Convert the following into basic units.
15.5 \(\mu s\)

Calculate
(5.7 x 10^-5) \(\div \) (4.2 x 10^-3)

The density of 3 M solution of Na Cl is 1.25 g mL^-1. Calculate molality of the solution.

(i) Assuming the density of water  to be 1g/cm³, calculate the volume occupied by one molecule of water

50.0 kg of \({ N }_{ 2 }(g)\) and 10.0 kg of \({ H }_{ 2 }(g)\) are mixed to produce \(NH_{ 3 }(g)\)formed. Identify the limiting reagent in the productuion of \(NH_{ 3 }\) in this situation.

An organic substance containing carbon, hydrogen and oxygen gave the percentage composition as C = 40.687 % , H = 5.05 %. The vapour density of the compound is 59. Calculate the molecular formula of the compound.

Wilhelm Rontgen showed that when electrons strike a material in the cathode ray tube, some rays are originated that can cause fluorescence in the fluorescent material placed outside the cathode ray tubes. He named these rays as X-rays as these were not deflected by electric and magnetic field. X-rays are used as a diagnostic tool in the treatment of disease and bone fracture. An intelligence officer, John catched a smuggler by using this X-ray machine. He was trying to smuggle the drugs while travelling abroad.
What values are not possessed by John? What measures should be taken to prevent this?

Calculate \(\triangle _{ r }G^{ \ominus }\) for conversion of oxygen to ozone, 3/2 O₂(g) \(\rightarrow \) O₃(g) at 298 K_p. If Kpfor this
conversion is 2.47 x 10^-29.

Which of the following species, do not show disproportionation reaction and why?
   \(CI{ O }^{ - },Cl{ O }_{ 2 }^{ - },Cl{ O }_{ 3 }^{ - }\) and \(Cl_{ 4 }^{ - }\)
Also write reaction for each of the species that disproportionates

In India, there is the shortage of drinking water. Thus, projects like rainwater harvesting are used by Green Park Association to increase the amount of underground water. Rainwater is the almost pure form of water after the heavy shower as it is, in fact, the distilled water. The first shower contains dissolved gases from the atmosphere. Being a good solvent, when it flows on the surface of the earth, it dissolves many salts in the form of hydrogen carbonate, chloride and sulphate in water which make it hard
Give the values possessed by the office bearer of Green Park Association?

Reema takes milk every day . She also take curd and other milk products.She takes green leafy vegitables and fruits also. An adult body contains about 25g of magnesium and 1200 g of calcium and 5 g of iron .these elements must be a part of our diet. All enzymes that utilize ATP in phosphate transfer required magnesium as co-factor. the main pigment for the absorption of light in plants is chlorophyll, which contains magnesium. were as Anita does not like milk and takes lot of junk food.
Write some rich sources of calcium?

How will you distinguish between
(iv) LiCl and KCl

On complete combustion, 0.246 g of an organic gave 0.198% of carbon dioxide and 0.1014 g of water.Determine the percentage composition of carbon and hydrogen in the compound

In carius method of estimation of halogen, 0.15 g of an organic compound gave 0.12 of AgBr Find out the percentage of bromine in the compound

Which of the following compounds will show cis-trans isomerism?
CH₂=CBr₂