CBSE Questions for Class 11 Medical Chemistry Hydrogen Quiz 5 - MCQExams.com

Sea water contains 2.5% of common salt.
  • True
  • False
The density of water at  $$0^{\circ} C $$ is less than the density of water at $$ 4^{\circ}C $$.
  • True
  • False
Why does $$H^+$$ always get associated with other atoms or molecules? 
  • Ionisation enthalpy of hydrogen resembles that of alkali metals.
  • Its reactivity is similar to halogens.
  • It resembles both alkali metals and halogens.
  • Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist freely.
Ice at $$0 \ ^0C$$ has a lower density than water $$4^{\circ}C$$ and hence floats on water.
  • True
  • False
Which group hydrogen has resemblance?
  • I-A
  • II-A
  • IV-A
  • VII-A
Pure water has the maximum density at $$ 4^{\circ} C.$$
  • True
  • False
Pure water is a poor conductor of heat and electricity.
  • True
  • False
In a pressure cooker, the pressure inside increases and hence the boiling point of water decreases thereby food cooks faster.
  • True
  • False
Which of the following statements are not true for hydrogen?
  • It exists as diatomic molecule.
  • It has one electron in its outermost shell.
  • It can lose electron to form a cation which can exist freely.
  • It forms a large number of ionic compounds by losing an electron.
Hydrogen resembles alkali metals in many respect for which several factors are responsible. Of the following factors which one is the most important in this respect?
  • Its tendency to lose electron
  • Its tendency to gain electron in its valence shell
  • It has high ionisation enthalpy.
  • ts small size
Given below are the elements and the type of hydrides formed by them mark the incorrect match.
  • Phosphourus - molecular hydride
  • Potassium - Ionic hydride
  • Vanadium - Interstitial hydride
  • Nitrogen - Electron-deficient covalent hydride
Hydrogen resembles halogen in many respects for which several factors are responsible. Of the following factors which one is the most important in this respect?
  • Its tendency to lose electron
  • Its tendency to gain electron in its valence shell
  • Its low negative electron gain enthalpy
  • Its small size
Hydrogen differs from elements of $$I-A$$ group as:
  • it can form ionic as well as covalent bond
  • all are metals
  • $$ H^+$$ is unstable in water
  • both $$A$$ and $$B$$
The usual valency of hydrogen is:
  • $$-2$$
  • $$0$$
  • $$+1 $$ or sometimes $$-1$$
  • $$+2$$
Among I-A elements, which element is gas at room temperature?
  • Hydrogen
  • Lithium
  • Sodium
  • Potassium
Hydrogen resembles IV-A elements in what respect?
  • All are metals.
  • All are non metals.
  • All are metalloid.
  • They have half-filled electronic configuration.
Among I-A elements which can form ionic as well as covalent bonds? 
  • Hydrogen
  • Cerium
  • Helium
  • Sodium
All of the following are isotopes of hydrogen except:
  • tritium
  • hydronium
  • protium
  • deuterium
Hydrogen differs from elements of I-A group as:
  • hydrogen is gas but others are solid at room temperature
  • all are metals
  • hydrogen is a non-metal but others are metal
  • they donate one electron to become cation
Hydrogen differs from elements of VII-A group as:
  • it can gain one electron
  • it has one electron in its valence shell
  • its electronic configuration is different from other elements
  • both $$B$$ and $$C$$
The element symbol for hydrogen is:
  • K
  • H
  • He
  • Hn
Among I-A elements which is the only non-metal?
  • Hydrogen
  • Lithium
  • Sodium
  • Potassium
Why water is called an universal solvent?
  • Because plants use water for taking minerals from the soil
  • Water can dissolve a wide variety of substances
  • Water is clear and transparent
  • None of the above

Zinc reacts with steam to form a residue which is yellow when hot and white when cold. Guess the residue.
  • $$ZnO_2$$
  • $$ZnO$$
  • $$Zn(OH)_2$$
  • $$ZnH_2$$

Sodium reacts with cold water to form a compound that burns with a flame. Guess the colour of flame.
  • Lilac
  • Golden yellow
  • Brick red
  • White

The uses of water are:
  • It is used as a universal solvent
  • It constitutes a major part of human body
  • It is used for controlling climatic conditions
  • All of the above
Calculate the normality of $$10$$ volume $$H_{2}O_{2}$$:
  • $$1.78\ N$$
  • $$12\ N$$
  • $$30.3\ N$$
  • $$0.0303\ N$$
Among the following elements, which one has the highest ionisation potential?
  • Hydrogen
  • Lithium
  • Potassium
  • Sodium
Which property of water is used by plants for taking minerals from the soil?
I) Water can form aqueous solutions.
II) Water can dissolve a wide variety of substances.
  • I
  • II
  • I, II
  • none of the above
State True or False.
$$H^-$$ is unstable in water.
  • True
  • False
Which property of water make it easy to contaminate and difficult to purify?
  • Water is a universal solvent
  • Tendency to dissolve a large number of substances
  • Both A and B
  • None of the above
Water turns blue cobalt chloride paper:
  • no change
  • red
  • pink
  • orange
Which of the following is a universal solvent?
  • water
  • alcohol
  • acetic acid
  • both A and B
Aquatic plants use $$\displaystyle { CO }_{ 2 }$$ dissolved in water for :
  • breakdown of toxic materials
  • respiration
  • excretion
  • photosynthesis
Is $$\displaystyle { CO }_{ 2 }$$ is more solution in water than $$\displaystyle { O }_{ 2 }$$?
  • Yes
  • No
  • Ambiguous
  • Data insufficient
Ratio of hydrogen to oxygen in water is:
  • $$2:1$$
  • $$1:2$$
  • $$7:1$$
  • $$8:1$$
____ dissolve in water reacts with $$\displaystyle { CaCO }_{ 3 }$$ from rocks to form _______ . 
  • $$\displaystyle { CO }_{ 2 }$$, calcium bicarbonate
  • $$\displaystyle { O }_{ 2 }$$, calcium bicarbonate
  • $$\displaystyle { CO }_{ 2 }$$, calcium carbonate
  • $$\displaystyle { O }_{ 2 }$$, calcium carbonate
Water plays an important role in :
  • hydrological cycle
  • water cycle
  • both A and B
  • none of above
Water exists in which of the following state?
  • solid
  • liquid
  • gas
  • all of above
State True or False.
Water is a compound.
  • True
  • False
Water is ______ in nature.
  • acidic
  • basic
  • neutral
  • none of above
Which of the following is a function of water in our body?
  • Cell life
  • Body temperature regulation
  • Elimination of waste
  • All of above
Metals higher in the reactivity series react with weak alkalies to evolve hydrogen gas.
  • True
  • False
When water gets converted into ice, its volume:
  • increases
  • decreases
  • no change
  • cannot say
The density of water in $$kgm^{-3}$$ is :
  • $$1000$$
  • $$100$$
  • $$10,000$$
  • $$4000$$
Hydrogen is similar to alkali metals in terms of:
  • electronic configuration
  • reducing agent
  • valency
  • all of the above
Hydrogen shows similar properties with halogens. Which of the following properties does not match with the halogens?
  • Electronic configuration
  • Valency
  • Atomicity
  • None of the above
The density of water is maximum at:
  • $$40^oC$$
  • $$4^oC$$
  • $$14^oC$$
  • $$24^oC$$
____________ element has one electron in its outermost shell and attains duplet configuration after one more electron and attains stability.
  • Hydrogen
  • Fluorine
  • Helium
  • Berrylium
Which of the following types of water is not in its free state?
  • River water
  • Well water
  • Distilled water
  • Rain water
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