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Prepared by Osama Hasan (Chemistry Instructor and Coordinator NSTC-6 Preparation Programme) for students of Aga Khan Higher Secondary School, Karachi.Could be beneficial for entry test examinations.

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CHEMICAL LANGUAGE

CHEMISTRY TESTNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

TEST O TOPIC

STC PREPARATIO PROGRAMME : 1A DURATIO : CHEMICAL LA GUAGE PREPARED BY

: 45 MI . : OSAMA HASAD) 30g

1. What is the weight of oxygen which occupies 21 litres at S.T.P? A) 45 g B) 50 g C) 60g

2. A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by wt. Therefore the ratio of their number of molecules is? A) 1:4 B) 2:7 C) 7:32 D) 3:16 3. The largest number of molecules is in? A) 36g H2O B) 28g CO C) 46 g C2H5OH D) 54g NO5 4. 1.12 litre of oxygen at .T.P contains 3x1022 molecules. The volume SO2 at .T.P which will contain the same number of molecules? A) 22.4 l B) 1.12 l C) 0.56 l D) 4.44 l 5. Which of the following contains same no. of atoms as 6g of Mg? A) 12 g of carbon B) 4 g of oxygen C) 6 g of O3 D) 27 g of Al

6. 2.4 g of a gaseous compound having same volume as that of 0.4 g of ethane gas. The mol. Wt. of gaseous compound is? A) 180 B) 240 C) 120 D) None 7. The volume occupied by 2g of Helium at S.T.P is? A) 5.6 litres B) 2.8 litres C) 11.2 litres 8. What volume occupied by 14g of 2 at S.T.P? A) 22.5 litres B) 11.2 litres C) 44.8 litres 9. In 0.004g of Mg, the number of atoms is equal to? A) 24 B) 6.02 x 1023 C) 1 x 1023 10. In 18.016 g of H2O, how many molecules are present? A) 1 B) 18.016 C) 6.02 x 1023 11. How many molecules are present in one g of Hydrogen? A) 6.02 x 1022 B) 6.02 x 1023 C) 3.0115 x 1023 D) 84 litres D) 33.6 litres D) 96 D) None D) 3.0125x 1023

12. Which of the following weights the least? A) 24 g of Mg B) 0.9 mole of nitric C) 22.4 l of N2 D) 6.023 x 1024 oxide molecules of O2 13. The number of molecules in 89.9 litres of a gas at OC and 1 atm pressure is? A) 6.023 x 1023 B) 12.04 x 1023 C) 18.06 x 1023 D) 24.08 x 1023 14. 4g of caustic soda contains? A) 6.023 x 1023 atoms B) 4g atoms of of hydrogen sodium C) 6.02 x 1023 atoms of sodium D) 4 moles of Neon1|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]

NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

CHEMICAL LANGUAGE 15. 12g of magnesium on reacting completely with acid gives hydrogen gas, the volumes of which of .T.P would be? A) 22.4 litres B) 11.2 litres C) 44.8 litres D) 6.1 litres 16. One litre of a gas at S.T.P weight 1.16g.It can be possible be? A) C2H2 B) CO C) O2 D) CH4

NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

17. 0.5 mole of BaCl2 is mixed with 0.2 mole of a3PO4.The maximum number of mole of Ba3(PO)4 that can be formed is? A) 0.7 B) 0.5 C) 0.3 D) 0.1 18. 19.7kg of gold was recovered from a smuggler. How many atoms of gold were recovered? A) 100 B) 6.02 x 1023 C) 6.02 x 1024 D) 6.02 x 1025 19. How many formula units are there in a 42g sample of ( H4)2Cr2O7 (formula wt=252)? A) 7.0 x 1023 B) 1x 1023 C) 6 x 1023 D) 1.4 x 1023 20. The number of atoms present in 1 g of hydrogen gas is the same as present in? A) 0.4 g of He B) 22 g of CO2 C) 6 g of H2O D) 12 g of CO 21. The law of multiple proportions is illustrated by? A) KCl and KClO3 B) H2O2 and H2O C) NaBr and Nal 22. In a balanced chemical equation A) atoms are B) molecules are conserved conserved C) moles are conserved D) MnSO4 & MgSO4 D) reactant and product are conserved D) HO2

23. The empirical formula of hydrogen peroxide is? A) H2O2 B) HO C) H2O

24. A hydrogen contains C=80%, H=20%. What is the empirical formula of compound (C=12, H=1) A) CH2 B) CH3 C) CH4 D) C2H6 25. C6H6 contains hydrogen by weight? A) 20% B) 6% C) 24% D) 80%

26. Paracetamol C6H5(OH) HCOOH3 has molecular mass 156. It contains nitrogen by weight? A) 8.9 B) 11.1 C) 14 D) None of them 27. An anti-freeze has empirical formula CH3O. Its molecular mass is 62. What is its molecular formula A) CH3O B) C6H186O62 C) C2H6O D) C2H6O2 28. Which compound doesnt have molecular formula A) NaCl B) N2 C) Cl2 D) HNO3

