Question 11 Mark

(1) The separation of $H$ and $Cl$ in $HCl$ is in absence of water.
(2) $NaOH _{( s )} \frac{\text { Water }}{\text { dissociation }}> Na _{( aq )}^{+}+ OH _{( aq )}^{-}$
(3) $H _2 SO _4$ is a strong acid.
(4) $NaC 1$ is an ionic compound.
(5) Turmeric is synthetic indicator.
(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.

Answer

(1) False. The separation of $H ^{+}$and $Cl ^{-}$in $HC 1$ is in presence of water.
(2) True
(3) True
(4) True
(5) False. Turmeric is a natural indicator.
(6) False. Metal + Dilute acid forms salt and hydrogen gas.
(7) False. Iron oxide is called red primer.
(8) False. Oxide of izan-metal + Base $\rightarrow$ Salt + Wafer.
(9) True
(10) True
(11) False. Blue Vitriol is $CuSO _4 .5 H _2 O$.
(12) False. Molecular formula for crystalline Ferrous sulphate is $FeSO _4 \cdot 7 H _2 O$.
(13) False. $NaCl$ in water conducts electricity.
(14) False, Phenolphthalein is colourless in acid and pink in base.

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