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Class 11 · Mathematics · Expert
→From (5) mathematics, (4) physics, and (3) chemistry books, (6) books are to be selected. The selection must contain books from exactly (2) subjects. How many selections are possible?
Class 11 · Mathematics · Hard
→A shelf has (4) distinct mathematics books, (3) distinct chemistry books, and (2) distinct biology books. If books of each subject must be kept together, how many arrangements are possible?
Class 11 · Mathematics · Hard
→One book is to be selected from each of four subjects. Mathematics has (5), Physics has (4), Chemistry has (6), and Biology has (3) books. The first Mathematics book and the second Chemistry book cannot be selected together. How many selections are possible?
Class 10 · Mathematics · Medium
→In a class of 110 students, 68 study Biology, 57 study Chemistry, and 32 study both subjects. How many students study neither Biology nor Chemistry?
Class 10 · Mathematics · Easy
→Among 90 students, 43 like Chemistry, 39 like Biology, and 18 like both subjects. How many like neither subject?
Class 12 · Chemistry · Easy
→A student sees i < 1 and writes dissociation. What is the correct correction?
Class 12 · Chemistry · Medium
→A 1:3 electrolyte is 50% dissociated. What is its van’t Hoff factor?
Class 12 · Chemistry · Easy
→If the osmotic pressure of a solute is 20% lower than the normal value, what are i and the likely cause?
Class 12 · Chemistry · Medium
→For 25% dissociation of an AB₃ salt, what fraction of the true molar mass will be its observed molar mass?
Class 12 · Chemistry · Easy
→Which option gives the correct relation for m-fold association?
Class 12 · Chemistry · Medium
→In a solution, 0.01 mol of A₂B₃ undergoes 60% dissociation. How many moles of effective particles will be present?
Class 12 · Chemistry · Medium
→If 60% of a solute remains as normal molecules and 40% of it dimerises, what is the van’t Hoff factor?
Class 12 · Chemistry · Medium
→For a substance, the van’t Hoff factor is 3.25, and one formula unit can produce five ions on complete dissociation. What is the degree of dissociation?
Class 12 · Chemistry · Easy
→If a solute is normally undissociated and does not undergo association, what should the van’t Hoff factor be by all four colligative methods?
Class 12 · Chemistry · Medium
→For an AB2 salt, if i = 2.0, what is the percentage dissociation?
Class 12 · Chemistry · Easy
→The molar mass determined from osmotic pressure is greater than the true molar mass. Which phenomenon does this indicate?
Class 12 · Chemistry · Easy
→If a solute has i = 1.25, how much higher will its colligative effect be than the normal value?
Class 12 · Chemistry · Medium
→In a solution, BaCl2 is 50% dissociated. What is its van’t Hoff factor, i?
Class 12 · Chemistry · Easy
→If the molar mass obtained by osmotic pressure is lower than the true molar mass, which conclusion is most suitable?
Class 12 · Chemistry · Medium
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