When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?

What is the mass ratio of ethylene glycol ($${\mathrm{C}}_2{\mathrm{H}}_6{\mathrm{O}}_2$$, molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution?

'25 volume' hydrogen peroxide means

A metal chloride contains $$55.0\%$$ of chlorine by weight . $$100\mathrm{mL}$$ vapours of the metal chloride at STP weigh $$0.57\mathrm{g}$$. The molecular formula of the metal chloride is (Given: Atomic mass of chlorine is $$35.5\mathrm{u}$$)

A solution is prepared by adding $$2\mathrm{g}$$ of "$$\mathrm{X}$$" to 1 mole of water. Mass percent of "$$\mathrm{X}$$" in the solution is :

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$ Assertion A : $$3.1500\mathrm{g}$$ of hydrated oxalic acid dissolved in water to make $$250.0\mathrm{mL}$$ solution will result in $$0.1\mathrm{M}$$ oxalic acid solution. Reason $$\mathbf{R}$$ : Molar mass of hydrated oxalic acid is $$126\mathrm{g}{\mathrm{mol}}^{-1}$$ In the light of the above statements, choose the correct answer from the options given below.

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} List - I List - II ($${\Delta }_0$$) A. 16 g of $$\mathrm{C}{\mathrm{H}}_4(\mathrm{g})$$ I. Weighs 28 g B. 1 g of $${\mathrm{H}}_2(\mathrm{g})$$ II. $$60.2\times 10^{23}$$ electrons C. 1 mole of $${\mathrm{N}}_2(\mathrm{g})$$ III. Weighs 32 g D. 0.5 mol of $$\mathrm{S}{\mathrm{O}}_2(\mathrm{g})$$ IV. Occupies 11.4 L volume of STP Choose the correct answer from the options given below:

The number of molecules and moles in 2.8375 litres of O$${}_2$$ at STP are respectively

Which of the following have same number of significant figures? A. 0.00253 B. 1.0003 C. 15.0 D. 163 Choose the correct answer from the options given below

The volume of $$0.02\mathrm{M}$$ aqueous $$\mathrm{HBr}$$ required to neutralize $$10.0\mathrm{mL}$$ of $$0.01\mathrm{M}$$ aqueous $$\mathrm{Ba}(\mathrm{OH}{)}_2$$ is (Assume complete neutralization)

Which one of the following statements is incorrect?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature. Reason R: CO tends to get decomposed at higher temperature. In the light of the above statements, choose the correct answer from the options given below

The methods NOT involved in concentration of ore are A. Liquation B. Leaching C. Electrolysis D. Hydraulic washing E. Froth floatation Choose the correct answer from the options given below :

Given below are two statements: Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode. Statement II: During the Hall-Heroult electrolysis process, purified ${\mathrm{Al}}_2{\mathrm{O}}_3$ is mixed with ${\mathrm{Na}}_3{\mathrm{AlF}}_6$ to lower the melting point of the mixture. In the light of the above statements, choose the most appropriate answer from the options given below:

In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

The major component of which of the following ore is sulphide based mineral?

The reaction representing the Mond process for metal refining is _________.

Given below are two statements : Statement I : In froth floatation method of rotating paddle agitates the mixture to drive air out of it. Statement II : Iron pyrites and generally avoided for extraction of iron due to environmental reasons. In the light of the above statements, choose the correct answer from the options given below :

Which one of the following reactions does not occur during extraction of copper?

The metal which is extracted by oxidation and subsequent reduction from its ore is :