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NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

CHEMICAL LANGUAGE 29. Which one of the following compound, does not have the empirical formula CH2O A) HCHO B) C6H12O12 C) CH3COOH D) CH3CH2OH 30. A compound contains 87.5% Si and 12.5% H. what is the empirical formula of compound (relative atomic masses H = 1 and Si = 28) B) SiH3 C) SiH4 D) Si2H6 A) SiH2 31. 1 mole of C-12 has mass of? A) 18 B) .9.022 x 10-22 32. One mole of C-12 has mass of? A) 0.012 Kg B) 0.0012 Kg 33. I mole water is equals to? A) 22.4 dm3 B) 18 dm3 C) 6.022 x 1024 C) 1 Kg C) 1 dm3 D) 6.022 x 1023 D) 2 Kg D) none of them

NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

3|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]

NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

CHEMICAL LANGUAGE

CHEMISTRY TESTNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

TEST O TOPIC

STC PREPARATIO PROGRAMME : 1B DURATIO :CHEMICAL TECH IQUES PREPARED BY

: 15 MI . : OSAMA HASAD) Calculation

1. Which of the following is directly related to qualitative analysis? A) Identification B) Separation C) Measurement

2. Which of the following process is used to separate insoluble particles from liquid? A) Separation B) Filtration C) Crystallization D) Condensation 3. The pore size of the filter paper depends upon? A) Nature of medium B) Temp. of medium C) Size of particles D) Mass of particles

4. Which one is the property of an ideal solvent? A) Should be B) React chemically C) Impurities crystallize D) Should be safe to with solute expensive with solute use. 5. If the solvent is inflammable for heating purpose, we use? A) Ice bath B) Water bath C) Wire gauze 6. To prepare the medium sized crystal the hot filtrate is cooled? A) Slowly B) Fast C) Moderately D) Thermostat D) None

7. When a solid which has high vapour pressure at a temperature below its boiling point, is heated, it starts A) Subliming B) Melting C) Decomposing D) Condensing 8. The process of filtration is used to separate A) Solute from B) Insoluble particles C) Two immiscible from liquid solution liquids D) Two miscible liquids

9. In which process solid phase and vapour phase are directly involved? A) Sublimation B) Condensation C) Vaporization D) Filtration 10. In crystallization, the solvent is selected on the basis of? A) Hardness B) Porous nature C) Reactivity 11. After filtration slow cooling yields? A) Bigger & pure B) Bigger & impure crystals crystals C) Smaller & pure D) Hit & trial method D) Smaller & impure D) Distribution D) All of above4|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]

12. Chromatography phenomenon is based on? A) Separation B) Precipitation C) Filtration 13. The technique of chromatography is used in? A) Separation B) Isolation C) Purification 14. Chromatography is important in?

NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

CHEMICAL LANGUAGE A) Quality analysisNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

B) Quantitative

15. Without suction the filtration through filter paper is? A) Rapid B) Slow C) Time consuming 16. Solvent extraction is mostly applied to separate? A) Organic B) Inorganic C) Both A & B compounds compounds 17. Solvent extraction method is used for compounds? A) Volatile B) Thermally C) Both A & B unstable

D) Effective D) None of them

D) None

18. Solvent extraction is an equilibrium process and it is controlled by? B) Law of mass C) Amount of solute D) Amount of A) Distribution law action used solvent

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NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

C) Determination of D) All of above purity of substance

CHEMICAL LANGUAGE

CHEMISTRY TESTNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.

TEST O TOPIC

STC PREPARATIO PROGRAMME : 1C DURATIO : PERIODIC TABLE PREPARED BY

: 30 MI . : OSAMA HASA

1. The valency, ionization energy, electron affinity and Electronegativity of elements are related to its A) Atomic Number B) Properties C) Atomic Weight D) Family Group 2. Which of the following is the most electronegative set of elements? A) N, O, F B) Ca, Sr, Ba C) Na, Mg, Al D) Fe, Co, Ni

3. Which of the following elements has the maximum ionization potential? A) Mg B) Al C) Na D) K 4. Which of the following has lowest first ionization potential? A) B B) C C) N 5. Which has the minimum ionization potential? A) Mg B) AL C) Na D) O D) K D) I D) 6th

6. Excluding H and He, the smallest element in the periodic table is? A) Li B) F C) Cs 7. Which transition series is incomplete? A) 3rd B) 4th C) 5th

8. Which of the following element should be least metallic in character? A) Rb B) In C) Ti D) Po 9. Which of the following will have the largest atomic radius? A) F B) Cl C) Br D) I

10. Which of the following will have the greatest value of Electronegativity when combined with hydrogen? A) Na B) Si C) S D) Cl 11. Which of the following has lowest first ionization potential? A) Na B) F C) I 12. Which of the following is most electronegative? B) Cl C) N A) O D) Cs D) F

13. Which of the following metal require radiation of highest frequency to cause emission of electrons? A) Na B) Mg C) K