In an electrochemical cell, the salt bridge provides:
A. Ionic contact and completes the circuit
B. Current
C. Electron flow
D. Voltage
Answer: Option A
Solution (By JKSSB Mock Tests)
The salt bridge (often KCl-agar) allows ion migration to maintain electrical neutrality in half-cells, completing the circuit. It prevents direct mixing of electrolytes.
Explanation:
Atomic number 11 is sodium (Na). The electron shells fill as 2 in K, 8 in L, and the remaining 1 in M. Thus configuration is 2,8,1. It belongs to Group 1 (alkali metals) and Period 3. The configuration determines its valency (1) and reactivity.
Explanation:
Boiling precipitates Ca/Mg bicarbonates as carbonates, removing temporary hardness. It does not remove permanent hardness (sulfates/chlorides). It kills microbes but does not remove dissolved salts.
Explanation:
Flammability describes how a substance reacts with oxygen to burn, which is a chemical change. Boiling point, density, and melting point are physical properties because they can be observed without changing the chemical identity of the substance. Chemical properties are only observed during a chemical reaction.
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