19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
What is the volume of “20 volume H2O2” required to get 5000 cm3 of oxygen at STP ?
The volume of oxygen liberated from 15 mL of 20 volume H2O2 is
A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly
Assertion: Increasing pressure on pure water decreases its freezing point. Reason: Density of water is maximum at 4° C.
Assertion: Among the two OH bonds in H2O molecule, the energy required to break the first OH bond and the other OH bond is same. Reason: This is because the electronic environment around oxygen is the same even after …
Assertion: Permanent hardness of water can be removed by using washing soda. Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates.
Assertion: Anhydrous BaO2 (barium peroxide) is used for preparing H2O2. Reason: Hydrated BaO2 is not available.
Assertion: In alkaline medium, H2O2 reacts with potassium ferricyanide. Reason : H2O2 is a strong reducing agent.
When hydrochloric acid gas is treated with propene in presence of benzoyl peroxide, it gives.
The reagent is Reagent R CH CCl R R C C R ->
Consider the following statements : A hydrocarbon of molecular formula C5H10 is a I. monosubstituted alkene II. disubstituted alkene III. trisubstituted alkene Which of the following statement(s) is(are) correct?
Which one of the following reactions is expected to readily give a hydrocarbon product in good yields? (a) Electrolytic RCOOK oxidation -> (b) Br2 RCOO Ag -> (c) Br2 RCOO Ag ->
In the given reactions : Br Na,ether Na,ether (i)CH Br X Y Z hv Br NaOH NaOH (ii)CH COOH X Y Z CaO hv -> -> -> -> -> -> Identify X, Y and Z. X Y Z
Match the column I with column II and mark the appropriate choice. Column I Column II (A) n-butane 2-methylpropane (i) Free radical substitution (B) hv CH Cl CH Cl -> (ii) Wurtz reaction (C) RCOONa + soda lime RH (…
Which of the following statements is true ?
Consider the below reaction and identify the missing reagent/chemical (NEET 2021) + NaOH + ? CH CH COO Na Heat CH CH Na CO ->
The major product formed in dehydrohalogenation reaction of 2-Bromopentane is pent-2-ene. This product formation is based on (NEET 2021)
The major product of the following chemical reaction is (NEET 2021) (a) (b) (c) (d)
An alkene A on reaction with O3 and Zn–H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene A gives B as the major product. The structure of product B is (NEET 2020) (a) (b) (c) (d)
An alkene on ozonlysis gives methanal as one of the product. Its structure is (NEET 2020) (a) (b) (c) (d)
Which of the following alkane cannot be made in good yield by Wurtz reaction? (NEET 2020)
Among the following the reaction that proceeds through an electrophilic substitution is (NEET 2019) (a) (b) (c) (d)
In the following reaction, red hot iron tube 873K H C C CH A -> The number of sigma () bonds present in the product A, is (NEET 2019)
The most suitable reagent for the following conversion, is (NEET 2019) (a) Hg / H ,H O
The alkane that gives only one monochloro product on chlorination with Cl2 in presence of diffused sunlight is (NEET 2019)