Here is a vast collection of objective and subjective questions in this question bank of chemistry 12, chapter 01. Following types of questions have been included here.
- MCQs (Textbook Exercise)
- MCQs (Previous Boards Essentials)
- SQs Topic-wise (Previous Boards Essentials + Textbook Conceptuals)
- LQs (Previous Boards Essentials)
You can find solutions to these questions from our publication, “An Insight Into Objective Chemistry-12”.
MCQs (Textbook Exercise)
Q. Each question has four possible answers. Tick the correct one.
01: Keeping in view the size of atoms, which order is the correct one? (MLT-15,16,17)(LHR-15,17,21,22) (DGK-15,22)(RWP-17,19,21,22)(FSL-19)(GJR-19)
(a) Mg>Sr
(b) Ba>Mg
(c) Lu>Ce
(d) Cl>I
02: Mark the correct statement? (LHR-14,15,16,18,19)(DGK-14,16,17)(MLT-14,15,21,22)(BWP-14,19)(SWL-16,17,18,19,21)(RWP-17)(SRG-19)
(a) Na+ is smaller than Na atom.
(b) Na+ is larger than Na atom.
(c) Cl– is smaller than Cl atom.
(d) Cl– (ion) and Cl (atom) are equal in size.
03: Mark the correct statement. (GJR-14)(BWP-17,21)(FSL-19)(MLT-19,22)(AJK-19)
(a) All lanthanides are present in the same group.
(b) All halogens are present in the same period.
(c) All the alkali metals are present in the same group.
(d) All the noble gases are present in the same period.
04: Which statement is incorrect? (SRG-15)(DGK-16,22)(RWP-18)(MLT-19)
(a) All the metals are good conductor of electricity.
(b) All the metals are good conductor of heat.
(c) All the metals from positive ions.
(d) All the metals from acidic oxides.
05: Which statement is correct?
(a) Hydrogen resembles in properties with IA, IVA and VIIA elements.
(b) Hydrogen resembles in properties with IIIA, IVA and VA elements.
(c) Hydrogen resembles in properties with IIA, IVA and VIA elements.
(d) Hydrogen resembles in properties with IIA, IIIA and VIIA elements.
06: Mark the correct statement. (DGK-21)(BWP-22)
(a) The ionization energy of the calcium is lower than that of barium.
(b) The ionization energy of calcium is lower than that of magnesium.
(c) The ionization energy of calcium is higher than that of beryllium.
(d) The ionization energy of calcium is lower than that of strontium.
07: Mark the correct statement.
(a) Electron affinity is a measure of energy required to remove the electron.
(b) Electron affinity is a measure of energy released by adding an electron.
(c) Electron affinity is a measure of energy required to excite an electron.
(d) Electron affinity is a measure of energy released by removing an electron.
08: Mark the correct statement. (BWP-14,15,17)(MLT-17,21)(FSL-21)(SRG-21)(SWL-22)
(a) Metallic character increases down the group.
(b) Metallic character increases from left to right along a period.
(c) Metallic character remains the same from left to right along a period.
(d) Metallic character remains the same down the group.
09: Mark the correct statement.
(a) Melting points of halogens decrease down the group.
(b) Melting points of halogens increase down the group.
(c) Melting points of halogens remain the same throughout the group.
(d) Melting points of halogens first increase and then decrease down the group.
10: Mark the correct statement.
(a) Covalent character of metal halides increases from left to right in a period.
(b) Boiling points of Group IVA hydrides decrease down the group.
(c) Ionic character of hydrides increases from left to right in a period.
(d) The basicity of group IIA oxides decreases on descending down the group.
MCQs (Previous Boards Essentials)
