GATE MT 2018 Paper 1 — page 21

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

For the reaction: 4Ag(s, pure) + O

(g) → 2Ag

O(s, pure), the standard enthalpy change,

, and the standard entropy change,

, in the temperature range from 298 K to 500 K. The temperature above which Ag

O decomposes in an atmosphere containing oxygen at a partial pressure

is ______ (in K to one decimal place). Given: Gas constant R = 8.314 J K

mol

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In a powder diffraction experiment on BCC iron, the first peak occurs at

. The wavelength of X-rays is ______ (in nm to three decimal places). Given: The lattice parameter of iron = 0.287 nm

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A 1 mol piece of copper at 400 K is brought in contact with another 1 mol piece of copper at 300 K, and allowed to reach thermal equilibrium. The entropy change for this process is ______ (in J K

to three decimal places) Given: Specific heat capacity of copper (between 250 K and 500 K) is 22.6 J K

mol

. Assume that the system containing the two pieces of copper remains isolated during this process.

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2018 · Paper 1

Question 51

Question 52

Question 53