Chemistry MCQs for class 12 unit 1 with answer keys. Periodic classification of elements and periodicity. All MCQs from past papers of intermediate Board of Lahore, Gujranwala, Multan, Federal Board, Rawalpindi, Sahiwal, Dgkhan, Bahawalpur.
Chemistry MCQs For class 12 chapter 1
CHAPTER 01 Periodic Classification of Elements and Periodicity
MULTIPLE CHOICE QUESTIONS (MCO’s) (From Previous Board Papers 2014-2015-2016-2017-2018, 2019, 2020,2021, 2022, 2023)
1. The concept of atomic number was introduced by: (BWP. GI, 2015)
(A) Alrazi
(B) Mendeleev
(C) Moseley
(D) Dobereiner
2. In the modern periodic table 6th period contains elements?
(A) 8
(B) 18
(C) 10
(D) 32
3. Which of the following are alkaline earth metals? (LHR. GII, 2014)
(A) Be, Mg, Ca
(B) Li, Na, K
(C) Fe, Co, Ni
(D) B, AI, Ga
4. The hydrides of Group TA are. (SWL. GI, 2014)
(A) lonic
(B) Covalent
(C) Metallic
(D) Interstitial
5. Which one is an ionic hydride? (RWP. GI, 2014)
(A) NaH
(B) ACH3
(C) NH3
(D) CH4
6. Which one is an incomplete period? (BWP. GI, 2016)
(A) 4th
(B) 5th
(C) 6th
(D) 7th
7. Number of elements in the first period of the periodic table is: (LHR. GI, 2016)
(A) 2
(B) 8
(C) 14
(D) 18
8. Which is the longest period of the periodic table: (RWP. GI, 2016)
(A) 4
(B) 5
(C) 6
(D) 7
9, Which one is amphoteric oxide? (BWP. GI, 2014) (LHR. GII, 2016)
(A) SO3
(B) CaO
C Zno
(D) Li20
10. Which of the following statement is correct? (DGK. GI, BWP. GI, LHR. GI, 2014)
(LHR. GI, MLN. GI, 2015) (RWP. GII, SWL. GI, 2017)
(A) Na atom is smaller than Na+
(B) Na atom is larger than K atom
(C) F atom is smaller than F
(D) Fatom is larger than F
11. Which order is the correct for the size of atoms? (GRW. GI, 2014) (LHR. GI, MLN. GII, DGK. GI, GRW.GI, 2015) (MLN. GI, SGD. GI, 2016) (LHR. GII, RWP. GI, GRW.CI, MLN. GI, 2017) (LHR. GI, MLN. 2018)
(A) Mg > Sr
(B) Ba > Mg
(C) Lu> Ce
(D) CI>I
Which oxide is amphoteric in nature. (FBD. GI, 2015)
(A) Al203
(B) Cl207
(C) Mgo
(D) SO3
13. Which of the following element has the lowest- ionization energy? (LHR. GI, 2014) (SGD. GI, 2017)
(A) Beryllium
(B) Boron
(C) Carbon
(D) Oxygen
14. Which element has the lowest melting point: (LHR. GI, 2014)
(B) Magnesium
(A) Beryllium
(C) Calcium
(D) Barium