Two gases NO and `O_(2)` were introduced at the two ends of a `1m` long tube simultaneously ( tube of uniform cross-section) . At what distance from NO gas end , Brown fumes will be seen.

NH_(3) and HCl gas are introduced simultaneously from the two ends of a long tube. A white ring of NH_(3)Cl appears first

At room temperature, ammonia gas at 1 atm pressure and hydrogen chloride gas at P atm pressure are allowed to effuse through identical pin holes from opposite ends of a glass tube of 1 m length and of uniform cross- section. Ammonium chloride is first formed at a distance of 60 cm from the end through which HCl gas is sent in. What is the value of P ?

At room temperature, ammonia gas at 1 atm pressure and hydrogen chloride gas at P atm pressure are allowed to effuse through identical pin holes from opposite ends of a glass tube of 1 m length and of uniform cross- section. Ammonium chloride is first formed at a distance of 60 cm from the end through which HCl gas is sent in. What is the value of P ?