Q. Each question has four possible answers. Tick the correct one.
01: Who gave the ‘Law of Triads’ in 1829? (AJK-16)
(a) Dobereiner
(b) Moseley
(c) Newland
(d) Mendeleev
02: The concept of atomic number was introduced by: (BWP-15)
(a) Al-Razi
(b) Mendeleev
(c) Moseley
(d) Dobereiner
03: The basis of modern periodic table is: (DJK-14)(LHR-14)(MLT-18)
(a) Electron affinity
(b) Atomic mass
(c) Ionization potential
(d) Atomic number
04: Elements of group IIA are called: (FSL-14)(BWP-14)(SWL-18)
(a) Alkali metals
(b) Alkaline earth metals
(c) Coinage metals
(d) Halogens
05: Number of elements in the first period of the periodic table is: (LHR-16)
(a) 2
(b) 8
(c) 14
(d) 18
06: Which is the longest period of the periodic table? (RWP-16)
(a) 4
(b) 5
(c) 6
(d) 7
07: In modern periodic table, 6th period contains elements: (LHR-14)
(a) 8
(b) 18
(c) 10
(d) 32
08: Which of the followings are alkaline earth metals? (LHR-14)
(a) Be, Mg, Ca
(b) Li, Na, K
(c) Fe, Co, Ni
(d) B, Al, Ga
09: Non-metals are present in which block of the periodic table? (GJR-19)
(a) s-block
(b) p-block
(c) d-block
(d) f-block
10: Which one is not a periodic property? (BWP-19)
(a) Ionization energy
(b) Density
(c) Atomic radii
(d) Hydration energy
11: Correct order according to atomic size among the followings is: (MLT-14)
(a) Na>K
(b) Be>Mg
(c) O>N
(d) Cl>F
12: Which of the following elements has the lowest ionization energy? (LHR-14)(SRG-17)
(a) Beryllium
(b) Boron
(c) Carbon
(d) Oxygen
13: Ionization energy of calcium is lower than ___________ element. (FSL-21)
(a) Strontium
(b) Magnesium
(c) Barium
(d) Sodium
14: The element of 2nd period which has the highest I.E. among the followings: (MLT-17)
(a) Be
(b) C
(c) N
(d) O
15: Least melting point will be of __________ element. (GJR-22)
(a) Be
(b) Mg
(c) Ca
(d) Sr
16: Which element has lowest melting point? (LHR-14)(GJR-21)
(a) Beryllium
(b) Magnesium
(c) Calcium
(d) Barium
17: Which of the followings has the highest melting point? (SRG-14)
(a) Aluminium
(b) Silicon
(c) Phosphorus
(d) Sulphur
18: Among alkali metal ions, minimum hydration energy is shown by: (FSL-22)
(a) Li+
(b) Na+
(c) Rb+
(d) K+
19: Which ion will have maximum heat of hydration? (RWP-17)(GJR-17)
(a) Li+
(b) Na+
(c) K+
(d) Mg++
20: Which among the following has highest value of heat of hydration? (SRG-22)
(a) Li+
(b) K+
(c) Mg2+
(d) Al3+
21: The hydrides of group IA are: (SWL-14)
(a) Ionic
(b) Covalent
(c) Metallic
(d) Interstitial
22: Which one is ionic hydride? (RWP-14)
(a) NaH
(b) AlH3
(c) NH3
(d) CH4
23: Which one of the followings is intermediate hydride? (FSL-16)
(a) LiH
(b) MgH2
(c) CaH2
(d) SrH2
24: Which of the following elements forms acidic oxide only? (DGK-14)
(a) Cd
(b) Al
(c) Sn
(d) Br
25: Which element will form amphoteric oxide? (DGK-14,17)
(a) Ca
(b) Fe
(c) Zn
(d) Cu
26: Which one is amphoteric oxide? (BWP-14)(LHR-16)
(a) SO3
(b) CaO
(c) ZnO
(d) Li2O
27: Which among following oxides is amphoteric? (LHR-22)
(a) Na2O
(b) MgO
(c) SO3
(d) ZnO
28: Which one of the following oxides is more basic? (LHR-19)
(a) BeO
(b) SrO
(c) CaO
(d) MgO
29: Which is more acidic oxide among the following? (SRG-19)
(a) MnO
(b) Mn2O3
(c) MnO2
(d) Mn2O7
SHORT QUESTIONS
1.1: INTRODUCTION
Q.01: Define periodic table. How many groups and periods are present in it? (LHR-19)
Q.02: What is Dobereiner’s law of triads? (SWL-17)(AJK-19)
Q.03: What is law of Octaves? (GJR-17)(AJK-18)
Q.04: Differentiate between Mendeleev’s periodic law and modern periodic law? OR
Q.05: Define: (i) Mendeleev’s periodic law (ii) Modern periodic law. (LHR-14,19)
Q.06: Why did Mendeleev leave some gaps in his periodic table?
