CBSE Questions for Class 11 Medical Chemistry Hydrogen Quiz 1 - MCQExams.com

The reaction of water with ammonia is given the following equation, $$H_2O+NH_3\rightleftharpoons NH^+_4+OH^-$$. In this reaction water behaves as :
  • neutral
  • base
  • acid
  • both acid and base
Assertion: $$H_{2}O$$ is the only hydride of the chalcogens which is liquid.
Reasons:In ice, each $$O$$ atom is surrounded by $$4H$$ atoms.
  • Both A and R are correct and R is the correct explanation of A
  • Both A and R are correct but R is not the correct explanation of A
  • A is not correct but R is correct
  • both A and R are not correct
The photolysis of water gives the substance
  • $$OH^- + H^+$$
  • $$H_2 + OH^-$$
  • $$H_2 + O_2$$
  • $$H_2O + H_2O_2$$
Hydrogen can be put in halogen group because
  • It has deuterium and tritium as isotopers
  • It forms hydrides like chlorides
  • It contains one electron only
  • It is light
In the reaction $$2H_2O \rightleftarrows H_3O^+ +OH^-$$, water is: 
  • A weak base
  • A weak acid
  • Both a weak acid and a weak base
  • Neither an acid nor a base
Only one element of ________ forms hydride. 
  • group 6
  • group 7
  • group 8
  • group 9
Sodium on reaction with cold water produces a residue. The nature of residue is:
  • colourless, slippery and slightly cold
  • colourful, soapy and slightly warm
  • colourless, soapy and slightly warm
  • colourful, slippery and slightly cold
Which of the following combination will produce $$H_{2}$$ gas?
  • $$Au$$ metal and $$NaCN(aq)$$ in the presence of air
  • $$Cu$$ metal and $$conc. HNO_{3}$$
  • $$Fe$$ metal and $$conc.HNO_{3}$$
  • $$Zn$$ metal and $$NaOH(aq)$$
Assertion: The $$O-O$$ bond length in $$H_2O_2$$ is shorter than that of $$O_2F_2$$.
Reason: $$H_2O_2$$ is an ionic compound.
  • If both assertion and reason are true and the reason is a correct explanation of the assertion
  • If both assertion and reason are true but reason is not a correct explanation of the assertion
  • If the assertion is true but reason is false
  • If both the assertion and reason are false
  • If the assertion is false but the reason is true
Which of the following process is not used in the concentration of $$H_{2}O_{2}$$?
  • Distillation under reduced pressure
  • Evaporation on a water bath
  • Fractional crystallization
  • Sublimation
As oxygen is ______ soluble in water. Air dissolved in water contains a higher percentage of oxygen (30-35%) than ordinary air (21%).
  • less 
  • more
  • not
  • none of these
Which of the following gas is lightest?
  • Dihydrogen
  • Helium
  • Dinitrogen
  • Dioxygen
The boiling point of water is :
  • $$0^{\circ} C$$
  • $$100^{\circ} C$$
  • $$-0^{\circ} C$$
  • $$-100^{\circ} C$$
$$H_2$$ does not show litmus test. From this, we can say, that the oxide of hydrogen is _______ in nature.
  • acidic
  • neutral
  • basic
  • amphoteric
When water is cooled it contracts until it reaches __________ and then it starts expanding.
  • 37$$^{\circ}$$C
  • 40$$^{\circ}$$C
  • 0$$^{\circ}$$C
  • 4$$^{\circ}$$C
Water is a ______ oxide.
  • acidic
  • neutral
  • basic
  • amphoteric
Distilled water though pure, is not preferred to drink due to its flat insipid taste.
  • True
  • False
Concentration of $$H_{2}O_{2}$$ by vacuum distillation gives hydrogen peroxide which is:
  • about $$99\%$$ pure
  • about $$90\%$$ pure
  • $$30\%$$ pure
  • about $$50\%$$ pure
Electronic configuration of deuterium is _________.
  • $$1s^{2}$$
  • $$1s^{1}$$
  • $$1s^{2}2s^{1}$$
  • $$1s^{2}2s^{2}$$
The melting point of ice on Kelvin scale is:
  • 0 K
  • -273 K
  • 273 K
  • 373 K
A majority of farmers in India depend upon _______ for irrigating their crops.
  • rains
  • tube wells
  • hand pumps
  • canals
Pure water is neutral to litmus.
  • True
  • False
Which element has neither definite shape nor volume?
  • Sodium
  • Hydrogen
  • Iodine
  • Lithium
Which position for hydrogen explain all its properties?
  • At the top of halogens
  • At the top of alkali metals
  • At the top of carbon family
  • None of these
Which of the following is NOT soluble in water?
  • Salt
  • Sugar
  • Oxygen
  • Sand
Water is a kind of _____oxide.
  • acidic
  • basic
  • neutral
  • metal
Water consists of hydrogen and oxygen in the ratio of ______by volume.
  • 1:1
  • 1:2
  • 2:1
  • 3:1
Change of $$H$$ into $${H}^{+}$$ is:
  • oxidation of hydrogen
  • acid base reaction
  • reduction of hydrogen
  • displacement reaction
On Fahrenheit scale, the boiling point of water is:
  • $$100^{\circ}F$$
  • $$80^{\circ}F$$
  • $$212^{\circ}F$$
  • $$32^{\circ}F$$
The $$pH$$ of water is:
  • 9
  • 3
  • 7
  • 4
The density of pure water is:
  • 0.1 g/cm$$^{3}$$
  • 1 g/cm$$^{3}$$
  • 100 g/cm$$^{3}$$
  • 1 kg/cm$$^{3}$$
Pure water is a ______ conductor of electricity.
  • good
  • bad
  • semi
  • none of these
What is the molecular weight of water?
  • 21
  • 18
  • 20
  • 16
Aquatic animals use ______ dissolved in water to respire. 
  • $$\displaystyle { CO }_{ 2 }$$
  • $$\displaystyle { H }_{ 2 }$$
  • $$\displaystyle { O }_{ 2 }$$
  • $$\displaystyle { H }_{ 2 }{ O }_{ 2 }$$
Water is formed by the hydrogen and oxygen combined in the ratio $$ 1 : 9 $$ by weight.
  • True
  • False

