1️⃣ The order of reducing power of halide ion is:
a I⁻ > Br⁻ > Cl⁻ > F⁻
b Br⁻ > Cl⁻ > I⁻ > F⁻
c I⁻ > Cl⁻ > F⁻ > Br⁻
d F⁻ > Cl⁻ > Br⁻ > I⁻
✅ Correct Answer: (a) I⁻ > Br⁻ > Cl⁻ > F⁻
The halide ions’ reducing power decreases as you move up the group due to the decreasing ionic size and increasing electronegativity.
The halide ions’ reducing power decreases as you move up the group due to the decreasing ionic size and increasing electronegativity.
2️⃣ These give violet colour to the flame:
a Na⁺
b Ca²⁺
c Sr²⁺
d K⁺
✅ Correct Answer: (d) K⁺
Potassium ions produce a violet flame during flame tests due to the excitation of electrons.
Potassium ions produce a violet flame during flame tests due to the excitation of electrons.
3️⃣ The coordination number of [Cr(en)₃]³⁺ is:
a 4
b 3
c 2
d 6
✅ Correct Answer: (d) 6
Each ethylenediamine (en) ligand is bidentate, coordinating through two donor atoms, so three en ligands give a coordination number of 6.
Each ethylenediamine (en) ligand is bidentate, coordinating through two donor atoms, so three en ligands give a coordination number of 6.
4️⃣ This fertilizer provides Nitrogen and Phosphorus:
a Urea
b Ammonium Nitrate
c Diammonium Phosphate
d Potassium Nitrate
✅ Correct Answer: (c) Diammonium Phosphate
Diammonium Phosphate (DAP) supplies both nitrogen (from NH₄⁺) and phosphorus (from PO₄³⁻), making it a dual-nutrient fertilizer.
Diammonium Phosphate (DAP) supplies both nitrogen (from NH₄⁺) and phosphorus (from PO₄³⁻), making it a dual-nutrient fertilizer.
5️⃣ This is the hottest part of the atmosphere:
a Mesosphere
b Thermosphere
c Stratosphere
d Troposphere
✅ Correct Answer: (b) Thermosphere
The thermosphere is the hottest layer of the atmosphere because it absorbs high energy solar radiation (X rays and UV rays). Temperatures here can rise above 1500 °C.
The thermosphere is the hottest layer of the atmosphere because it absorbs high energy solar radiation (X rays and UV rays). Temperatures here can rise above 1500 °C.
6️⃣ Cathode in Castner-Kellner Cell is:
a Titanium Blocks
b Carbon rods
c Mercury
d Iron Container
✅ Correct Answer: (c) Mercury
In the Castner-Kellner cell, mercury acts as the cathode and forms an amalgam with sodium.
In the Castner-Kellner cell, mercury acts as the cathode and forms an amalgam with sodium.
7️⃣ Diagonal relationship of lithium is with:
a Na
b Ca
c Be
d Mg
✅ Correct Answer: (d) Mg
Diagonal relationships in the periodic table commonly pair Li with Mg (and Be with Al). Li and Mg share similar ionic radii and charge densities, show more covalent character than the rest of their groups, form stable nitrides and oxides.
Diagonal relationships in the periodic table commonly pair Li with Mg (and Be with Al). Li and Mg share similar ionic radii and charge densities, show more covalent character than the rest of their groups, form stable nitrides and oxides.