Q.07: What were the defects of Mendeleev’s periodic table? (BWP-22)
Q.08: What were the improvements made in Mendeleev’s periodic table?
Q.09: Zn, Cd and Hg were placed with alkaline earth metals in Mendeleev’s periodic table. How was this confusion removed in modern periodic table? (LHR-14)(MLT-16,17,18)(FSL-18)
Q.10: What are groups and periods? (AJK-14)
Q.11: Give essential features of period 4 in modern periodic table. (SWL-18)
Q.12: Write essential features of 4th and 5th periods in periodic table. (BWP-21)
Q.13: What are Lanthanides and Actinides? (SRG-19)
Q.14: Describe some families in periodic table. (BWP-21)
Q.15: What are s and p-block elements? OR What do you know about s-block elements? (DGK-21)
Q.16: Differentiate between d and f-block elements.
Q.17: d and f-block elements are called transition elements. Give reason. (DGK-16,18)(SRG-22)
Q.18: How the classification of elements in different blocks helps in understanding their chemistry? (GJR-18)
Q.19: Differentiate between metals and non-metals.
Q.20: What are metalloids?
Q.21: Why does the atomic radius decrease from left to right in a period while increase from top to bottom in a group?
Q.22: Define atomic radius. Why atomic radius of group IA elements increase down the group? (MLT-17,18)
Q.23: What is lanthanide contraction? How does it control the sizes of the elements of 6th and 7th periods? (LHR-16)(RWP-17,18)(MLT-19)(SWL-19)(SRG-21)(GJR-22)(AJK-22)
Q.24: Lanthanide contraction controls the sizes of the elements of 6th and 7th periods. Give reason. (LHR-22,22)
Q.25: Why is ionic radius of a positive ion always smaller than the parent atom? (DGK-17)(FSL-22)
Q.26: Why Na+ is smaller than Na atom? (DGK-21)
Q.27: Why the size of anion is larger than the neutral atom? OR Why the ionic radii of negative ions are larger than the size of their parent atoms? (DGK-14)(MLT-14,15,22)(GJR-15,21)(FSL-16,21)(SRG-17,17)(BWP-17,18,22)(LHR-17,18,21)(AJK-18)(RWP-18)(SWL-21)
Q.28: Define ionization energy. On which factors does it depend?
Q.29: Define ionization energy. How does it vary in the periodic table? (DGK-21)
Q.30: Why is first ionization energy of Mg greater than that of Na? (DGK-17)(LHR-18)
Q.31: Why the second value of ionization energy is always greater than the first ionization energy values? (RWP-21)
Q.32: Why does ionization energy increase along the period while decrease down the group? OR Why the values of ionization energy decrease down the group? (LHR-14,18)(GJR-14,19)(BWP-15)(AJK-16)(DGK-17)(MLT-19,22)
Q.33: What is meant by shielding effect? (BWP-14)
Q.34: What is the role of shielding effect on ionization energy? (BWP-18)(GJR-21)
Q.35: Why ionization energy of inert gases is maximum along the period? (SWL-22)
Q.36: Define electron affinity with example. Give its trend in the periodic table. OR How does electron affinity vary in a group of the periodic table? (SWL-16,21)(MLT-21)(GJR-21)
Q.37: Why is the second electron affinity of an element is positive? OR The first electron affinity of oxygen is negative but the second is positive. Justify it. (MLT-14,21,22)(LHR-14)(RWP-16)(GJR-17,22)(BWP-17,19)(FSL-17,18,19)
Q.38: Why do metals conduct electricity? (LHR-14,17)(BWP-18)
Q.39: Why does metallic character increase from top to bottom in a group? (LHR-14,15,18)(SRG-16,22)(DGK-16,17,22)(FSL-19,22)(MLT-19)(RWP-19)(GJR-22)(AJK-22)
Q.40: Explain the variation of melting points along short periods. (LHR-22)(MLT-22)
Q.41: The melting and boiling points of the elements in short periods increase up to the middle of the period and then decrease. Why? (SWL-14)(DGK-15)(MLT-18)(GJR-21)
Q.42: Why do the boiling points of halogens increase down the group in periodic table? (RWP-18)
Q.43: Melting points of group VIIA increase down the group. Why? (SRG-16)
Q.44: The oxidation states vary in a period but remain almost constant in a group. Explain. (SRG-16)(LHR-16,22)(RWP-17,17)(GJR-18)(BWP-19) .Ex.Q.14(d).
