CaO does not react with 1) SiO2 2) P4O10 3) CO2 4) Mg

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P_{4} O_{10}

on reacting with water does not form :

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Barium reacts vigorously even with cold water while Mg reacts slowly with warm water. Mg does not react with cold water easily while Beryllium does not react even with boiling water.

Q. Identify the correct statement from the following.
(a) On commercial scale,

C O_{2}

is obtained by heating limestone.
(b) Graphite is used as a dry lubricant.
(c)

S i O_{2}

reacts with

H F

but does not react with

N a O H

.
(d) In

[G e C l_{6}]^{2 -}

, the hybridisation of central atom is

s p^{3} d^{2}

Answer the following:

(1) How do metal carbonates react with acids?

(2) Explain in detail about hydronium ion.

(3) What is universal indicator? Does Mg(OH)₂ react with sodium hydroxide? If not, why?

(4) State applications of baking soda.

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