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Substances in Common Use — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceSubstances in Common Use1 Mark
Question
Sodium chloride is formed by neutralization reaction between sodium hydroxide and calcium carbonate.
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Answer

False. Sodium chloride is formed by a neutralization reaction between sodium hydroxide and hydrochloric acid.

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(1) The separation of $H$ and $Cl$ in $HCl$ is in absence of water.
(2) $NaOH _{( s )} \frac{\text { Water }}{\text { dissociation }}> Na _{( aq )}^{+}+ OH _{( aq )}^{-}$
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(6) Metal + Dilute acid forms salt and water.
(7) Copper oxide is called red primer.
(8) Oxide of non-metal + Acid $\rightarrow$ Salt + Water.
(9) Zinc oxide reacts with sodium hydroxide to form sodium zincate.
(10) $Al _2 O _3$ is an amphoteric oxide.
(11) Blue vitriol $ZnSO _4$. $7 H _2 O$.
(12) Molecular formula for crystalline Ferrous sulphate is $Fe 5 O _4 \cdot 5 H _2 O$.
(13) $NaCl$ in water does not conduct electricity.
(14) Phenolphthalein is colourless in base.
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