Q.45: Why is the oxidation state of noble gases usually zero? (GJR-14,15,22)(LHR-14,18)(MLT-15)(AJK-15)(FSL-17)(SRG-18)(DGK-19,22)
Q.46: Why is diamond a non-conductor while graphite is a good conductor? OR Why the graphite is a good conductor? (FSL-14,21)(DGK-14,15,18,22)(RWP-14)(BWP-15,18)(SWL-17)(MLT-17,18,21)(LHR-18,19,21)(GJR-18)(SRG-18)(AJK-19)
Q.47: Define hydration energy of ions with an example. (BWP-14)(SRG-14)(MLT-17)(DGK-17,21)(RWP-18)(LHR-19)
Q.48: Why does hydration energy of ions increase from left to right in a period, while decrease from top to bottom in a group? OR Hydration energy decreases in the group from top to bottom, why? OR Hydration energy depends on the charge density of ion. Justify the statement. (GJR-14)(SRG-18)
Q.49: The hydration energies of ions are in the order of Al3+>Mg2+>Na+. Explain with reason. OR Give reasons that the hydration energy of Al3+ ions is more than that of Mg2+ ions. (MLT-16,17)(LHR-17,18)(DGK-18)(SWL-19,22)(AJK-21)(RWP-21)(SRG-21)
1.4: PERIODIC RELATIONSHIP IN COMPOUNDS
Q.50: What are halides? Give their types. (MLT-18)
Q.51: What are polymeric halides? Give examples. (FSL-22)
Q.52: Why does ionic character of halides decrease from left to right in a period? (MLT-19)(BWP-19,19)(AJK-21)
Q.53: PbCl2 is mainly ionic, but PbCl4 is fairly covalent, why?
Q.54: Define hydrides. Name various classes of hydrides. (LHR-16)
Q.55: Differentiate between hydrides and halides. (DGK-22)
Q.56: What are ionic hydrides? Give examples. (SRG-16)
Q.57: Alkali metals form ionic hydrides. Explain. (LHR-16)(SRG-17,19)(MLT-18)
Q.58: Define covalent hydrides with one example. (GJR-19)
Q.59: Write two properties of covalent hydrides. (DGK-16)(SWL-18)(SRG-19)
Q.60: Differentiate between basic and acidic oxides.
Q.61: Na2O is basic while P2O5 is acidic in character. Justify. (FSL-14,18)(BWP-18)(SWL-18)
Q.62: What are amphoteric oxides? Give two examples. (FSL-19)
Q.63: Prove that ZnO is an amphoteric oxide. OR Why ZnO is regarded as amphoteric oxide?
(LHR-14,17,18)(DGK-14,19)(GJR-14,19)(MLT-16)(RWP-17)(SRG-18)(BWP-18)(FSL-22)
1.5: POSITION OF HYDROGEN:
Q.64: How does hydrogen resemble with alkali metals? OR How do you justify the position of hydrogen at the top of group IA? (SWL-14,18)(LHR-16)(BWP-16)(MLT-16,16)(FSL-19)
Q.65: Give two dissimilarities of hydrogen with IA elements. (DGK-16)(BWP-16)
Q.66: Give similarities of hydrogen with group VIIA? OR How do you justify the position of hydrogen at the top of group VIIA? (RWP-19)
Q.67: Give some differences of hydrogen with group VIIA.
Q.68: Give two resemblances of hydrogen with group IVA elements. (LHR-16)(FSL-16)(GJR-18)(SRG-19)(MLT-21)
Q.69: Give some differences of hydrogen with group IVA?
LONG QUESTIONS
1.1: INTRODUCTION
Q.01: What are the improvements made in Mendeleev’s periodic table? (LHR-14,17,22)(SWL-16)(DGK-16)(MLT-16,18)(GJR-19)(FSL-19)(SRG-19)(BWL-19)(RWP-22)
1.2: THE MODERN PERIODIC TABLE.
