Advertisements
Advertisements
प्रश्न
A is a reddish-brown metal, which combines with O2 at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B, and C with reaction.
Advertisements
उत्तर
(A) is a reddish-brown metal – Copper
\[\ce{2Cu + O2 ->[<1370K]\underset{\text{Cupric Oxide (Black)}}{2CuO(B)}}\]
\[\ce{4Cu + O2 ->[>1370K]\underset{\text{Cuprous oxide (Red)}}{2Cu2O(C)}}\]
A – Copper; B – Cupric oxide; C – Cuprous oxide.
APPEARS IN
संबंधित प्रश्न
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
Name a metal which is not malleable :
State two important uses of following metal:
Uses of silver
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Oxygen
With reference to the following metals state their use in daily life metal:
Lead
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
Match the columns.
| Group A | Group B |
| 1) Copper and Zinc | a) Brass |
| 2) Copper and Tin | b) Bronze |
| c) Stainless steel |
Halogen reacts with acid.
Which one of the following four metals would be displaced from the solution of its salts by other three metals?
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
______ is the metallic element.
