CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020 |_00.1
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CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020

CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020 |_20.1

Q1. Which of the elements show the least ionization energies within their periods?
कौन-सा तत्व अपनी आवर्ती सारणी में सबसे कम आयनीकरण ऊर्जा दिखाता है?
(a) Alkaline earth / क्षारीय पार्थिव
(b) Alkali metals/ क्षार धातुएँ
(c) Noble gases/ उत्कृष्ट गैस
(d) Halogens / हैलोजन

Q2. The correct order of the size of C, N, P, and S follows the order
C, N, P और S के आकार के अनुसार सही क्रम है:
(a) N < C < P < S
(b) C < N < S < P
(c) C < N < P < S
(d) N < C < S < P

CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020 |_30.1

Q4. Which of the following elements represents highly electropositive as well as highly electronegative element in its period?
निम्न में से कौन-सा तत्व अपनी आवर्ती सारणी में अत्यधिक विद्युत-धनात्मकता के साथ-साथ अत्यधिक विद्युतऋणात्मक तत्व का भी प्रतिनिधित्व करता है?
(a) Nitrogen/ नाइट्रोजन
(b) Fluorine / फ्लोरीन
(c) Hydrogen / हाइड्रोजन
(d) None of these/ इनमें से कोई नहीं

Q5. In general, ionization energy does not increase with
सामान्य तौर पर, आयनीकरण ऊर्जा नहीं बढ़ती है:
(a) Decrease in size of the atom/ परमाणु के आकार में कमी के साथ
(b) Increase in nuclear charge / नाभिकीय के आवेश में वृद्धि के साथ
(c) Increase in shielding effect / परिरक्षण प्रभाव में वृद्धि के साथ
(d) Stability of electronic configuration / इलेक्ट्रॉनिक कॉन्फ़िगरेशन की स्थिरता के साथ

Q6. Iso-electronic ions are those which have
आइसो-इलेक्ट्रॉनिक आयन वे होते हैं:
(a) Same size / जिनका आकार समान होता है
(b) Same ionization energy/ जिनमें समान आयनीकरण ऊर्जा होती है
(c) Same electronic configuration / जिनमें समान इलेक्ट्रॉनिक कॉन्फ़िगरेशन होते हैं
(d) Same nuclear charge / जिनके पास एक ही नाभिकीय चार्ज होता है

Q7. The ionization energy decrease in moving down a group. This is due to
एक समूह को नीचे ले जाने में आयनीकरण ऊर्जा कम हो जाती है. इसका कारण है
(a) increase in nuclear charge only/ केवल नाभिकीय आवेश में वृद्धि
(b) increase in atomic size and nuclear charge / परमाणु आकार और नाभिकीय आवेश में वृद्धि
(c) increase in nuclear charge and decrease in shielding effect / नाभिकीय आवेश में वृद्धि और परिरक्षण प्रभाव में कमी
(d) increase in atomic size and also shielding effect/ परमाणु आकार और प्रभाव परिरक्षण में वृद्धि

Q8. The increasing order of I.E. among sulphur, phosphorus and oxygen is
सल्फर, फास्फोरस और ऑक्सीजन के बीच I.E. का बढ़ता क्रम है:
(a) S < P < O
(b) P < S < O
(c) O < S < P
(d) O < P < S

Q9. Which of the following does not affect the ionization potential of the atom?
निम्नलिखित में से कौन परमाणु की आयनीकरण क्षमता को प्रभावित नहीं करता है?
(a) Nuclear charge/ नाभिकीय आवेश
(b) Electron neutrality with protons / प्रोटॉन के साथ इलेक्ट्रॉन की निष्क्रियता
(c) Penetration effect / पेनेट्रेशन प्रभाव
(d) Atomic size / परमाणु का आकार

CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020 |_40.1

Solutions

S1. Ans.(b)
Sol. Alkali metals have the lowest ionization energy in each period and this is because they are having the largest atomic size in their respective period.

S2. Ans.(d)
Sol. Atomic size decreases across a period and increases down a group.

CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020 |_50.1

S4. Ans.(c)
Sol. First period has only two elements viz. H and He. Out of these two he has not tendency to loose or gain any electron. As such it is the element which represents highly electropositive and electronegativity elements.

S5. Ans.(c)
Sol. the more inner shells there are, the shielding effect will increase. This decreases the overall attraction between nucleus and valence electron, less energy is required to remove the electron, and hence ionization energy will decrease.

S6. Ans.(c)
Sol. Isoelectronic refers to two atoms, ions, or molecules that have the same electronic structure and the same number of valence electrons. The term means equal electric or equal charge.

S7. Ans.(d)
Sol. Due to an increase in the shielding effect and in the atomic radius the ionization energy decreases in moving down a group.

S8. Ans.(a)
Sol. S < P < O

S9. Ans.(b)
Sol. Factors affecting ionization potential:
1. Atomic radius: the larger the atomic radius, the smaller the attraction of the outer shell electrons to the nucleus so the ionization energy is lower reduced as atomic radius increases.
2. Nuclear charge: the higher the nuclear charge the larger the nuclear attraction of the outer electrons so the ionization energy increases.
3. Electron shielding: the more inner shells of electrons there are, the larger the shielding effect and the nuclear attraction is decreased so ionization energy increases.

S10. Ans.(d)
Sol. Na+ is small in size because it is cation. As cation are smaller in size as compared to neutral atom and anion.

CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020 |_60.1CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020 |_70.1CTET 2020: Chemistry Questions based on Classification of Elements : 4th February 2020 |_80.1

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