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The d-and f-Block Elements

CBSE · Class 12 · Chemistry

Flashcards for The d-and f-Block Elements — CBSE Class 12 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.

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A flowchart detailing the industrial preparation of potassium dichromate, starting from chromite ore and involving fusion, acidification, and conversion steps.
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Card 1संक्रमण धातुओं की परिभाषा

संक्रमण धातुएँ क्या होती हैं?

Answer

संक्रमण धातुएँ वे धातुएँ हैं जिनके उदासीन परमाणु में या उनके किसी आयन में d उपकोशिका अपूर्ण होती है। वे परिवर्ती ऑक्सीकरण अवस्थाएँ, रंगीन आयन, जटिल निर्माण, उत्प्रेरक क्रिया और अनुचुंबकत्व दर्शाते हैं

Card 2Definition of transition metals

What are transition metals?

Answer

Transition metals are metals with an incomplete d subshell in the neutral atom or in one of their ions. They show variable oxidation states, coloured ions, complex formation, catalytic activity, and p

Card 3Transition element classification

Why is scandium a transition element but zinc is not?

Answer

Scandium has an incompletely filled 3d subshell in the ground state, so it is a transition element. Zinc has a completely filled 3d10 configuration in the ground state and in its common oxidation stat

Card 4संक्रमण तत्व वर्गीकरण

स्कैंडियम एक संक्रमण तत्व क्यों है लेकिन जस्ता नहीं है?

Answer

स्कैंडियम का भू-अवस्था में 3d उपकोशिका अधूरा भरा हुआ होता है, अतः यह एक संक्रमण तत्व है। जस्ता का भू-अवस्था में 3d10 पूर्ण भरा हुआ विन्यास होता है और इसकी सामान्य ऑक्सीकरण अवस्था में भी, अतः इसे संक्र

Card 5संक्रमण तत्व वर्गीकरण

जस्ता, कैडमियम और पारा को संक्रमण धातु क्यों नहीं माना जाता है?

Answer

इनकी पूर्ण d10 विन्यास इनकी मूल अवस्था में और इनकी सामान्य ऑक्सीकरण अवस्थाओं में भी होती है। चूँकि परमाणु या आयन में कोई अपूर्ण d उपकोश नहीं होता है, इसलिए ये संक्रमण धातु नहीं हैं।

Card 6Transition element classification

Why are zinc, cadmium, and mercury not regarded as transition metals?

Answer

They have full d10 configuration in their ground state and also in their common oxidation states. Since no incomplete d subshell is present in the atom or ion, they are not transition metals.

Card 7Electronic configuration

What is the general electronic configuration of d-block elements?

Answer

The general outer electronic configuration is (n-1)d1-10 ns1-2. Palladium is an exception with configuration 4d10 5s0. Chromium and copper also show exceptions due to extra stability of half-filled an

Card 8इलेक्ट्रॉनिक विन्यास

डी-ब्लॉक तत्वों का सामान्य इलेक्ट्रॉनिक विन्यास क्या है?

Answer

सामान्य बाह्य इलेक्ट्रॉनिक विन्यास (n-1)d1-10 ns1-2 है। पैलेडियम एक अपवाद है जिसका विन्यास 4d10 5s0 है। अर्ध-भरे और पूर्ण भरे हुए d उपकोशों की अतिरिक्त स्थिरता के कारण क्रोमियम और तांबा भी अपवाद दिखात

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Frequently Asked Questions

What are the important topics in The d-and f-Block Elements for CBSE Class 12 Chemistry?
Key topics in The d-and f-Block Elements include Complete Concept Map: d- and f-Block Elements, Overview of d-Block Transition Elements — Key Characteristics, Is It a Transition Metal? — Decision Flowchart. These are the concepts CBSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in The d-and f-Block Elements — CBSE Class 12 Chemistry?
Understand the core concepts first, then work through the 93 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for The d-and f-Block Elements?
There are 80 flashcards for The d-and f-Block Elements covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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