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Melting and Freezing

2. Does the m...

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2. Does the melting point of chlorides of group 2 metals decrease from BeCl2 to BaCl2?

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Q. Which of the following orders of alkaline-earth metal chlorides are correct:

(a) covalent nature :

R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}

(b) melting point :

B e C l_{2} < M g C l_{2} < C a C l_{2} < S r C l_{2} < B a C l_{2} < R a C l_{2}

(c) lattice energy :

R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}

(d) thermal stability :

R a C l_{2} < B a C l_{2} < S r C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}

Q. The correct sequence of increasing melting point of

B e C l_{2}, M g C l_{2}, C a C l_{2}, S r C l_{2}

B a C l_{2}

Q. Which statements are true out of the following :

S_{1}

A g I

is less soluble in water than

A g F

due to more polarization of

I^{-}

in comparison to

F^{-}

S_{2}

: The melting point of

B a C l_{2}

is higher than the melting point of

B e C l_{2}

due to greater ionic nature of

B a C l_{2}

S_{3}

: The order of hydrated radii is :

A l^{3 +} (a q) > M g^{2 +} (a q) > N a^{+} (a q)

S_{4}

: Thermal stability of alkali metal carbonates decreases down the group,

Q. Explain how does the melting point change on moving from group-1 to group-2 in the periodic table?

Q. Find the number of chloride(s) which do not impart color to the flame from the following :

B e C l_{2}, S r C l_{2}, M g C l_{2}, C a C l_{2}, B a C l_{2}

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