CBSE Questions for Class 11 Medical Chemistry Hydrogen Quiz 9 - MCQExams.com

$$H^+$$ in acid medium is balanced by which of the following species
  • $$O{H^ - }$$
  • $${H_2O }$$
  • $${H_2}$$
  • $${H_2}^ + $$
Water gas is a mixture of 
  • carbon monoxide and oxygen
  • carbon monoxide and hydrogen
  • hydrogen and oxygen
  • hydrogen and nitrogen
Which of the following ions have highest ionic density?
  • $$H^{+}$$
  • $$Li^{+}$$
  • $$Na^{+}$$
  • $$K^{+}$$
The correct statements among (a) to (d) regarding H$$_2$$ as a fuel are :
(a) It produces less pollutant than petrol.
(b) A cylinder of compressed dihydrogen weighs $$\sim 30$$ times more than a petrol tank producing the same amount of energy.
(c) Dihydrogen is stored in tanks of metal alloys like $$NaNi_5$$
(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ, respectively
  • b and d only
  • a, b and c only
  • b, c and d only
  • a and c only
In which of the following properties listed below, hydrogen does not show similarity with halogens?
  • Nature of the oxide
  • Electropositive character
  • Combination with alkali metals
  • Atomicity
NaH is an example of : 
  • Electron-rich hydride
  • Molecular hydride
  • Saline hydride
  • Metallic hydride
Why are the following metals not used in the lab preparation of hydrogen ?
  • calcium
  • iron
  • aluminium
  • sodium
Decomposition of $$H_{2}O_{2}$$ can be prevented by addition of
  • Acetanilide
  • Benzene
  • Alkali metal oxide
  • $$MnO_{2}$$
The hydride that is not electron deficent is:
  • $$B_2H_6$$
  • $$AlH_3$$
  • $$SiH_4$$
  • $$GaH_3$$
Which of the following are soluble in water?
  • $$ Na_2CO_3 $$
  • $$ BaC_2O_4 $$
  • $$ MgCO_3 $$
  • $$ Ca(NO_3)_2 $$
When a molten ionic hydride is electrolyzed 
  • hydrogen is liberated at the cathode
  • hydrogen is liberate at the anode
  • there is no reaction
  • $${ H }^{ - }$$ ions produced migrate to the cathode
$$Ca{H_2}$$ is an example of:
  • Ionic hydride
  • Covalent hydride
  • Metallic hydride
  • Polymeric hydride
Which of the following does not react with water?
  • Li
  • Be
  • Na
  • K
In lab $$H _ { 2 } \mathrm { O } _ { 2 }$$ is prepared by
  • cold $$H_{2} S O _ { 4 } + B a O _ { 2 }$$
  • $$H C l + B a O _ { 2 }$$
  • $$\mathrm { Conc } . \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } + \mathrm { Na } _ { 2 } \mathrm { O } _ { 2 }$$
  • $$H _ { 2 } + O _ { 2 }$$
Oxidizing properties of hydrogen peroxide are explained more by the
  • Baeyer's formula
  • Kingzett's formula
  • Thenard formula
  • Victor Meyer formula
An element reacts with hydrogen to form a compound 'A' which on treatment with water liberates hydrogen gas. The element can be:  
  • Nitrogen
  • Chlorine
  • Selenium
  • Calcium
Hydrogen is not obtained when Zinc reacts with:
  • Cold water
  • dil. HCl
  • dil. $$H_2SO_4$$
  • hot 20%  NaOH solution
Which of the following reaction cannot give hydrogen gas?
  • $$Zn+con.H_{2}SO_{4}$$
  • $$C$$ + very dil $$H_{2}SO_{4}$$
  • $$Mn$$ + extremely dil $$HNO_{3}$$ ( 2 % )
  • $$Pb$$+dil $$HNO_{3}$$
Which of the following does not gives $$H_2O_2$$?
  • $$H_2S_2O_8+H_2O_(excess)\xrightarrow { \triangle } $$
  • $$H_4P_2O_8+H_2O(excess)\rightarrow $$
  • $$BaO_2+dil Acid\xrightarrow { \triangle }$$
  • $$PbO_2+dil H_2SO_4\longrightarrow $$
In the laboratory $$H_2O_2$$ is prepared by the action of :
  • cold dilute $$H_2SO_4$$ on hydrated $$BaO_2$$
  • dil. $$HCl$$ on $$MnO_2$$
  • cold $$H_2SO_4$$ on $$MnO_2$$
  • aqueous alkali on $$Na_2O_2$$
The boiling point of water is exceptionally high because:
  • There is covalent bond between H and O
  • Water molecules are linear
  • Water molecules associate due to hydrogen bonding
  • Water molecules are not linear.
 In which of the following hydrides, the law of constant composition does not hold good:
  • Saline hydride
  • Metallic hydride
  • Molecular hydride
  • All of these
Hydrogen can be placed in VIIA ( 17th group) of periodic table because:
  • hydrogen forms hydrides like $$NaH$$
  • hydrogen has isotopes $$D$$ and $$T$$
  • it is light
  • hydrogen combines with halogens
The bond angle and dipole moment of water respectively are:
  • $$109.5^o, 1.84\ D$$
  • $$107.5^o, 1.56\ D$$
  • $$104.5^o, 1.84\ D$$
  • $$102.5^o, 1.56\ D$$
An orange coloured solution acidified with $$H_2SO_4$$ and treated with a substance $$'X'$$ gives a blue coloured solution of $$CrO_5$$. The substance $$'X'$$ is:
  • $$H_2O$$
  • $$dil. HCl$$
  • $$H_2O_2$$
  • $$conc. HCl$$
Hydrogen peroxide was for the first time prepared by:
  • Priestley
  • Thenard
  • Gay- Lussac
  • Bernard
Water is oxidised to oxygen by:
  • Ozone
  • $$KMnO_4$$
  • $$H_2O_2$$
  • $$F_2$$
  • $$ClO_2$$
In which of the following reactions does water act as an oxidising agent?
