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Hydrogen and S block Elements I

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Question 1

The main oxides formed on combustion of Li, Na and K in excess of air are, respectively:

Question 2

Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect, is:

Question 3

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

Question 4

The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :

Question 5

From the following statements regarding H₂O₂ choose the incorrect statement:

Question 6

The metallic sodium dissolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to formation of:

Question 7

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting

to :

Question 8

Reaction of NaCl with conc. H₂SO₄ liberates a gas, X that turns moist blue litmus paper red. When gas X is passed into a test tube containing egg shell powder suspended in water another gas, Y is generated which when passed through lime water makes it milky. The gases X and Y, respectively, are

Question 9

Which of the following is most acidic?

Question 10

Which physical property of dihydrogen is wrong?

Question 11

How many chiral compounds are possible on monochlorination of 2-methyl butane ?

Question 12

H₂ gas is absorbed on the metal surface like tungsten. This follows ………. order reaction.

Question 13

Very pure hydrogen (99.9%) can be made by which of the following processes ?

Question 14

Hydrogen bomb is based on the principle of

Question 15

Which of the following represents correct acidity order Li₂O,BeO and B₂O₃?

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Jan 6JEE & BITSAT