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An element X ...

Question

An element X reacts with hydrogen, when heated, to from a covalent hydride $H_{2} X .$ If $H_{2} X$ has a smell of notten eggs, the element X is likely to be:

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Solution

(b) sulphur
Because sulphur reacts with hydrogen to form a covalent hydride, $H_{2} S$ that has the smell of rotten eggs.

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X

reacts with hydrogen, when heated, to form covalent hydride

H_{2} X

H_{2} X

has a smell of rotten eggs, the element

X

is likely to be:

Q. An element X reacts with hydrogen, when heated, to form a covalent hydride H₂X. If H₂X has a smell of rotten eggs, the element X is likely to be:
(a) carbon
(b) sulphur
(c) chlorine
(d) phosphorus

Q. An element X forms the following compounds with hydrogen, carbon and oxygen :

H₂X, CX₂, XO₂, XO₃

State the three valencies of element X which are illustrated by these compounds.

Q. Assertion : An element X with the electronic configuration

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}

can be expected to form a compound of the type

H_{2} X

Reason : Two additional electrons fill the valence shell of an element with outer electronic configuration

3 s^{2} 3 p^{4}

Q. Differentiate with respect to

x

tan h 4 x

sec h 2 x

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