Given below are two statements: Statement I: Wet cotton clothes made of cellulose based carbohydrate takes comparatively longer time to get dried than wet nylon polymer based clothes. Statement II: Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes. In the light of above statements, choose the correct answer from the options given below :

Core Logic

Let's check the mineral formulas assigned to common names:

• Fluorspar: The formula for fluorspar (also known as fluorite) is CaF₂$CaF_2$, not BF₃$BF_3$. This pair is incorrect.
• Cryolite: Correctly given as Na₃AlF₆$Na_3AlF_6$.
• Fluoroapatite: Correctly given as 3Ca₃(PO₄)₂ · CaF₂$3Ca_3(PO_4)_2 \cdot CaF_2$ (or Ca₅(PO₄)₃F$Ca_5(PO_4)_3F$).
• Carnallite: Correctly given as KCl · MgCl₂ · 6H₂O$KCl \cdot MgCl_2 \cdot 6H_2O$.

Step 1: Final Conclusion

The incorrect pair is option 1.

Chapter Mix

Class 12 Chemistry: General Principles and Processes of Isolation of Elements Class 11 Chemistry: The p Block Elements

Core Logic

The flame test is typically used to characterize certain s-block metals (like alkali and alkaline earth metals) and a few transition metals that impart characteristic colors to a Bunsen flame.

Evaluating the given ions:

• Sr²⁺$Sr^{2+}$: Crimson red flame. (Yes)
• Ba²⁺$Ba^{2+}$: Apple green flame. (Yes)
• Ca²⁺$Ca^{2+}$: Brick red flame. (Yes)
• Cu²⁺$Cu^{2+}$: Blue-green flame. (Yes)
• Zn²⁺$Zn^{2+}$: No characteristic flame color in standard qualitative analysis. (No)
• Co²⁺$Co^{2+}$: No characteristic flame color. (No)
• Fe²⁺$Fe^{2+}$: No characteristic flame color. (No)

Step 1: Final Count

The metal ions characterized by flame tests are Sr²⁺, Ba²⁺, Ca²⁺$Sr^{2+}, Ba^{2+}, Ca^{2+}$, and Cu²⁺$Cu^{2+}$. Total number = 4.

Chapter Mix

Class 11 Chemistry: The s Block Elements Class 12 Chemistry: The d and f Block Elements

Core Logic

Materials are classified based on their electrical conductivity at room temperature:

• Conductors: Conductivity range is generally between 10⁴$10^4$ to 10⁷ S m⁻¹$10^7\text{ S m}^{-1}$ for metals, but aqueous electrolytes and certain semi-metals fall in the intermediate 1$1$ to 10³ S m⁻¹$10^3\text{ S m}^{-1}$ range broadly qualifying as conductors in the context of typical chemical classifications.
• Semiconductors: 10⁻⁶$10^{-6}$ to 10⁴ S m⁻¹$10^4\text{ S m}^{-1}$
• Insulators: 10⁻²⁰$10^{-20}$ to 10⁻¹⁰ S m⁻¹$10^{-10}\text{ S m}^{-1}$

Wait, typical values for metallic conductors are high, but comparing them strictly against the NCERT table: 2.1 × 10³$2.1 \times 10^3$ (Conductor) 1.2 × 10$1.2 \times 10$ (Conductor) 3.91$3.91$ (Conductor) 1.0 × 10³$1.0 \times 10^3$ (Conductor)

1.0 × 10⁻¹⁶$1.0 \times 10^{-16}$ (Insulator) 1.5 × 10⁻²$1.5 \times 10^{-2}$ (Semiconductor) 1.0 × 10⁻⁷$1.0 \times 10^{-7}$ (Semiconductor / Insulator)

Step 1: Final Counting

The materials with conductivities 2.1 × 10³$2.1 \times 10^3$, 1.2 × 10$1.2 \times 10$, 3.91$3.91$, and 1.0 × 10³$1.0 \times 10^3$ fall into the category of conductors. Therefore, the number of conductors is 4$4$.

Chapter Mix

Class 12 Chemistry: Solid State Class 12 Chemistry: Electrochemistry