CBSE chemistry
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What is the effect of temperature on chemisorption?
Chemisorption increases with increase in temperature at a certain level and then starts decreasing.
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What is the role of zinc metal in the extraction of silver?
In the extraction of silver, zinc metal act as reducing agent.
2[Ag(CN)2]-(aq.) + Zn(s) --> 2Ag(s) + [Zn(CN)4]2-(aq.)
What is the basicity of H3PO3?
H3PO3 ionises to give two H+ ions. Thus, it is dibasic in nature.
H3PO3 --> 2H+ + HPO2-3
Identify the chiral molecule in the following pair:
A chiral molecule in which one of the carbon atom bearing four different groups. In the following pair of molecules, the chiral molecule is
An element with density 2.8 g cm−3 forms of the f.c.c. unit cell with edge length 4 X10−8 cm. Calculate the molar mass of the element.
(Given: NA = 6.022 X 1023 mol −1)
Edge length, a = 4 x 10-8 cm
Density, d = 2.8 g cm-3
As the lattice is fcc type, the number of atoms per unit cell, z is 4.
Avogadro's number, NA = 6.022 x 1023 mol-1
Molar mass can be calculated with the help of given relation:
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Mock Test Series
Mock Test Series