19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
What will be the mass of oxygen liberated by decomposition of 200 mL hydrogen peroxide solution with a strength of 34 g per litre ?
Choose the correct statement about the given figures.
Hydrogen can be prepared by the action of dil. H₂SO₄ on
Assertion: In alkaline medium, H₂O₂ reacts with potassium ferricyanide. Reason : H₂O₂ is a strong reducing agent.
Assertion: Anhydrous BaO₂ (barium peroxide) is used for preparing H₂O₂. Reason: Hydrated BaO₂ is not available.
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: 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: Increasing pressure on pure water decreases its freezing point. Reason: Density of water is maximum at 4° C.
A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly
The volume of oxygen liberated from 15 mL of 20 volume H₂O₂ is
What is the volume of “20 volume H₂O₂” required to get 5000 cm3 of oxygen at STP ?
Which of the following equation depicts reducing nature of H₂O₂?
Blackened oil painting can be restored into original form by the action of
Which of the following cannot be used as a test for H₂O₂ ?
H₂O₂ is obtained by which of the following?
Consider the following statements: 1. Atomic hydrogen is obtained by passing hydrogen through an electric arc. 2. Hydrogen gas will not reduce heated aluminium oxide. 3. Finely divided palladium absorbs large volume o…
Which of the following is not correct regarding the electrolytic preparation of H₂O₂?
When zeolite (hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with
Which of the following reactions is not used in preparation or deuterium compounds using heavy water?
The molecular formula of a commercial resin used for exchanging ions in water softening is C₈H₇SO₃Na (Mol. wt. 206). What would be the maximum uptake of Ca²⁺ ions by the resin when expressed in mole per gram resin?
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Clark’s method (i) Na₆P₆O₁₈ (B) Calgon’s method (ii) NaAlSiO₄ (C) Ion-exchange method (iii) RSO₃H (D) Synthetic resins method (…
During hydrate formation from aqueous solution, water can be associated in different forms. Indicate the wrong combination. (i) Coordinated water – [Cr(H₂O)₆]3+ 3Cl– (ii) Interstitial water – BaCl₂.2H₂O (iii) Hydrogen…
Product The main product is (a) (b) (c) (d)
Select the true statement about benzene amongst the following
Assertion: Friedel-Craft’s reaction is used to introduce an alkyl or acyl group in the benzene nucleus. Reason: Benzene is a solvent for Friedel-Craft’s alkylation of bromobenzene.