CBSE Class 12 Chemistry The p Block Elements Questions
Consequences : 1. The first element in p-block element has four valence orbitals i.e. one 2s and three 2p, Hence maximum covalency of the first element in limited to four. The other elements of the p-block elements have vacant d-orbitals in their valence shell, e.g. elements…
CBSE Class 12 Chemistry The p Block Elements Assignment
LEVEL-1 QUESTIONS 1. NH3 has higher boiling point than phosphine. Why? Ans—Ammonia is a polar molecule it form in-termolecular hydrogen bonding. 2. Why BiH3 the strongest reducing agent amongst all the hydrides of group 15 elements Ans- Less B.E or longer…
CBSE Class 12 Chemistry The d and f Block Elements Questions
Electronic Configuration of Transition Metal/Ions The d-block element is called transition metal if it has partly filled d-orbitals in the ground state as well as in its oxidised state. The general electronic configuration of transition metal is (n–1) d1–10ns1–2. …
CBSE Class 12 Chemistry The d and f Block Elements Assignment
Q.1-Explain briefly how +2 oxidation states becomes more and more stable in the first half of the first row transition elements with increasing atomic number. Ans.1-In M2+ ions, 3d-orbitals get occupied gradually as the atomic number increases. Since, the number of empty d-…
CBSE Class 12 Chemistry Surface Chemistry Questions
1. Why does a gas mixed with another gas not form a colloidal system? 2. Why are adsorbate particles attracted and retained on the surface of adsorbent? 3. Explain the terms sorption and desorption. 4. “Chemisorption is highly specific.” Illustrate with an example. 5. “…
CBSE Class 12 Chemistry Surface Chemistry Assignment
Question. The adsorption of a gas on a solid surface varies with pressure of the gas in which of the following manner (a) fast → slow → independent of the pressure (b) slow → fast → independent of the pressure (c) independent…
CBSE Class 12 Chemistry Solutions Questions
VSA QUESTIONS (1 - MARK QUESTIONS) 1. Give an example of ‘liquid in solid’ type solution. 2. Which type of solid solution will result by mixing two solid components with large difference in the sizes of their molecules? 3. What is meant by semimolar and decimolar solutions?…
CBSE Class 12 Chemistry Solutions Assignment
LEVEL-1 QUESTIONS 2.1 What are solns? Homogeneous mixture containing two or more than two components. 2.2 What are binary solns? Binary solution : Solutions containing only two components. 2.3.Define mole fraction Ratio of number of moles of a component to the total…
CBSE Class 12 Chemistry Solid State Questions
VSA QUESTIONS (1 - MARK QUESTIONS) 1. What are anistropic substances. 2. Why are amorphous solids isotropic in nature? 3. Why glass is regarded as an amorphous solid? 4. Define the term 'crystal lattice.’ 8. Define the term voids. 9. What type of stochiometric…
CBSE Class 12 Chemistry Solid State Assignment
Level-1 QUESTIONS 1 Why are solids rigid? Because the particles have fixed positions and can oscillate only about their mean position only. 2 Why do solids have a definite volume? The particles of solid have fixed positions and…
CBSE Class 12 Chemistry Polymers Questions
Points to Remember 1. Polymers are defined as high molecular mass macromolecules which consist of repeating structural units derived from the appropriate monomers. 2. In presence of an organic peroxide initiator, the alkenes and their derivatives undergo addition…
CBSE Class 12 Chemistry Polymers Assignment
COAL, PETROLEUM AND POLYMERS Question. When formaldehyde is heated with phenol in the presence of an alkali, the product formed is - (A) rubber (B) bakelite (C) chloroprene (D) neoprene Answer. B Question. Synthetic fibres are obtained from - (A) plants (B) animals (C)…
CBSE Class 12 Chemistry Organic Chemistry Questions
9. In case of optically active alkyl halide, SN2 mechanism results in the inversion of configuration while SN1 mechanism in racemisation. 10. Aryl halides are much less reactive towards nucleopillic substitution reactions. Presence of electron withdrawing groups (like –NO2…
CBSE Class 12 Chemistry Halo Alkanes and Halo arenes Questions
SHORT ANSWER TYPE QUESTIONS Question. Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN forms isocyanides as the chief product. Explain. Answer. KCN is predominantly ionic and provides cyanide ions in solution. Both carbon and nitrogen atoms…
CBSE Class 12 Chemistry Halo Alkanes and Halo arenes Assignment
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