In Dennis method fluorine prepared in the electrolytic cell is passed through U- tubes containing sodium fluoride to remove HF vapors present in fluorine as` NaHFunderset(2) `.The compound `NaHFunderset(2)` contains the species

KF combines with HF to form KHF_(2) The compound contains the species .

The same amount of electricity was passed through molten cryolite containing Al_(2)O_(3) and NaCl. If 1.8 g of Al were liberated in one cell, the amount of Na liberated in the other cell is

A current of 10 A is passed for 80 min and 27 seconds through a cell containing dilute sulfuric acid. (1) How many moles of oxygen gas will be liberated at the anode ? (2) Calculate the amount of zinc deposited at the cathode when another cell containing ZnSO_(4) solution is connected in series.

(i) Why could fluorine not be prepared for a long time from HF and metal fluorides either by electrolysis or by any chemical reaction ? (ii) Describe the modern method for the preparation of fluorine by giving: (a) Materials used in the construction of the cell. (b) Electrolyte used. (c) Electrode reactions.

In Ostwald and Walker's appratus, dry air is passed through a solution containing 20 gram of an organic non-volatile solute in 250 ml of water. Then the air was passed through pure water and then through a U-tube containing anhydroous CaCl_(2) . The mass lost in solution is 26 gram and the mass gained in the U-tube is 26.48 gram. Calculate the molecular mass of organic solute.

A 100 ml mixture of CO and CO_2 is passed through a tube containing red hot charcoal. The volume becomes 160 ml.The volumes are measured under the same conditions of temperature and pressure Amongst the following , select the correct statement(s).

What are reactions involved in removing SO_(2) from the atmosphere by passing it through a solution containing citrate ions ?

3 faraday electricity was passed through the three electrolytic cells connected in series containing Ag^(+)Ca^(2+) and Al^(+3) ions respectively. The molar ration in which the three metl ions are liberated at the electrodes is :

(a) A steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO_(4) and ZnSO_(4) until 2.8 g of Fe deposited at the cathode of cell X. How long did the current flow ? Calculate the mass of Zn deposited at the cathode of cell Y (Molar mass : Fe= 56 g mol^(-1) Zn-65.3g mol^(-1) , 1F -96500 C mol^(-1) ) (b) In the plot of molar conductivity (wedge_(m)) vs Square root of concentration (c^(1//2)) , following curves are obtained for two electrolytes. A and B: Answer the following : (i) Predict the nature of electrolytes A and B. (ii) What happens on extrapolation of wedge_(m) to concentration approaching zero for electrolytes A and B ?

1 L of a mixture of CO and CO_(2) , when passed through red hot tube containing charcoal, the volume becomes 1.6 L. all volumes are measured under the same conditions of temperature and pressure. Find the composition of the mixture.