Mole concept and Stoichiometry — Chemistry STD 10 — Question

For the initial condition, if the gas constant (R=0.0821), the initial number of moles of nitrogen gas using the ideal gas law (PV = nRT) is ________ (1/0.244/2) moles.

The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is __________.

Methane can be prepared by heating _______ with solid _______ .

When sodium chloride is heated with concentrated sulphuric acid below 200°C, one of the products formed is ________. [sodium hydrogen sulphate/sodium sulphate/chlorine]

Heating ammonium chloride with sodium hydroxide produces ______ (ammonia, nitrogen)

In the formation of calcium oxide, the oxygen atom gains two electrons in its valence shell and hence is ________. (oxidised/reduced)

The metal plate trough which current enters into an electrolyte is called ___________. It has ____________ of electrons.

Metal A reacts with cold water forming hydrogen and new compound B. The anion combined with A in a substance B is named __________.

The metal other than aluminium present in duralumin is _______ .

When dilute sulphuric acid is treated with CaOCl₂, the colour of the gas evolved is ________ . [greenish/yellow brown].