Download App

p-Block Elements – I — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12Chemistryp-Block Elements – I5 Marks
Question
Complete the reaction.
(i) $H _3 BO _3 \stackrel{373 K }{\longrightarrow} A + H _2 O$
(ii) $A \stackrel{413 K }{\longrightarrow} B + H _2 O$
(iii) $B \stackrel{\text { Red hot }}{\longrightarrow} C + H _2 O$
✓

Answer

Boric acid when heated at 373 K gives metaboric acid (A) and A heated at 413 K it gives tetraboric acid (B). B heated at red hot it gives boric anhydride (C).
Image

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[ 5 Marks Questions ]" from p-Block Elements – I→p-Block Elements – I — all question types→Chemistry STD 12 question papers→Tamilnadu Board STD 12 question papers→Tamilnadu Board question paper generator→

Similar questions

What is enzyme catalysis? Give the characteristics of enzyme catalysed reaction?
→
Explain the reaction of metals with nitric acid.
→
A substance reacts according to the first order rate law and the specific reaction rate for the reaction ¡s $1 \times 10^{-2} s^{-1}$ If the initial concentration is 1.0 M.
  1. What is the initial rate?
  2. What ¡s the reaction rate after 1 minute?
→
A compound 'A' of molecular formula $C _3 H _7 O _2 N$ on reaction with Fe and cone. HCl gives a compound ' B ' of molecular formula $C _3 H _9 N$. Compound ' B ' on treatment with $NaNO _2$ and HCl gives another compound ' C ' of molecular formula $C _3 H _8 O$. The compound ' C ' has a molecular formula, $C _3 H _8 O$. The compound ' C ' gives effervescence with Na . On oxidation with $CrO _3$, the compound ' C ' gives a saturated aldehyde containing three carbon atoms. Deduce the structures of A , B , and C and write the equations for the reaction involved.
→
Describe the construction of Daniel cell. Write the cell reaction.
→
Explain
  1. Perkin’s reaction
  2. Knocvenagal reaction.
→
Describe about lithium-ion battery and its uses.
→
 A simplest aromatic hydrocarbon (A) reacts with methyl chloride in the presence of $AlCl _3$ gives (B) $C _7 H _8$. Compound (B) reacts with $Br _2$ along with light gives (C) of molecular formula $C _7 H _7 Br (C)$ reacts with alcohol KCN gives ( D ) $\left( C _8 H _7 N\right.$ ) ( D ) on acid hydrolysis gives ( E ) of formula $C _8 H _8 O _2$. Identify $A , B , C , D , E$ and explain the reactions involved.
→
QuEstoN An aromatic hydrocarbon (A) of molecular formula $C _6 H _6$ reacts with Conc. $HNO _3$ and Conc. $H _2 SO _4$ gives (B) of formula $C _6 H _5 O _2 N$. (B) on reaction with $Sn / HCl$ gives (C) of formula $C _6 H _7 N$ which answers carbylamine reaction. (C) on treatment with chloroform and alkali gives (D) of formula $C _7 H _5 N$. Identify $A , B , C , D$ and explain the reactions involved.
→
An aromatic compound ' $A$ ' of molecular formula $C _7 H _7 ON$ undergoes a series of reactions as shown below. Write the structures of $A, B, C, D$ and $E$ in the following reactions.
Image
→