Last seen: Jan 13, 2022
Compound - Oxidation state of transition element. (i) K2Cr2O7 x = +6 (ii) KMnO4 y = + 7 (iii) K2FeO4 z = + 6 so (x + y ...
Correct answer: (1) X < Y < Z Explanation: On moving left to right in a period. Acidic character of oxides is increase. 3rd period eleme...
Correct answer: (1) Li and Mg Explanation: Li and Mg do not form solid bicarbonate. But react with N2 to give nitrides. 6Li + ΔN2 → 2Li3N 3Mg ...
Correct answer: (3) Formation of red colour Explanation: Seliwanoff reagent → [Resorcinol + Conc. HCl] Use of Seliwanoff reagent is to distingu...
Correct answer: (3) aqueous NaHCO3 Explanation: In toilet cleaning liquid the main constituent is HCl, which can cause skin burn so it should be t...
Correct answer: (4) pentagonal planar and trigonal bipyramidal Explanation: (i) XeF5- → St. No. = (5 + 2) = 7 so hybridisation is = sp3d3 and ...
(1) [Ni(NH3)2Cl2] → N2+ → 3d84s0 → sp3 hybridisition. → tetrahedral. So [Ni(NH3)2Cl2] do not show isomerism. ...
Correct answer: (4) (i) – (a); (ii) – (c); (iii) – (d) Explanation: (i) ion-ion interaction energy is inversely proportional to the distance betwe...
Correct answer: (4) 2 Explanation: For n= 4 possible values of ℓ = 0, 1, 2, 3 only ℓ = 2 & ℓ = 3 can have m = –2. So possible subshells are 2.
Correct answer: (3) Osmosis Explanation: When mango kept in concentrate salt solution then solvent (water) flow from mango to concentrate solution...
Correct answer: (3) (a) and (b) Explanation: (a) When gas is adsorbed on metal surface. ΔH become less negative with progress of reaction. (b) G...
Correct answer: (1) wrought iron and steel Explanation: Cast iron is made from pig iron which is used for production of wrought iron & steel.
Correct answer: (3) tetrahedral and –0.6 Δt Explanation: Since spin only magnetic moment is 4.90 BM so number of unpaired electrons must be 4. so ...
Correct option:(4) Bredig’s Arc Method Explanation: Bredig’s Arc Method is used for preparation of colloidal sol’s of less reactive metal like Au,...
Correct answer:(3) Cs Explanation: Cesium has lowest ionisation enthalpy and hence it can show photoelectric effect to the maximum extent hence it...
Correct answer: (3) leaves the vapour increases Explanation: The vapour pressure of solution will be less than vapour pressure of pure solvent, so...
Correct answer: (2) (l), (ll) and (lll) only Explanation: With weak field ligands Mn(II) will be of high spin and with strong field ligands it wil...
Correct answer: (4) Atomic radius Explanation: On moving Left to Right along a period. Atomic Radius → decreases. Electronegativity → Increase...
Correct answer: (3) Pb(NO3)2 Explanation: (1) Pb(NO3)2 + Δ → PbO + 2NO2 (2) NH4NO2 + Δ → N2 + 2H2O (3) (NH4)2Cr2O7 + Δ → N2 + Cr2O7 + H2O (4...
Correct answer: (3) Bunsen burner and measuring cylinder Explanation: In this acid base titrating there is no use of Bunsen burner and measuring c...