Correct option – B. Iron nail in P (CuSO₄) undergoes displacement: copper ions reduced to copper metal, giving a brownish coating; in Q (AgNO₃) iron displaces silver, producing a silver coating on the nail during the reaction. cbse sample paper 2025 ...
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Correct option – D. Sodium hydroxide. Among the options, NaOH is a strong, highly soluble base producing a high concentration of OH⁻ in solution; magnesium hydroxide is sparingly soluble and both acids give low pH values generally. cbse sample paper 2025 ...
Yes, CBSE has released the official sample papers for the 2025–26 session on its academic website. Students can also visit Tiwari Academy, which provides the latest CBSE sample papers, marking schemes, and expert solutions — ideal for scoring above 95%.
The Silk Route enabled exchange of goods and culture — Chinese pottery, Indian textiles and spices moved to Europe, while gold and silver returned. Along these routes, Buddhism, Christianity and Islam also spread widely, linking distant civilizations spiritually and economically. cbse ...
In this context, tyrants refer to absolutist institutions like monarchy and the church. Mercier believed that printed books and new ideas would challenge their authority, spreading freedom and enlightenment among the masses. Correct option – B. cbse sample paper 2025 cbse sample ...