The s-Block Ele...

Among the following the least thermally stable is:

The set representing the correct order of ionic radii is:

Which of the following is a false statement?

Which alkaline earth metal compound is volatile?

Which of the following substances are formed when lithium is heated in air?

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Which of the following has lowest thermal stability?

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Which of the following statements is not true about alkali metals ?

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A solution of a compound $$X$$ in dilute $$HCl$$ on treatment with a solution of $$BaCl_2$$ gives a white precipitate of compound $$Y$$ which is insoluble in conc. $$HNO_3$$ and conc. $$HCl$$. Compound $$X$$ imparts golden yellow colour to the flame.
$$\underset{(\text{imparts golden yellow colour})}{X (\text{solution in dilute HCl})}+BaCl_2\longrightarrow \underset{white \\ ppt}{Y}  \xrightarrow[Conc Hcl]{Conc.HNO_3\\ +} Insoluble$$
What are compounds $$X$$ and $$Y$$?

The properties of $$Li$$ are similar to those of $$Mg$$. This is because:

For a given sample of water containing the following impurities
$$Mg{ \left( H{ CO }_{ 3 } \right)  }_{ 2 }=73mg/L;\quad Ca{ \left( H{ CO }_{ 3 } \right)  }_{ 2 }=162mg/L;\quad Ca{ SO }_{ 4 }=136mg/L$$
$$Mg{ Cl }_{ 2 }=95mg/L;\quad Ca{ Cl }_{ 2 }=111mg/L;\quad NaCl=100mg/L$$
Then the total hardness (temporary and permanent) of above water sample is?