What are the constituents of German silver ?

German silver varies in composition, the percentage of the three elements ranging approximately as 60% copper, 20% nickel and 20% zinc.

Answer 2AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2Ag (s) Silver Nitrate + Copper → Copper Nitrate + Silver

The process of German unification was continued by Prussia after the defeat of the liberal, middle-class Germans at the hands of the aristocrats and the military in 1848. Its chief...

Phloem is the food conducting tissue in plants. It is made up of four components:  (i) Sieve tubes  (ii) Companion cells  (iii) Phloem parenchyma  (iv) Phloem fibres 

Atomic mass of silver (Ag) = 108 u  Since mass of 6.022 × 1023 atoms of silver (Ag) = 108 u  Hence mass of 3.011 × 1023 atoms of silver (Ag)  = 108×3.011×1023/...

Mass of silver = m g  Mass of gold = m /100g  Number of atoms of silver =  Mass/ Atomic mass X NA                        ...

(a) Fossil fuels are coal, petroleum and natural gas.  (b) Process of separation of different constituents from petroleum is called refining.  (c) Least polluting fuel for vehicles is CNG.

[Hint : Drugs used to check pregnancy in women to control birth rate. Oral contraceptives contains a mixture of synthetic estrogen and progesterone derivatives.

(C) Formation of compost from vegetable matter. Reactions given in option (A), (B) and (D) are examples of endothermic reactions and require energy in form of heat, light and electricity respectively....