During the borax bead test with $$\mathrm{CuS}{\mathrm{O}}_4$$, a blue green colour of the bead was observed in oxidising flame due to the formation of :

"A" obtained by Ostwald's method involving air oxidation of NH$${}_3$$, upon further air oxidation produces "B", "B" on hydration forms an oxoacid of Nitrogen along with evolution of "A". The oxoacid also produces "A" and gives positive brown ring test. Identify A and B, respectively :

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Carbon forms two important oxides - CO and CO$${}_2$$. CO is neutral whereas CO$${}_2$$ is acidic in nature Reason R : CO$${}_2$$ can combine with water in a limited way to form carbonic acid, while CO is sparingly soluble in water In the light of the above statements, choose the most appropriate answer from the options given below :

A. Ammonium salts produce haze in atmosphere. B. Ozone gets produced when atmospheric oxygen reacts with chlorine radicals. C. Polychlorinated biphenyls act as cleansing solvents. D. 'Blue baby' syndrome occurs due to the presence of excess of sulphate ions in water. Choose the correct answer from the options given below :

Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from :

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid. [A] and [B] are respectively :

Compound A reacts with NH$${}_4$$Cl and forms a compound B. Compound B reacts with H$${}_2$$O and excess of CO$${}_2$$ to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A, B and C, are respectively :

$${\mathrm{K}}_2\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_7$$ paper acidified with dilute $${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$$ turns green when exposed to :

Which of the Phosphorus oxoacid can create silver mirror from $$\mathrm{AgN}{\mathrm{O}}_3$$ solution?

During water-gas shift reaction

For a good quality cement, the ratio of silica to alumina is found to be :

The correct group of halide ions which can be oxidised by oxygen in acidic medium is :

The covalency and oxidation state respectively of boron in $${\left[{\mathrm{BF}}_4\right]}^{-}$$, are :

The incorrect statement from the following for borazine is :

Given below are two statements : Statement I : Boron is extremely hard indicating its high lattice energy. Statement II : Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements : Statement I : $${\mathrm{SbCl}}_5$$ is more covalent than $${\mathrm{SbCl}}_3$$ Statement II: The higher oxides of halogens also tend to be more stable than the lower ones. In the light of the above statements, choose the most appropriate answer from the options given below :

Which one of the following pairs is an example of polar molecular solids?

One mole of $${\mathrm{P}}_4$$ reacts with 8 moles of $${\mathrm{SOCl}}_2$$ to give 4 moles of $$\mathrm{A},x$$ mole of $${\mathrm{SO}}_2$$ and 2 moles of $$\mathrm{B}.\mathrm{A},\mathrm{B}$$ and $$x$$ respectively are :

For compound having the formula $${\mathrm{GaAlCl}}_4$$, the correct option from the following is :

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} LIST I Name of reaction LIST II Reagent used A. Hell-Volhard-Zelinsky reaction I. $$NaOH+I_2$$ B. Iodoform reaction II. (i) $$Cr{O}_{2}C{l}_2,C{S}_2$$ (ii) $$H_{2}O$$ C. Etard reaction III. (i) $$B{r}_2$$ / red phosphorus (ii) $$H_{2}O$$ D. Gatterman-Koch reaction IV. $$CO,HCl,$$, anhyd. $$AlC{l}_3$$ Choose the correct answer from the options given below: