Which of the following does NOT contain ionic bond?
A. CaO
B. NaF
C. KCl
D. CH₄
Answer: Option D
Solution (By JKSSB Mock Tests)
CH₄ (methane) has covalent bonds where carbon shares electrons with four hydrogen atoms. CaO (Ca²⁺ O²⁻), KCl, and NaF are ionic compounds formed by electron transfer between a metal and a non-metal. Ionic bonds form when electronegativity difference is large. Covalent bonds typically between non-metals with similar electronegativities.
Explanation:
Ethene (C2H4) is an alkene containing a reactive carbon-carbon double bond. When bromine water (brown) is added to ethene, the double bond breaks and bromine atoms add across it to form 1,2-dibromoethane (colorless). This addition reaction decolorizes the bromine water, serving as a test for unsaturation.
Explanation:
Gamma rays are electromagnetic waves with no mass and no charge, thus they interact least with matter and have the highest penetrating power. Alpha particles (He nuclei) are stopped by paper. Beta particles (electrons) can be stopped by aluminum. Gamma requires thick lead or concrete.
No comments yet. Be the first to start the discussion!