Answer:
HS+Na=>NaS+1/2H2(here HS- acts as an acid)
HS-. + HCl=> H2S(g)+ Cl-(here HS- acts as a base)
NaOH has the property of deliquescent hence it cannot be weighed directly instead a saturated solution is diluted and desired concentration is obtained.
Explanation:
Sodium hydroxide undergoes deliquescent.
Deliquescence is the process in which substance absorbs moisture and carbon dioxide from the atmosphere to the extent of getting dissolved and form a solution.
Deliquescence happens when vapour pressure of solution formed is less than the partial pressure of water vapour in the air.
This is the reason that student did not measure the sodium hydroxide directly as the weight will change and proper solution cannot be made. Because of the deliquescence standard solution of NaOH is not prepared.
The student made a solution without weighing the NaOH instead she prepared a solution till the NaOH got dissolved and then diluted the solution.
Answer:
<u>A. Jupiter , Saturn , Uranus and Neptune are mainly composed of gases more that solids and liquids.</u>
Explanation:
- The four planets- Jupiter , Saturn , Uranus and Neptune are called the outer planets of the solar system.
- <em>These planets are relativitely larger than the earth and other small planets and since these are primarily made up of gases , the are also called "</em><u><em>GAS GIANTS </em></u><em>"</em>
This is the largest planet in the solar system . There is not much solid surface at the Jupiter at all ! It is mainly made up of Hydrogen , some helium and other elements. The outer layer of the planet is made up of gas.
It is the second largest planet. This is also mainly composed of hydrogen and helium. But there is also ice of ammonia and water.
Uranus is a frozen , gaseous planet with a molten core. It contains 83% Hydrogen , 15% Helium and 2% methane which makes it gaseous enough
Neptune , like Uranus has an internal structure that is differentiated between a rocky core consisting of silicates and metals. It's atmosphere consists of Hydrogen, Helium and Methane.
Answer:Hydroxyl (OH) radicals – known as the detergent of the atmosphere – decompose isoprene in the air. This leads to the creation of new OH radicals, which are then able to purify the air of other pollutants and trace gases. ... The atmosphere has an astonishing ability to cleanse itself.
Explanation:
Periods (across) and groups (downwards)