8.0 g
4.0 g
0.8 g
0.4 g
Correct answer is D
let the divalent metal be Q
Q + 2HCl → QCl2 + H2
1mole of Q liberated 1 mole of Hydrogen gas ( one mole of any gas at STP has a volume of 22400cm^3 or 22.4dm^3 )
40 → 22400cm^3
? → 224cm^3
mass of Q = \(\frac{ 40 \times 224}{22400}\)
mass of Q = 0.4g.
Brownian movement
condensation
evaporation
liquefaction
Correct answer is C
No explanation has been provided for this answer.
water
moist SO2
acidified KMnO4 and water
water, acidified KMnO4 and oxygen
Correct answer is B
No explanation has been provided for this answer.
nitrogen is less soluble than oxygen
oxygen is heavier than nitrogen
nitrogen has a higher partial pressure in air
gases are hydrated in water
Correct answer is A
the ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air. This is because oxygen in the air has a higher solubility than other elements in the air and also there is hydrogen bonding between water and oxygen that increases its solubility.
The energy changes accompanying the addition of an electron to a gaseous atom is called?
first ionization energy
second ionization energy
electron affinity
electronegativity
Correct answer is C
No explanation has been provided for this answer.