Class 11th Chemistry – 9 Hydrogen MCQs
Pure water has ___ electrically conductivity.
Pure water has very low electrically conductivity. Since water is a weak electrolyte, it undergoes ionization to a small extent to give hydronium ions and hydroxide ions. As a result, pure water has very low electrical conductivity.
Ionic hydrides ____.
Ionic hydrides conduct electricity. Covalent hydrides are prepared by direct combination of elements. Metallic hydrides occupy the vacant spaces in metallic lattices. Molecular hydrides consist of discrete covalent molecules which are held together by weak van der Waals' forces of attraction.
Which hydride is an ionic hydride?
All meta hydrides are ionic in nature.
The boiling point of water is exceptionally high because
The high boiling point of water is due to H-bonding.
The acid formed on hydrolysis of sodium carbonate is ____.
The acid formed on hydrolysis of sodium carbonate is H2CO3.Sodium carbonate, on hydrolysis, produces a strong base and a weak acid. Therefore, an aqueous solution of sodium carbonate is alkaline in nature. The reaction is as follows: Na2CO3 (s) + 2 H2O(l) → 2 NaOH (aq) + H2CO3 (aq) strong base weak acid.
Hydrogen will not reduce
H2 will not reduce heated Al2O3.
Nuclear energy can be used to satisfy the energy demand for
Nuclear energy can be used to satisfy the energy demand for electrical energy production.
____ hydrides are classified into electron-deficient, electron-exact and electron rich hydrides.
Molecular hydrides are classified into electron-deficient, electron-exact and electron rich hydrides. Depending upon the number of electrons and bonds present in their Lewis structures, molecular hydrides have been classified as electron-deficient, electron-exact and electron rich hydrides.
The isotopes, deuterium and tritium differ in ____.
The isotopes, deuterium and tritium differ in neutrons. The atomic number of deuterium is 1 and its mass number is 2. Therefore, its nucleus has one proton and one neutron. The atomic number of tritium is 1 and its mass number is 3. Therefore, its nucleus has one proton and two neutrons.
The decomposition of H2O2 is accelerated by--
Decomposition of H2O2 can be accelerated by finely divided metals such as Ag, Au, Pt, Co, Fe etc.
The O-O-H bond angle in H2O2 is
O-O-H bond angle in H2O2 is 97o.
An aqueous solution of copper sulphate is ____ in nature.
An aqueous solution of copper sulphate is acidic in nature. Hydrolysis of copper sulphate produces a strong base Cu(OH)2 and a weak acid H2SO4.Therefore, an aqueous solution of copper sulphate is acidic in nature. The reaction is as follows: CuSO4 + 2 H2O → 2 Cu(OH)2+H2SO4.
The complete balanced equation for Ca(HCO3)2+Ca(OH)2is ____.
The complete balanced equation is Ca(HCO3)2+Ca(OH)2 → 2 CaCO3 + 2 H2O. In lime-soda process, calculated quantities of slaked lime and sodium carbonate are used. Slaked lime removes temporary hardness, while sodium carbonate removes permanent hardness.
Hydrogen is not obtained when zinc reacts with
Zinc has no action on cold water.
The ionization of hydrogen atom would give rise to
H(g) →H+ (g) + e-
The ____ groups are referred to as hydride gap.
The 7 - 9 groups are referred to as hydride gap. The groups 3 - 5, 10 - 12, on heating with hydrogen under pressure, form hydrides. In group 6, Cr alone forms the hydride. The groups 7 - 9 do not form hydrides. This region in the periodic table is called the hydride gap.
What is formed when calcium carbide reacts with heavy water?
CaC2+2D2O→C2D2+Ca(OD)2
Liquid hydrogen used in the fuel cell has an advantage that
Liquid hydrogen used in the fuel cell as fuels has an advantage that it has a very high calorific value as compared to other conventional fuels.
Which of the metal evolves hydrogen on reacting with cold dilute HNO3?
Mg + dil. HNO3→Mg(NO3)2 + H2. (Mg and Mn give H2 with dil. HNO3).
The H-O-H angle in water molecule is about
The hybridization in water is sp3 and bond angle 105o
Dihydrogen can be liquefied under ____ .
Dihydrogen can be liquefied under low temperature and high pressure. Hydrogen can exist as a liquid under high pressure and an extremely low temperature of 20.28 K (−252.87°C, −423.17°F).
Hydrogen is present in ____ hydrides.
Hydrogen is present in ionic hydrides. Ionic hydrides are formed by elements with electro negatives ranging between 0.9 and 1.2 i.e., the group IA and IIA element and the lanthanides. Metallic hydrides are formed by some transition metals with electro negativities ranging from 1.2 to 1.4.
The group ___________ is called electron-deficient hydrides.
The group 13 is called electron-deficient hydrides. Hydrides of group 13 do not have sufficient number of electrons to form normal covalent bonds and hence are called electron-deficient hydrides. They generally exist in polymeric forms such as B2H6, B4H10, (AlH3)n, etc.
____ is the radioactive isotope of hydrogen.
Tritium is the radioactive isotope of hydrogen. Tritium is the least abundant of all the isotopes of hydrogen. It is formed in the upper atmosphere by reactions induced by cosmic rays. It is radioactive with a short half-life of 12.33 years.
The property of hydrogen which distinguishes it from alkali metals is
Hydrogen is a non-metal while all other members of group 1 (alkali metals) are metals.
The volume strength of 1.5 N H2O2 solution is
Volume strength = 5.6 * Normality = 5.6 * 1.5 = 8.4 L
Hydrogen can behave as a metal
Hydrogen behaves as a metal at very high pressure on the order of 250,000 times atmospheric pressure.
The product of combustion of hydrogen is
Hydrogen on combustion with oxygen forms H2O
The structure of H2O2 is
Structure of H2O2 is non planar.
Hydrogen peroxide acts as an oxidising agent in ____.
Hydrogen peroxide acts as an oxidizing agent in acidic and alkaline medium. Hydrogen peroxide behaves as an oxidizing as well as a reducing agent in both, acidic and alkaline solutions. The equation is as follows: In acidic medium, H2O2 (aq) + 2 H+ (aq) + 2 e- → 2 H2O (l) In alkaline medium, H2O2 (aq) + 2 OH- (aq) + 2 e- → 3 OH-(aq).
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