NOTES

NCERT solutions for class 10 maths by entrancei

CHEMICAL PROPERTIES OF CARBON FAMILY  (1)        Reactivity towards acids : C, Si, Ge unaffected by dilute acid but Sn dissolves in dilute HNO 3   forming Sn(NO 3 ) 2 . Pb dissolves slowly in dilute HCl forming PbCl 2   and quite readily in dilute HNO 3   forming Pb(NO 3 ) 2   and oxides of nitrogen.             Si is oxidised and undergoes fluorination by hot concentrated HF/HNO 3 .             Sn dissolves in several concentrated acids. Pb does not dissolves in concentrated HCl because a surface coating of PbCl 2   is formed. (2)       Reactivity towards alkalies : Carbon is unaffected by alkalies. Si reacts slowly with cold aqueous solution of NaOH and readily with hot NaOH solution giving solution of silicates [SiO 4 ] 4– . Sn and Pb are amphoteric it dissolve...

NCERT Solutions for Class 11 Biology & NCERT text book both are highly recommended for your class 11 exam as well as board exam , as in this class your basics fundamental develops . while reading the theory of class 11 Biology from NCERT you must notes down important points , entrancei academic team build up strong content for class 11 Biology and entrancei consist of biology gives you 360 way of practice . wondering how ? let’s start with chapter-1 of NCERT follow the steps like , step-1 read NCERT text Book make your notes try all the questions given in NCERT text book exercise by your own concepts and refer entrancei NCERT solutions for class 11 Biology , after doing this step follow step-2 , now read the additional theory of biology class 11 prepared by expert faculty members and add additional points in your notes while reading the theory from entrancei notes sections . Step-3 solve the MCQ of the chapter given in entrancei exercise sections step-4 Now the t...