when silica is heated with Na²CO³ we get which on cooling gives a glassy mass known as because it is in water. option -->( carbon dioxide , glass, in soluble), ( sodium silicate, water glass, in soluble),( sodium silicate, water glass, soluble ), carbon dioxide, glass, soluble)

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

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explanation:

a