Some Basic Conc...

0.5g sample of a sulphite salt was dissolved in 20ml solution and 20ml of this solution required 10ml of 0.002M acidified permanganate solution. Hence, the $$\%$$ by mass of sulphite in the sulphite salt is:

The percentage of $$Se$$ in peroxidase anhydrous enzyme is $$0.5$$% by weight (atomic weight $$= 78.4$$). Then minimum molecular weight of peroxidase anhydrous enzyme is:

The amonia evolved from 2g of a compound in Kjeldahl's estimation of nitrogen neutralizes 10 mL of 2 M $${ H }_{ 2 }S{ O }_{ 4 }$$ solution. The weight percentage of nitrogen in the compound is

During the preparation of $$H_{2}S_{2}O_{8}$$ (per disulphuric acid) $$O_{2}$$ gas also releases at anode as by product. When $$9.72\ L$$ of $$H_{2}$$ releases at cathode and $$2.35\ L\ O_{2}$$ at anode at STP, the weight of $$H_{2}S_{2}O_{8}$$ produced in gram is:

The mass of a mixture containing HCl and $$H_2SO_4$$ is 0.1 g. On treatment with an excess of an $$AgNO_3$$ solution, reacted with this acid mixture gives 0.1435 g of AgCl. Mass % of the $$H_2SO_4$$ mixture is :

If $$224ml$$ of triatomic gas has a mass of $$1g$$ at $$273K$$ and $$1atm$$ pressure, then the mass of one atom is-

5 g of a sample of bleaching powder is treated with excess acetic acid and KI solution. The liberated $$I_2$$ required 50 ml of N/10 hypo solution. The % available chlorine in sample is

When a mixture of $$NaBr$$ and $$NaCl$$ is repeatedly digested with sulphuric acid, all the halogens are expelled and $$Na_{2}SO_{4}$$ is formed quantitatively. With a particular mixture, it was found that the weight of $$Na_{2}SO_{4}$$ obtained was precisely the same as the weight of $$NaBr - NaCl$$ mixture taken. Calculate the ratio of the weights of $$NaCl$$ and $$NaBr$$ in the mixture.

What is the mass percentage of carbon tetrachloride if $$22g$$ of benzene is dissolved in $$122g$$ of carbon tetrachloride?

Which one of the following is not required for the formation of photochemical smog?