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Class XI Chemistry States of Matter 8

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Question 1

In a cubic closed packed structure of mixed oxides, the lattice is made up of oxide ions,20% of tetrahedral voids are occupied by divalent A²⁺ ions and 50% of the octahedral voids by trivalent B³⁺.the formula of the oxide is:

Question 2

pH of a 0.1 M monobasic acid is measured to be 2. Its osmotic pressure at a given temperature TK is:

Question 3

Potassium crystallizes in a body centered cubic lattice. What is the approximate number of unit cells in 4.0g of potassium?

Question 4

Which of the following statements are correct in context of point defects in a crystal?

Question 5

At 300 K, the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen (N₂) at 4 bar. The molar mass of gaseous molecule (in g/mol) is:

Question 6

Initially, the root mean square (rms) velocity of N₂ molecules at certain temperature is u. If this temperature is doubled and all the nitrogen molecules dissociate into nitrogen atoms, then the new rms velocity will be:

Question 7

Two solutions A and B are separated by a semipermeable membrane. As a result of osmosis, the level of solution A is found to rise. It implies that –

Question 8

The plot of 1/x_A versus 1/y_A (where x_A and y_A are the mole fractions of A in liquid and vapour phases respectively) is linear whose slope and intercept respectively are given as –

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