19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The oxidation state of C in diamond is
The oxidation number of C in HNC is
An element that never has a positive oxidation state in any of its
Nitrogen show different oxidation states in the range
The oxidation number of xenon is XeOF₂ is
An oxidation process involves
In the neutral or faintly alkaline medium, KMnO₄ oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from (NEET 2022)
Which of the following reactions are disproportionation reactions? (i) 2Cu Cu Cu → (ii) 3MnO 4H 2MnO MnO 2H O → (iii) 2KMnO K MnO MnO O → (iv) 2MnO 3Mn 2H O 5MnO 4H → Select the correct option from the following. (NEE…
In acidic medium, H₂O₂ changes Cr O to CrO₅ which has two (–– O –– O –––) bonds. Oxidation state of Cr in CrO₅ is (AIMPT 2014)
In which of the following compounds, nitrogen exhibits highest oxidation state? (AIPMT 2012)
I 2S O S O 2I → In the above reaction: (CPMT 2009)
When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxide are liberated in equal volumes according to the equation. o xC u yH NO Cu NO NO NO H O → The coefficients x and y are
Balance the following equation and choose the correct value of sum of coefficients of the products: CS Cl CCl S Cl →
In the reaction, → Br₂ + xBrO yCr zH O HCrO H , REDOX REACTIONS the coefficients x, y and z are
For the reaction: NH OCl N H Cl → in basic medium, the coefficients of NH₃,OCl and N₂H₄ for the balanced equation are respectively
In a balanced equation, H SO xHI H S yI zH O → the value of x, y and z are
Which of the following observations is correct and is used in the identification of carboxylic acids?
An organic compound is heated with HNO₂ at 0 °C and then the resulting solution is added to a solution -napthol whereby a brilliant red dye is produced. The observations indicate that the compound possesses.
Phenols contains acidic H it reacts with KOH.
Which of the following statements is wrong?
Sulphur is estimated by Carius method in the form of
Compounds which do not contain halogen but give positive Beilstein test?
Camphor is purified by (Kerala PMT 2014)
An organic compound which produces a bluish green coloured flame on heating in presence of copper is (AIIMS 2014)
Paper chromatography has following mobile and stationary phases respectively (Bihar CECE 2015)