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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Thousands of Europeans migrated to America in the 19th century due to widespread poverty, unemployment and deadly diseases caused by poor living conditions and lack of opportunities in Europe. They sought better economic prospects and a safer life. Correct option ...
Water is transported through the xylem using transpiration pull. Evaporation from leaf surfaces creates a negative pressure, pulling water upward. Cohesion, adhesion, and capillary action help maintain continuous upward flow. cbse sample paper 2025 cbse sample paper 2025-26 class 10 science