BCECE 2026 Chemistry Question Paper with Solution PDF is available for download here. The BCECE 2026 exam was conducted on May 30, 2026, in offline mode for subject combinations PCM, PCB, and PCA at various exam centres across Bihar.
The BCECE 2026 Chemistry question paper consisted of 100 objective-type questions, to be completed in 90 minutes, carrying a total of 400 marks.
BCECE 2026 Chemistry Question Paper with Solution PDF
| BCECE 2026 Chemistry Question Paper | Download PDF | Check Solution |
Biuret test is not positive for:
This sulphide is not black:
The colour of \( Mg(NH_4)PO_4\cdot6H_2O \) is:
View Solution
Step 1: Understanding the Concept:
Magnesium ammonium phosphate hexahydrate, \( Mg(NH_4)PO_4\cdot6H_2O \) (commonly known as struvite), is formed during the qualitative estimation and identification of magnesium or phosphate ions.
Step 2: Key Formula or Approach:
When a magnesium salt solution is treated with ammonium chloride, ammonium hydroxide, and disodium hydrogen phosphate, a characteristic crystalline precipitate is formed.
The physical appearance and color of this precipitate serve as a confirmatory test.
Step 3: Detailed Explanation:
The reaction for the formation of the precipitate can be written as:
\[ Mg^{2+} + NH_4^+ + HPO_4^{2-} + 6H_2O \rightarrow Mg(NH_4)PO_4\cdot6H_2O\downarrow + H^+ \]
This precipitate forms as distinct, white, distinctively shaped (often described as star-shaped or coffin-lid-shaped) crystals.
Thus, the color of the compound is white.
Step 4: Final Answer:
The color of \( Mg(NH_4)PO_4\cdot6H_2O \) is White.
Quick Tip: The formation of a white crystalline precipitate of \( Mg(NH_4)PO_4\cdot6H_2O \) is a classic confirmatory test for magnesium ions (\(Mg^{2+}\)) in group analysis.
Heating \( Ba(NO_3)_2 \) produces:
The pyrimidine bases present in DNA are:
Tomato is a natural source of ___ acid.
Which product will be formed during Etard’s reaction?
Angular shape of ozone molecule consist of:
The number of atoms in 0.1 mole of a triatomic gas will be (\( N_A = 6.02 \times 10^{23} \)):
Which of the following compounds contains the -COOH (carboxylic) group?
BCECE 2026 Chemistry Marking Scheme
| Parameter | Details |
| Total Questions | 100 |
| Total Marks | 400 |
| Marks for Correct Answer | +4 Marks |
| Marks for Wrong Answer | -1 Mark |
| Marks for Unattempted Question | 0 Marks |
| Type of Questions | Objective Type (MCQs) |
| Exam Duration | 90 Minutes |
Comments