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1000 g aqueous solution of CaCO3 contains 10g of calcium carbonate. Hardness of the solution is:
(c) Hardness is expressed in g of CaCO3 present in 106g of H2O.
wt of CaCO3/ wt of solution x 106
Hydrogen absorbed on palladium is known as:
(c) Some transition metals such as Pt, Ni, Pd, Os, Cr, Mn, Fe, etc., absorb relatively large amount of hydrogen gas, which is called occluded hydrogen.
Which of the following acts as both reducing and oxidising agents ?
(b)
Decomposition of H2O2 is accelerated by:
(b) Metals in finely divided state possess larger surface area and are more reactive
Which method cannot be used to remove hardness of water ?
(d) The ions responsible for hard water are soluble in water.
In which reaction hydrogen is not formed ?
Copper is placed below hydrogen in electrochemical series. Hence it does not librate hydrogen gas with hydrochloric acid.
Which salt does not cause hardness of water ?
MgCO3 does not cause hardness of water.
Poorest reducing agent among following is
nascent hydrogen - newly born hydrogen is not stable form of hydrogen, it is very reactive and immediately reduce the metal or convert into molecular hydrogen.
hydrogen molecule is most stable form of hydrogen in free state. This is because the energy of hydrogen molecule is very high, 104 Kcal/mole.
A hydrogen atom is electrically neutral but the presence of unpaired electron makes it highly reactive. The hydrogen atom can either lose the electron and convert into a proton or accpet a second electron and acquire stable duplet configuration like that of Helium. Either way, the atomic hydrogen never stays stable with its unpaired electron which can act like a free radical.
H2O2 restores the colour of old lead paintings, blackened by the action of H2S gas, by:
Which of the following statements about hydrogen is incorrect?
(c,d) both option
For ionic salts, hydrogen never behaves as cation, but behaves as anion (H-).
H3O+ exists freely in solution.
Dihydrogen acts as a reducing agent.
Hydrogen has three isotopes.
Protium(11H)
Deuterium (21 H)
Tritium (31 H)
Protium is the most common isotopes of hydrogen with an abundance of 99.98%.
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