Question
What are enzymes?
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Answer
Enzymes are globular proteins which are biological catalysts. They are highly specific in their action.
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Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous.
→- Tetra phosphorus decoxide $(P_4O_{10})$
- Ammonium phosphate $(NH_4)_3PO_4$
- SiC
- $I_2$
- $P_4$
- Plastic
- Graphite
- Brass
- Rb
- LiBr
- Si
What happens when:
→- $PCl_5$ is heated?
- $H_3PO_3$ is heated?
When 3-methylbutan-2-ol is treated with HBr, the following reaction takes place:$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Br}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}-\text{CH}-\text{CH}_3\xrightarrow{\ \ \ \text{HBr} \ \ }\text{CH}_3-\text{C}-\text{CH}_2-\text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\ \ \ \ \text{OH}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
Give a mechanism for this reaction.
(Hint: The secondary carbocation formed in step II rearranges to a more stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.)
→Give a mechanism for this reaction.
(Hint: The secondary carbocation formed in step II rearranges to a more stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.)
- Name the method used for removing gangue from sulphide ores.
- How is wrought iron different from steel?
Why do gases always tend to be less soluble in liquids as the temperature is raised?
- State the IUPAC name of the following compound:
- Complete the following chemical equation:
How is copper extracted from low grade copper ores?
When $MnO_2$ is fused with $KOH$ in the presence of $KNO_3$ as an oxidizing agent, it gives a dark green compound $(A).$ Compound $(A)$ disproportionates in acidic solution to give purple compound $(B).$ An alkaline solution of compound $(B)$ oxidises KI to compound $(C)$ whereas an acidified solution of compound $(B)$ oxidises $KI$ to $(D).$ Identify $(A),\ (B),\ (C)$, and $(D).$
→Write the name of monomers used for getting the following polymers:
- Teflon.
- Buna-N.
Cell $Z n _{( s )}\left| Z n _{( aq )}^{2+} \| C u _{( aq )}^{+ 2 }\right| C u _{( s )}$. The value of cell potential for $Cu ( s )$ is positive. What conclusion is drawn from this?
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