NCERT Lab Manual XV — task. Science CBSE, Class 10.

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Answer the following questions:

1. The reaction between \(HC\)l and \(NaOH\) in its simplified version is \(H^+\)(aq) + \(OH^–\)(aq) → \(H_2O\)(l) can you assign a plausible explanation as to why the reaction should be exothermic?

Because of electrostatic attraction between \(HCl\) and \(NaOH\), try to balance each other.
Because of atomic attraction between \(HCl\) and \(NaOH\), try to balance each other.
Because of non-metallic attraction between \(HCl\) and \(NaOH\), try to balance each other.
Because of ionic attraction between \(HCl\) and \(NaOH\), try to balance each other.

2. Consider the changes; \(2Mg\)(s)+ \(O_2\)(g) → \(2MgO\)(s). Which according to you is exothermic change?

This is hydrothermic reaction.
This is exothermic reaction.
This is endothermic reaction.
This is photothermic reaction.

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91. NCERT Lab Manual XV

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