List of practice Questions

If 12²θ-31θ+32=0, then the value of θ is
\tan20^+\tan40^+√(3)\tan20^\tan40^ is equal to
The roots of the equation x²-2√(2)x+1=0 are
If 1-iα1+iα=A+iB, then A²+B² equals
Formic acid and acetic acid can be distinguished by
When ethylamine reacts with sodium metal, the gas evolved is
The secondary structure of a protein refers to
When H₂S gas is passed through the HCl containing aqueous solution of CuCl₂, HgCl₂, BiCl₃ and CoCl₂, it does not precipitate out
Which one of the following statements is correct?
Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. HCl solution and one formed a black precipitate with H₂S. The salt could be
The correct order of reactivity of halogens with alkalis is
In the manufacture of iron from haematite, limestone is added to act as
Which of the following has square planar geometry?
In which of the following conversions, phosphorus pentachloride is used as the reagent?
Match List I (Reaction) with List II (Reagent) and select the correct answer. arrayl l List I & List II
I. Etard reaction & A. Alcoholic KOH
II. Hydroxylation & B. Anhydrous AlCl₃
III. Dehydrohalogenation & C. Chromyl chloride
IV. Friedel–Crafts reaction & D. Dilute alkaline KMnO₄ array
Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?
Phosphate pollution is caused by
Eutrophication causes reduction in
Coolant used in radiator is aqueous solution of ethylene glycol. In order to prevent the solution from freezing at -0.3C, how much ethylene glycol must be added to 5 kg of water? (Kf = 1.86K kg mol⁻¹)
Which of the following will form the cathode with respect to iron an electrode cell?
The activation energy for a simple chemical reaction A → B is Eₐ in the forward direction. The activation energy for reverse reaction
The following data are for the decomposition of ammonium nitrite in aqueous solution: arrayc c Vol. of N₂ in cc & Time (min)
6.25 & 10
9.00 & 15
11.40 & 20
13.65 & 25
35.65 & ∞ array The order of reaction is:
Which liberates ammonia when treated with water?
Liebig’s method is used for the estimation of
Hyperconjugation involves