Which of the proteins in coronavirus is responsible for attachment to host cell?
Show Hint
- \( \text{Spike} \)
- \( \text{Membrane} \)
- \( \text{Envelope} \)
- \( \text{Nucleocapsid} \)
The Correct Option is A
Solution and Explanation
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Given below are two statements:
Statement I: In the oxalic acid vs KMnO$_4$ (in the presence of dil H$_2$SO$_4$) titration the solution needs to be heated initially to 60°C, but no heating is required in Ferrous ammonium sulphate (FAS) vs KMnO$_4$ titration (in the presence of dil H$_2$SO$_4$).
Statement II: In oxalic acid vs KMnO$_4$ titration, the initial formation of MnSO$_4$ takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs KMnO$_4$, heating oxidizes Fe$^{2+}$ into Fe$^{3+}$ by oxygen of air and error may be introduced in the experiment.
In the light of the above statements, choose the correct answer from the options given below:
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Kjeldahl's method cannot be used for the estimation of nitrogen in which compound?
(A) (B) (C) (D) NH2-CH2-COOH C6H5-NH2 C6H5-N=N-C6H5 O2N-C6H4-NO2 - WBJEE - 2025
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