Doubtify – JEE Ki Taiyaari, Simple Bhasha Mein

  Question: Correct statements for an element with atomic number 9 are: A. There can be 5 electrons for which mₛ = +1/2 and 4 electrons for which mₛ = −1/2. B. There is only one electron in the p₂ orbital. C. The last electron goes to the orbital with n = 2 and l = 1. D. The sum of angular nodes of all the atomic orbitals is 1. 📷 Question Image:

In a first order decomposition reaction, the time taken for the decomposition of reactant to one-fourth and one-eighth of its initial concentration are t₁ and t₂(s) , respectively. The ratio t₁/t₂ will be: 📷 Question Image:

  Atomic Number of the Element with Lowest First Ionisation Enthalpy | JEE Chemistry 📌 Question The atomic number of the element from the following with the lowest first ionisation enthalpy is: 📚 Concept Used – First Ionisation Enthalpy Definition: First ionisation enthalpy is the energy required to remove the most loosely bound electron from an isolated gaseous atom in its ground state. Periodic Trend: Across a period → IE increases (nuclear charge ↑, atomic size ↓) Down a group → IE decreases (atomic size ↑, shielding effect ↑) Lowest IE Element: The element at the bottom-left of the periodic table has the lowest IE, because it has large size and weak nuclear attraction for the outermost electron. 🖋 Solution The element with the lowest first ionisation enthalpy is Francium (Fr) , but in practical chemistry, Cesium (Cs) is often considered because Francium is radioactive and rare . Francium’s atomic number = 87 Therefore, the answer ...

  🎬 VSEPR Theory in 59 Sec — JEE Made Simple! “Bhai shape yaad karne ki tension chhodo — VSEPR theory se har molecule ka shape nikal jaata hai!” JEE ke preparation mein molecules ke shapes yaad karna ek badi headache hoti hai. But chill! Agar tumhe VSEPR Theory sahi se samajh aayi, toh tum khud se har molecule ka shape predict kar sakte ho — bina ratta lagaye! 📚 What is VSEPR Theory? VSEPR ka full form hota hai Valence Shell Electron Pair Repulsion Theory . Yeh theory ye kehti hai ki: "Electron pairs jo central atom ke around hote hain, wo ek dusre ko repel karte hain. Aur molecule apna aisa shape adopt karta hai jahan yeh repulsions minimum ho — yaani most stable shape." Iska matlab — molecular geometry ka pura funda sirf yeh samajhne mein chhupa hai ki electron pairs apas mein kitna door rehna chahte hain. 🔍 Why It Matters in JEE? Har saal JEE Mains aur Advanced dono mein VSEPR based questions aate hain. Questions directly puchhe jaate hain — "S...