Rbse Class 6 English most important question 2022 कक्षा 6 अंग्रेजी लीक पेपर वार्षिक परीक्षा

Most important question class 10 chapter 4 Quadratic equation

Iron (+II) is one of the most important oxidation states and salts are called ferrous salts. Most of the Fe(+II) salts are pale green and contain [Fe(H_(2)O)_(6_]^(2+) ion. Fe(+II) compounds are easily oxidised by air and so are difficult to obtain pure Fe^(2+) form many complexes like K_(4)[Fe(CN)_(6)] . Q. Anhydrous FeCl_(2) is made by :

Iron (+II) is one of the most important oxidation states and salts are called ferrous salts. Most of the Fe(+II) salts are pale green and contain [Fe(H_(2)O)_(6_]^(2+) ion. Fe(+II) compounds are easily oxidised by air and so are difficult to obtain pure Fe^(2+) form many complexes like K_(4)[Fe(CN)_(6)]. Q. K_(3)[Fe(CN)_(6)] is used in the detection of Fe^(2+) ion with which it gives a deep blue colour. This colour is due to the formation of :

Iron (+II) is one of the most important oxidation states and salts are called ferrous salts. Most of the Fe(+II) salts are pale green and contain [Fe(H_(2)O)_(6_]^(2+) ion. Fe(+II) compounds are easily oxidised by air and so are difficult to obtain pure Fe^(2+) form many complexes like K_(4)[Fe(CN)_(6)] . Q. FeSO_(4) is used in brown ring test for nitrates and nitrites. In this test, a freshly prepared FeSO_(4) solution is mixed with solution containing NO_(2)^(-) or NO_(3)^(-) and the conc. H_(2)SO_(4) is run down the side of the test tube. It the mixture gets hot or is shaken. (I) the brown colour disappear (II)NO is evolved (III) a yellow solution in Fe_(2)(SO_(4))_(3) is formed

NCERT Class 6 Geography Chapter 4: Maps | English | CBSE | Amandeep Lamba

Read the following passage and answer the questions that follows: In a class room, four students Sita, Gita, Rita and Anita are sitting at A(3, 4), B(6, 7), C(9, 4), D(6, 1) respectively. Then a new student Anjali joins the class (i) Teacher tells Anjali to sit in the middle of the four students. Find the coordinates of the position where she can sit. (ii) Calculate the distance between Sita and Anita. (iii) Which two students are equidistant from Gita.