Nmdcat Practice Paper from PMDC Syllabus | mosaicbro.com

Nmdcat Practice Paper from PMDC Syllabus

7 of 197 questions (Page 11 of 29)

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71 What is the minimum temperature required to prepare formaldehyde in the laboratory?
Correct Answer: A
Explanation: Formaldehyde (HCHO) is produced by passing methanol vapors over a Cu catalyst at 500°C.
72 Calcium formate on heating gives:
Correct Answer: D
Explanation: Heating calcium formate [(HCOO)₂Ca] yields formaldehyde (HCHO) and calcium carbonate (CaCO₃).
73 Which of the following reaction is used for the separation and purification of carbonyl compounds from non-carbonyl compounds?
Correct Answer: C
Explanation: Sodium bisulfite (NaHSO₃) forms crystalline adducts with aldehydes/ketones, aiding purification.
74 Tollen's reagent is:
Correct Answer: C
Explanation: Tollen's reagent ([Ag(NH₃)₂]⁺) oxidizes aldehydes to carboxylates, depositing a silver mirror.
75 The class of compounds that are reduced to primary alcohols and respond to Fehling's solution are known as:
Correct Answer: C
Explanation: Aliphatic aldehydes (e.g., acetaldehyde) reduce Fehling's solution (Cu²⁺ → Cu⁺) and form primary alcohols.
76 Ketones on oxidation produce acids of:
Correct Answer: A
Explanation: Ketone oxidation cleaves the C-C bond, yielding smaller carboxylic acids (e.g., acetone → acetic acid).
77 One of the following compounds does not have α-hydrogen. Which is that?
Correct Answer: C
Explanation: Formaldehyde (HCHO) lacks α-hydrogens (no carbons adjacent to the carbonyl group).
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