19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
A metal (M) produces a gas (N) on reaction with alkalis like NaOH and KOH. Same gas is produced when the metals react with dilute sulphuric acid. Gas (N) reacts with another toxic gas (P) to form methanol at high temp…
Which of the following reaction produces hydrogen?
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?
Phosphorus cannot form PH₅ with its outer electronic configuration as 3s2, 3p3 because
Which of the statements given below are true for the water molecule structure? (i) Oxygen undergoes sp3hybridisation. (ii) Due to presence of two lone pairs of electrons on oxygen the H–O–H bonds angle is 118.4°. (iii…
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?
Which of the following cannot be used as a test for H₂O₂ ?
Blackened oil painting can be restored into original form by the action of
Which of the following equation depicts reducing nature of H₂O₂?
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.
H₂O₂ is obtained by which of the following?
When zeolite (hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with
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 (…
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Syngas (i) Na₆P₆O₁₈ (B) Calgon (ii) NaAlSiO₄ (C) Permutit (iii) CO + H₂ (D) Producer gas (iv) CO + N₂
Match the reaction of column I with their types given in column II and mark the appropriate choice. Column I Column II (A) H O NH NH OH (i) Self ionisation of H₂O (B) FeCl 3H O → Fe(OH) 3HCl (ii) Decomposition (C) H O…
Study the following reactions and mark the correct properties shown by water. (i) SO₃ + H₂O → H₂SO₄ (ii) Cl₂O₇ + H₂O →2HClO₄ (iii) CaO + H₂O →Ca(OH)₂ (iv) Na₂O + H₂O →2NaOH