Hydrogen Test -...

Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?

Why does \(H ^+\) ion always get associated with other atoms or molecules?

Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is

Which of the following hydrides is electron-precise hydride?

Radioactive elements emit \(\alpha,\beta\,and\,\gamma\) rays and are characterised by their half-lives. The radioactive isotope of hydrogen is

Which of the following statements are not true for hydrogen?

(i) It exists as diatomic molecule.

(ii) It has one electron in the outermost shell.

(iii) It can lose an electron to form a cation which can freely exist.

(iv) It forms a large number of ionic compounds by losing an electron.

Dihydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and \(H_2\) gas is formed. It is known as.......

(i) Water gas

(ii) Syngas

(iii) Producer gas

(iv) Industrial gas

Consider the reactions:

(A) \(H_2O_2+2HI\rightarrow I_2+2H_2O\)

(B) \(HOCl+H_2O_2\rightarrow H_3O^++Cl^-+O_2\)

Which of the following statements is correct about \(H_2O_2\) with reference to these eactions? Hydrogen perioxide is .

The oxide that gives \(H_2O_2\) on treatment with dilute \(H_2SO_4\) is-

Correlate the items listed in Column I with those listed in Column II. Find out as many correlations as you can.

Which of the following statement(s) is/are correct in the case of heavy water?

(i) Heavy water is used as a moderator in nuclear reactor.

(ii) Heavy water is more effective as solvent than ordinary water.

(iii) Heavy water is more associated than ordinary water.

(iv) Heavy water has lower boiling point than ordinary water.

Which of the following equations depicts the oxidising nature of \(H_2O_2\)?

Which of the following statements about hydrogen are correct?

(i) Hydrogen has three isotopes of which protium is the most common.

(ii) Hydrogen never acts as cation in ionic salts.

(iii) Hydrogen ion, \(H ^+ \), exists freely in solution.

(iv) Dihydrogen does not act as a reducing agent.

Which of the following equations depicts reducing nature of \(H_2O_2\)?

Hydrogen peroxide is.

Some of the properties of water are described below. Which of them is/ are not correct?

(i) Water is known to be a universal solvent.

(ii) Hydrogen bonding is present to a large extent in liquid water.

(iii) There is no hydrogen bonding in the frozen state of water.

(iv) Frozen water is heavier than liquid water.

Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of

(i) Chlorides of Ca and Mg in water

(ii) Sulphates of Ca and Mg in water

(iii) Hydrogen carbonates of Ca and Mg in water

(iv) Carbonates of alkali metals in water

Which of the following reactions increases production of dihydrogen from synthesis gas?

Match Column I with Column II for the given properties/applications mentioned therein.

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Permanent hardness of water is removed by treatment with washing soda.

Reason (R): Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.