Classification of Elements and Periodicity in Properties
- In which of the following options the order of arrangement does not agree with the variation of property indicated against it ? Answer: 3. I < Br < Cl < F (increasing electron gain enthalpy) Key idea: compare each series with the real trend. Option 1: isoelectronic io... 1
- Which of the following statements is false ? Answer: 3. Ca²⁺ ions are not important in maintaining the regular beating of the heart. Key idea: mathrmCa²⁺ and mathrmMg²⁺ both have import... 1
- Which of the following statements about hydrogen is incorrect ? Answer: 1. Hydrogen has three isotopes of which tritium is the most common. Key idea: check each statement against NCERT facts and pick the... 1