Q38.When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to (1) B2O3 (2) CoBO22 (3) CoB4O7 (4) CoB4O5OH4
What This Question Tests
This question is a direct recall of a factual detail about the components of Portland cement, specifically what is added to control its setting time.
Concepts Tested
Formulas Used
[]
📚 NCERT Sections This Tests
5.15 — Discuss The Nature Of Bonding In The Following Coordination Entities On The
Chemistry Class 11 · Chapter 5
5.15 Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory: (i) [Fe(CN)6] 4– (ii) [FeF6] 3– (iii) [Co(C2O4)3]3– (iv) [CoF6] 3–
5.13 — Aqueous Copper Sulphate Solution (Blue In Colour) Gives:
Chemistry Class 11 · Chapter 5
5.13 Aqueous copper sulphate solution (blue in colour) gives: (i) a green precipitate with aqueous potassium fluoride and (ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.
4.14 — Describe The Preparation Of Potassium Dichromate From Iron Chromite Ore.
Chemistry Class 11 · Chapter 4
4.14 Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?
📋 Question Details
- Chapter
- s-block Elements
- Topic
- Portland Cement
- Year
- 2022
- Shift
- 29 Jul Shift 2
- Q Number
- Q38
- Type
- MCQ
- NCERT Ref
- Class 11 Chemistry Ch 10: The s-Block Elements
More from this Chapter
Q78.The ionic mobility of alkali metal ions in aqueous solution is maximum for (1) K + (2) Rb+ (3) Li+ (4) Na+
Q43.A metal M on heating in nitrogen gas gives Y . Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. Y is (1) NH3 (2) Mg(NO3)2 (3) Mg3 N2 (4) MgO
Q35.Which one of the following will react most vigorously with water? JEE Main 2012 (19 May Online) JEE Main Previous Year Paper (1) Li (2) K (3) Rb (4) Na
Q40.Fire extinguishers contain H2SO4 and which one of the following? JEE Main 2012 (26 May Online) JEE Main Previous Year Paper (1) NaHCO3 and Na2CO3 (2) Na2CO3 (3) NaHCO3 (4) CaCO23