19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
In the reaction, 2IO xSO 4H O 5SO 8H I → The coefficient of SO₂ in balanced equation is
In the redox reaction, xKMnO NH yKNO MnO KOH H O → x and y are
In the following redox equation, 2+ 2- + 2+ 3+ 2 7 xUO +Cr O +yH aUO +zCr +bH O → the value of coefficients x, y and z respectively, are
In the balanced chemical reaction IO aI bH cH O dI → a, b, c and d respectively, correspond to
aK Cr O bKCl cH SO → xCrO Cl yKHSO zH O The above equation balances when
In the chemical reaction, K₂Cr₂O₇ + XH₂SO₄ + YSO₂ → K₂SO₄ + Cr₂(SO₄)₃ + ZH₂O, X, Y and Z are
For the redox reaction MnO₄– + C₂O₄₂– + H⁺ → Mn²⁺ + CO₂ + H₂O, The correct stoichiometric coefficients of MnO₄– , C₂O₄₂– and H⁺ are respectively:
Which of the following reaction is balanced? (a) AsO MnO AsO MnO 2H O → (b) MnO C O Mn CO → (c) 3 2 Cu 4HNO Cu(NO ) 2NO 2H O → (d) H S HNO H O NO S → Ans (c) Sol. In option (a), 2- - 3- AsO +MnO AsO +MnO +2H O → The n…
What is the stoichiometric coefficient of Ca in the reaction? Ca Al Ca Al →
Phenols contains acidic H it reacts with KOH.
Which of the following observations is correct and is used in the identification of carboxylic acids?
Paper chromatography is an example of : (NEET 2020)
To separate a mixture of amines from each other, one should follow:
In the Lassaigne’s test for the detection of nitrogen in the organic compound, the appearance of blue coloured compound is (West Bengal PMT 2015)
The most suitable method of separation of 1: 1 mixture of ortho and para-nitrophenols is (NEET 2017)
An organic compound which produces a bluish green coloured flame on heating in presence of copper is (AIIMS 2014)