Chemical equations and stoichiometry

1 gram of sodium hydroxide was treated with 25 mL of 0.75 M HCl solution, the mass of sodium hydroxide left unreacted is equal to

The right option for the mass of CO\(_2\) produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40)

\(\mathrm{CaCO_3 \xrightarrow{1200\ K} CaO + CO_2}\)

Which amongst the following options is correct graphical representation of Boyle's Law?

(1) P vs T, straight lines through origin labelled V\(_1\), V\(_2\), V\(_3\) with V\(_1\)<V\(_2\)<V\(_3\); (2) P vs V, hyperbolas labelled T\(_1\), T\(_2\), T\(_3\) with T\(_3\)>T\(_2\)>T\(_1\); (3) P vs 1/V, straight lines labelled T\(_3\), T\(_2\), T\(_1\) with T\(_3\)>T\(_2\)>T\(_1\); (4) P vs 1/V, hyperbolic curves labelled T\(_3\), T\(_2\), T\(_1\) with T\(_3\)>T\(_2\)>T\(_1\).

What mass of 95% pure \(CaCO_3\) will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction ?

\(CaCO_{3(s)} + 2HCl_{(aq)} \to CaCl_{2(aq)} + CO_{2(g)} + 2H_2O_{(l)}\)

[Calculate upto second place of decimal point]

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is :