Which one of the following is not a physical property of water?
  • Water has low specific heat capacity
  • It expands on cooling
  • It is odorless and tasteless
  • The boiling point of water is $$100^\circ C$$
The chemical formula of ice is:
  • O$$_2$$
  • H$$_2$$O
  • N$$_2$$
  • H$$_2$$
The boiling point of water is inversely proportional to the atmospheric pressure.
  • True
  • False
Pure water has a pleasant taste.
  • True
  • False
The density of water is:
  • $$1\ g/cm$$$$^3$$
  • $$20\ g/cm$$$$^3$$
  • $$2\ g/cm$$$$^3$$
  • $$0.1\ g/cm$$$$^3$$
Hydrogen is a non-metal having __________electron in the valence shell. 
  • 1
  • 2
  • 3
  • 4
Which one of the following property is high in the case of water?
  • Surface tension
  • Specific heat
  • Heat of vaporization and heat of fusion
  • All of the above
Hydrogen exhibits:
  • electropositive character
  • elctronegative character
  • Both A and B
  • None of the above
Which symbol is used for the element hydrogen?
  • $$Hg$$
  • $$He$$
  • $$H$$
  • $$Ho$$
  • $$Hf$$
Water $$\left({H}_{2}O\right)$$ is liquid while all other molecules of equivalent and even higher molecular weight are present in gaseous state because of 
  • Covalent bonding between Hydrogen and Oxygen.
  • Electrostatic attraction among water molecules.
  • Hydrogen bonds.
  • Ionic bonds.
According to recent views, which is the current representation of hydrated proton in aqueous solution?
  • $$H^{+}$$
  • $$H_{9}O_{5}^{+}$$
  • $$H_{9}O_{4}^{+}$$
  • $$H_{3}O^+$$
Among the hydrides given below which are reasonably good acid?
  • $$NH_{3}$$
  • $$HF$$
  • $$HN_{3}$$
  • $$NaH$$
The hydride ion, $$H^{-}$$ is a stronger base than its hydroxide ion $$OH^{-}$$. Which of the following reactions will occur, if sodium hydride $$(NaH)$$ is dissolved in water?
  • $$H^{-}{\left ( aq \right )}+H_{2}O\rightarrow H_{2}O$$
  • $$H^{-}{\left ( aq \right )}+H_{2}O{\left ( l \right )}\rightarrow OH^{-}+H_{2}$$
  • $$H^{-}+H_{2}O\ \rightarrow\ No\ reaction$$
  • $$None\ of\ the\ above$$
In which of the following reaction, dihydrogen acts as an oxidising agent?
  • $$Ca+H_{2}\rightarrow $$
  • $$H_{2}+O_{2}\rightarrow $$
  • $$H_{2}+F_{2}\rightarrow $$
  • $$CuO+H_{2}\rightarrow $$
$$2$$ g of $$Al$$ is treated separately with an excess of dil. $$H_{2}SO_{4}$$ and excess of $$NaOH$$. The ratio of the volume of hydrogen evolved is :
  • $$2:3$$
  • $$1:1$$
  • $$2:1$$
  • $$1:2$$
0:0:1


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