. J2Z, K4X, 17V, ?, H16R, M22P 1) I11T 2) L11S 3) L12T 4) L11T 5) None of these

The approach to the following equilibrium was observed kinetically form both directions: [PtCl_(4)]^(2-) +H_(2)O hArr [Pt(H_(2)O)Cl_(3)]^(ɵ)+Cl^(ɵ) At 25^(@)C it was found that at 0.3 inoic strength - (Delta [PtCl_(4)]^(2-))/(Delta t) = (3.9 xx 10^(-5)s^(-1))[PtCl_(4)]^(2-) - (2.1 xx 10^(-3) L mol^(-1) s^(-1))[Pt(H_(2)O)Cl_(3)]^(ɵ)[Cl_(3)^(ɵ)] What is the value of k for the complexation of the fourth Cl^(ɵ) by Pt(II) at 0.3 ionic strenght.

A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In the afternoon of the same day, when the watch indicated quarter past 4 o^(prime)c loc k , the true time is 59 7/(12) m indotp a s t 3 (b) 4 p.m. 58 7/(11)m indotp a s t 3 (d) 2 3/(11) m indotp a s t 4