CHEM BRAIN

The right option for mass of CO₂ produced by heating 20g of 20% pure lime is  NEET2023

\( CaCO_3 \rightarrow CaO + CO_2 \) 

1.5 mol of O₂ combine with Mg to form oxide MgO . The mass of Mg (at. mass 24) that has combined is [KCET 2001]

H ₂ evolved at STP on complete reaction of 27 g of Aluminium with excess of aqueous NaOH would be [CPMT 1991]

If \(1 \frac{1}{2} \) moles of oxygen combine with \( Al \)  to form \( Al_2O_3 \)  the weight of \( Al \)  used in the reaction is (Al=27) [EAMCET 1980]

Stoichiometry is NUMS-2021

What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene [CBSE PMT 1989]

Assuming fully decomposed, the volume of CO₂ released at STP on heating 9.85g of BaCO₃ (Atomic mass of Ba=137) will be [CBSE PMT 2000] 

The number of gram molecules of oxygen in 6.02 x10²⁴ CO molecules is 1990

\( 2XeF_6 + SiO_2 \rightarrow 2XeOF_4 + SiF_4 \) 

If 122.6g of XeF₆ reacts with 60g of SiO₂ to form the product. Select the limiting reagent and amount of SiF₄ formed . XeF₆=245.3amu SiO₂= 60amu SiF₄=104amu ETEA2016 Medical qNo28

The volume of CO₂ produced by heating 33.5g Li₂CO₃   at room temprature and pressure. ETEA2018 eng

\( 2KClO_3 \rightarrow KCl + 3O_2 \)    

Molecular mass of KClO₃ =122.5g/mol for the production of 33.6dm³ of O₂  At STP the mass of KClO₃ to be decomposed is.  ETEA-2018-eng

A mixture of 2.3g of formic acid and 4.5g oxalic acid is treated with con.H₂SO₄ . The evolved gaseous mixture is passed through  KOH pellets. Weight of remaining product at STP will be NEET2018

Number of mole of hydrogen molecules required to produce 20mole of ammonia through Haber's process  NEET-2019

How many mole of calcium are present in 1.75Kg of calcium carbonate ? MDCAT2019