  • $$3F_2 +3H_2O \longrightarrow 6HF+O_3$$
  • $$CaC_2 +2H_2O \longrightarrow Ca(OH)_2+C_2 H_2$$
  • $$C+H_2O \longrightarrow CO+H_2$$
  • $$AIN +3H_2O\longrightarrow Al(OH)_3+NH_3$$
Which is not linear?
  • $$CO_2$$
  • $$HCN$$
  • $$C_2H_2$$
  • $$H_2O$$
Phosphorous is kept in:
  • kerosene
  • alcohol
  • water
  • ammonia
Which of the following is/are basic hydride (s)?
  • $$HCl$$
  • $$NH_{3}$$
  • $$H_{2}S$$
  • $$PH_{3}$$
For pure water at an unknown temperature, the $$pH$$ should always be equal to
  • $$7$$
  • $$ > 7$$
  • $$ < 7$$
  • $$any\ of\ them$$
When steam reacts with red hot coke to form $$CO_2$$ and hydrogen:
  • water acts as oxidising agent
  • water acts as reducing agent
  • carbon acts as oxidising agent
  • there is no oxidising or reduction
Choose the correct answer for a given amount of hydrogen.
  • Mole of $$H_{2}=$$ mole of $$H$$
  • Equivalents of $$H_{2}=$$ Equivalents of $$H$$
  • Mole of $$H_{2}=$$ Equivalents of $$H_{2}$$
  • Mole of $$H=$$ Equivalents of $$H$$
Which of the following choices match(es) with hydrogen gas at $$200\ atm$$ and $$273\ K$$?
  • $$Z\neq 1$$
  • Attractive forces are dominant
  • $$PV=nRT$$
  • $$P(V-nb)=nRT$$
Water is a 
  • Amphoteric in nature
  • Aprotic solvent
  • Protophobic solvent
  • None of these
Hydrogen by donating one electron forms $$H^+$$. In this property, it resembles with 
  • Transitional elements
  • Alkaline earth metals
  • Alkali metals
  • Halogens
Which of the followings explanation is best for 
  • The ionization energy of hydrogen is too high for group of alkali metals but too low of halogens group
  • Hydrogen can form compounds with all other elements
  • Hydrogen is much lighter than the alkali metals or the halogens
  • None of these
The surface tension of which of the following liquid is maximum 
  • $$ H_{2}O $$
  • $$ C_{6}H_{6} $$
  • $$ CH_{3}OH $$
  • $$ C_{2}H_{6}OH $$
The oxidation number of hydrogen in $${MH}_{2}$$ is
  • $$+1$$
  • $$-1$$
  • $$+2$$
  • $$-2$$
In $$C+{H}_{2}O\rightarrow  CO+{H}_{2},\ {H}_{2}O$$ acts as
  • Oxidising agent
  • Rducing agent
  • (A) and (B) both
  • None of these
Heavy water freezes at
  • $$0^\circ C$$
  • $$3.8^\circ C$$
  • $$38^\circ C$$
  • $$-0.38^\circ C$$
Which of the following reaction produces hydrogen?
  • $$ Mg+H_{2}O $$
  • $$ BaO_{2}+HCl $$
  • $$ H_{2}S_{4}O_{8}+H_{2}O $$
  • $$ Na_{2}O_{2}+2HCl $$
Hydrogen is
  • electropositive
  • electronegative
  • both electropositive as well as electronegative
  • neither electropositive nor electronegative
What happens when electric current is passed through an ionic hydride in the molten state?
  • Hydrogen is liberated at the anode
  • Hydrogen is liberated at the cathode
  • No reaction takes place
  • Hydride ion migrates towards cathode
In all its properties, hydrogen resembles
  • alkali metals only
  • halogens only
  • both alkali metals and halogens
  • neither alkali metals nor halogens
Hydrogen readily combines with non-metals and thus it shows its
  • electronegativity character
  • electropositive character
  • both (A) and (B)
  • none of these
Hydrogen molecule differs from chlorine molecule in which of the following respect?
  • Hydrogen molecule is non-polar but chlorine molecule is polar
  • Hydrogen molecule is polar while chlorine molecule is non-polar
  • Hydrogen molecule can from intermoelcular hydrogen bonds but chlorine molecule can not
  • Hydrogen molecule cannot participate in coordination bond formation but chlorine molecule can
lonization energy of hydrogen is
  • Equal to that of chlorine
  • Lesser than that of chlorine
  • Slightly higher than that of chlorine
  • Much higher than that of chlorine
Which of the following explanation is best for not placing hydrogen with alkali metals or halogen?
  • The ionization energy of hydrogen is too high for group of alkali metals but too low for halogen group
  • Hydrogen can form compounds
  • Hydrogen is a much lighter element than the alkali metals or halogens
  • Hydrogen atom does not contain any neutron
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