Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Hair shampoos belong to which class of synthetic detergent?

Dishwashing soaps are synthetic detergents. What is their chemical nature?

Draw the diagram showing micelle formation by the following detergent.

\[\ce{CH3(CH2)10CH2OS\overset{-}{O}3\overset{+}{N}a}\]

How does the branching of hydrocarbon chain of synthetic detergents affect their biodegradability?

Match structures given in Column I with the type of detergents given in Column II.

Synthetic detergents have advantage over usual soaps as far as cleansing power is concerned. But use of synthetic detergents over a long time creates environmental pollution. How can the pollution caused by synthetic detergents be minimised? Classify the detergents according to their chemical nature.

Convert the following: 

Propanenitrile to ethanol.

In a coordination entity, the electronic configuration of the central metal ion is t_2g³ e_g¹

Is the coordination compound a high spin or low spin complex?

What is the no. of possible isomers for the octahedral complex [Co(NH₃)₂(C₂O₄)₂]?

Which of the following tests/reactions is given by aldehydes as well as ketones?

Using Valence bond theory, explain the following in relation to the paramagnetic complex [Mn(CN)₆]³⁻ 

1. type of hybridization
2. magnetic moment value
3. type of complex – inner, outer orbital complex

Give reasons for the following observation:

Primary amine on treatment with benzenesulphonyl chloride forms a product which is soluble in NaOH however secondary amine gives product which is insoluble in NaOH.

What is the quantity of electricity in Coulombs required to produce 4.8 g of Mg from molten MgCl₂? How much Ca will be produced if the same amount of electricity was passed through molten CaCl₂? (Atomic mass of Mg = 24 u, atomic mass of Ca = 40 u).

A hydrocarbon (A) with molecular formula C₅H₁₀ on ozonolysis gives two products (B) and (C). Both (B) and (C) give a yellow precipitate when heated with iodine in presence of NaOH while only (B) give a silver mirror on reaction with Tollen’s reagent.

1. Identify (A), (B) and (C).
2. Write the reaction of B with Tollen’s reagent.
3. Write the equation for iodoform test for C.
4. Write down the equation for aldol condensation reaction of B and C.

Write chemical test to distinguish between the following compounds:

Phenol and Benzoic acid

A primary amine 'A' C₂H₇N reacts with alkyl halide (C₂H₅l) to give secondary amine 'B'. 'B' reacts with C₆H₅SO₂Cl to give a solid 'C' which is insoluble in alkali. Identify 'A', 'B', 'C' and write all the chemical reaction involved.

Using valence bond theory, predict the hybridization and magnetic character of the following:

[CoF₆]^3– [Atomic number of Co = 27]

What is the composition of Fehling's reagent?

Write the hybridisation and magnetic behaviour of [CoF₆]³⁻.

[Given: Atomic number of Co = 27]

The reagent that can be used to distinguish acetophenone and benzophenone is ______.