Q.02: Define groups and periods. Discuss 6th and 7th periods of the periodic table. (DGK-16)(MLT-17)
Q.03: What are periods? Explain various periods of the periodic table. (RWP-17)
Q.04: Write the essential features of all periods in periodic table. (RWP-21)
Q.05: Explain main features of modern periodic table. (MLT-14)(SWL-18)
Q.06: How does the classification of elements in different blocks help in understanding their chemistry? (SRG-19)
1.3: PERIODIC TRENDS IN PHYSICAL PROPERTIES.
Q.07: Explain periodic trend in following properties: i) Atomic radius ii) Electron affinity (LHR-14)
Q.08: Define ionization energy. How does it vary in groups and periods of the periodic table? (SRG-16)(BWP-17)(GJR-17,21)( RWP-18)(AJK-21)(SWL-22)(FSL-22)
Q.09: Define ionization energy. On what factors does it depend? Give its trend. (SRG-21)
Q.10: Write a comprehensive note on ionization energy. (AJK-22)
Q.11: Define electron affinity. How does it vary in groups and periods in the periodic table? (SRG-17)(MLT-19)(BWP-21)
Q.12: Describe the trend of metallic character in groups and periods and discuss the impact of atomic size on it. (DGK-14)(BWL-18)
Q.13: Explain periodic trends in the following physical properties: (i) Ionization energy (ii) Metallic character. (GJR-22)
Q.14: Discuss periodic trend in the properties of elements: (i) Melting points in groups and periods (ii) Boiling points in groups and periods. (DGK-21)
Q.15: Describe variation of melting and boiling point in periods and groups of modern periodic table. (FSL-21)
Q.16: Discuss the oxidation states of different elements in the periodic table. (FSL-16)
Q.17: Discuss variations of electrical conductance in groups and periods in periodic table. (BWL-17)
Q.18: Define hydration energy with an example. Give its variation in periodic table. (MLT-22)
Q.19: Explain hydration energy as periodic property. (GJR-19)
1.4: PERIODIC RELATIONSHIP IN COMPOUNDS.
Q.20: What are halides? Classify them on the basis of nature of bonding. Discuss covalent halides in detail. (LHR-14)
Q.21: What are hydrides? Classify them on the basis of nature of bonding. Explain only ionic hydrides in detail. (LHR-14,18,19)(FSL-14)(RWP-17)(SRG-18)
Q.22: What are hydrides? Write down their classification and the properties of covalent hydrides. (MLT-19)
Q.23: Define oxides. Classify oxides on the basis of their acidic and basic character. (RWP-22)
Q.24: What are oxides? Describe various types of oxides. (BWL-19)
Q.25: What are oxides? Explain their oxides along the short periods. (MLT-22)
Q.26: Write a note on oxides of different elements in periodic table. (SWL-14)(DGK-16)(MLT-18)
1.5: THE POSITION OF HYDROGEN.
Q.27: Give the differences of hydrogen with group IA, IVA and VIIA elements in the periodic table. (MLT-21)
Q.28: Discuss the position of hydrogen at the top of group IA. (GJR-15)(FSL-22)
Q.29: Justify the position of hydrogen at the top of group IA by giving any four points of similarities and dissimilarities. (SWL-21)
Q.30: Give two similarities and two dissimilarities of hydrogen with elements of group IA. (FSL-19)(DGK-19)
Q.31: Justify the position of hydrogen at the top of groups IA and IVA. (MLT-21)
Q.32: Discuss the position of hydrogen over IA and VIIA of periodic table. (RWP-19)
Q.33: Discuss analogy (resemblance) of hydrogen with group IA and VIIA. (LHR-17)
Q.34: Discuss the position of hydrogen over group VIIA. (GJR-14)(BWP-14)(DGK-17,22)(MLT-18)(LHR-19)(AJK-19)
Q.35: Write any two similarities and two differences between hydrogen and halogens. (SWL-19)(LHR-22)
Q.36: Write similarities and differences of halogens with hydrogen. (DGK-21)
Q.37: Explain similarities of hydrogen with Halogens, and dissimilarities with Alkali Metals. (BWP-22)
Q.38: Discuss the position of hydrogen with carbon family, giving their similarities and dissimilarities. (SRG-15)(AJK-16)(LHR-21)(DGK-22)
Q.39: Discuss two similarities and two differences of hydrogen with group IV A elements. (SRG-22)
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