test tube B contains turmeric solution, test tube C contains detergent solution and test tube D
contains pure water. Which of the following will you observe when you put ?
(a) a piece of blue litmus paper in each test tube
(b) a piece of red litmus paper in each test tube
(c) few drops of phenolphthalein solution to each test tubeChange in colour
of blue litmusChange in colour
of red litmusChange on addition
of phenolphthalein(i) A Remains blue Turns blue Turns pink (ii) B Turns red Remains red Colourless (iii) C Remains blue Turns blue Turns pink (iv) D Remains blue Turns blue Colourless
The question asks to identify the problem among the options that is inter-disciplinary, meaning it involves content or skills from two or more distinct academic fields.
Analysis of Options:
- Draw the mirror image of a given figure.
Discipline: Geometry / Spatial Reasoning.
- How many lines of symmetry are there in a given figure.
Discipline: Mathematics / Geometry.
- Write your name and draw the lines of symmetry in each alphabet wherever possible.
This problem requires skills from two different fields:
- Language Arts / Writing: The task requires writing and recognition of letters (the name).
- Mathematics / Geometry: The task requires analytical knowledge of symmetry applied to those letterforms.
- Draw the lines of symmetry in a given geometrical figure.
Discipline: Geometry.
Final Conclusion
The problem in Option 3 uniquely combines language (writing) with geometric principles, making it inter-disciplinary.
The correct option is Option 3.
Important Questions from Concepts of Acids and Bases
Write the conjugate acids for the following Brönsted bases :
NH2-, NH3, HCOO-
The order of correct acidic strengths of halogen acids is
The base ionization constant, Kb, of ammonia in water is 1.8 × 10-5. The value of the acid ionization constant, Ka, of the conjugate acid, is closest to
- Which of the following chemical reaction is example for Lux-Flood definition ?
Identify A, B, C and D in the following table:
Name of the salt Salt obtained from Acid Base Ammonium chloride HCl A Sodium nitrate $HNO_3$ B Sodium chloride C D
Choose the correct option.
