Chemistry IJSO Stage-1

7/23/2019 Chemistry IJSO Stage-1

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SUBJECT : CHEMISTRY DPP :

TOPIC : MOLE CONCEPT I

1. The total number of protons in 10g of calcium carbonate is (NO = 6.023 1023

)(A) 1.5057 10 24 (B) 2.0478 1023 (C) 3.0115 1024 (D) 4.0956 1024

2. Which of the following has the highest mass ?

(A) 1g atom of C (B)2

1mol of CH

4

(C) 10 ml of water (D)3.0111023 atoms of oxygen

3. 12 of H2and 11.2 of Cl

2are mixed and exploded. The composition by volume of mixture is -

(A) 24 of HCl (g) (B) 0.8 Cl2

and 20.8 HCl(g)

(C) 0.8 H2and 22.4 HCl(g) (D) 22.4 HCl(g)

4. Copper metal reacts with nitric acid, according to the reaction

3Cu(s) + 8HNO3(aq)3Cu(NO

3)

2(aq) + 2NO(g) + 4H

2O()

If 18.75 g Cu(NO3)2 is eventually obtained, then how many grams of nitric oxide, would have also formedaccording to the preceeding equation ?

(A) 2g (B) 4g (C) 6g (D) 8g

5. A spherical ball of radius 10 cm contains 56% iron. If density is 1.2 g/cm3 , number of mol of Fe present

approximately is -

(A) 24 (B) 20 (C) 50 (D) 25

6. On heating O3its volume :

(A) remains unchanged (B) becomes doubled

(C) becomes half (D) becomes2

3times

7. Number of water molecules in the drop of water, if 1 ml of water has 20 drops and A is Avogadros number

is -(A) 0.5 A/18 (B) 0.05 A (C) 0.5 A (D) 0.05A/18

8. N2+ 3H

2 2NH

3, molecular weight of NH

3and N

2are x

1and x

2, their equivalent weight are y

1and y

2.

Then (y1 y

2) is -

(A)6

xx2 21(B) x

1 x

2(C) 3x

1 x

2(D) x

1 3x

2

Read the following passage carefully and answer the questions given after the passage.

Milk of sulphur is soluble in CS2and mainly used in medicine. A doctor wants to produce 6.4 kg milk of

sulphur , so he went to laboratory and took milk of lime [Ca(OH)2] with sulphur and again decomposing

the products formed with HCl, milk of sulphur i.e. , white sulphur is formed. Reaction involving in the

production of white sulphur are -

2CaS5+ CaS

2O

3+ 6HCl 3CaCl

2+ 3H

2O + 12S

(white)

9. Doctor wants to produce

(A) 1. 2046 1026 sulphur atom (B) 1.2046 1023 white sulphur atom

(C) 6.023 1023 sulphur atom (D) 1. 2046 1026 white sulphur atom

10. How many mole of Ca(OH)2is used for the production of 6.4 kg of milk of sulphur ?

(A) 0.50 mole (B) 0.80 mole (C) 50 mole (D) 80 mole

11. How many mole of HCl is used in this process ?

(A) 100 mole (B) 200 mole (C) 10 mole (D) 20 mole

12. When milk of lime is reacted with sulphur, the oxidation state of sulphur changes from zero to -

(A) 2/5 (B) 2/5 and +2 (C) +2 (D) +2 and +4

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TOPIC : , BASES AND SAL

1. What volume of a solution of hydrochloric acid containing 73g of acid per litre would sufficient for the exact

neutralization of sodium hydroxide obtained by allowing 0.46 g of metallic sodium to act upon water ?

(A) 20 m (B) 15 m (C) 10 m (D) 25 m

2. What volume of 0.1 M H2SO

4must be added to 50 ml of a 0.1 M NaOH solution to make a solution in

which the molarity of the H2SO

4is 0.050 M ?

(A) 400 m (B) 50 ml (C)100 m (D) 150 m

3. The density (in g m1) of a 3.60 M sulphuric acid solution that is 29% by mass will be -

(A) 1.22 (B) 1.45 (C) 1.64 (D) 1.88

4. 2g sample containing Na2CO

3and NaHCO

3loses 0.248 g when heated to 300C, the temperature at

which NaHCO3decomposes to Na

2CO

3and H

2O. What is the % of Na

2CO

3in the mixture ?

(A) 33.6% (B) 67.4% (C) 67.2% (D) 32.8%

5. In which of the following term mass of solvent is used ?

(A) Molarity (B) Molality (C) Solubility (D) Both (B) and (C)

6. 300 ml of 3M NaCl is added to 200 ml of 4M BaCl2solution. The concentration of Cl ions in the resulting

solution is -

(A) 7 M (B) 1.6 M (C) 1.8 M (D) 5 M

7. The volume of water to be added to 100 cm3 of 0.5 N H2SO

4to get deci normal concentration is :

(A) 100 cm

3

(B) 450 cm

3

(C) 500 cm

3

(D) 400 cm

3

8. Salt solution of sodium bicarbonate is -

(A) Basic (B) Acidic

(C) Neutral (D) Depends on concentration

9. Which of the following will released hydrogen when reacts with sodium ?

(A) HCl (B) C2H

5OH (C) C

2H

2(D) All of these

10. pH of a solution prepared by mixing 25 ml of 0.05 M solution of HCl, 10 mL of 0.5 NaOH, 50 mL of 0.05 M

solution of H2SO

4and 15 ml of water will be -

(A) 12.903 (B) 1.903 (C) 12.097 (D) 1.097

11. The pH of a solution of 0.1 M CH3COOH increases when which of the following substance is added ?

(A) NaHSO4

(B) HClO4

(C) NH4NO

3(D) K

2CO

3

12. 105 M NaOH solution at 25C is diluted 1000 times. The pH of the solution will -

(A) be equal to 8 (B) lie between 7 and 8 (C) lie between 6 and 7 (D) remain unchanged

13. The number of H+ ions present in 1 ml of a solution having pH = 13 is -

(A) 1013 (B) 6.023 1013 (C) 6.023 107 (D) 6.023 1010

14. The pH of aqueous solutions of three acids A, B and C respectively is 3, 2 and 1. What will be the ratio of their

[H+] ?

(A) 1 : 2 : 3 (B) 300 : 200 : 10 (C) 100 : 10 : 1 (D) 1 : 10 : 100

15 10 mL of 0.1 N HCl is added to 990 mL solution of NaCl. The pH of the resulting solution is-

(A) zero (B) 3 (C) 7 (D) 10

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TOPIC : STRUCTURE OF ATOM

1. Which is the correct statement about a proton ?(A) It is nucleus of deuterium. (B) It is ionised hydrogen molecule.

(C) It is ionised hydrogen atom. (D) It is alpha particle.

2. Match List-I with List-II and select the correct answer using the codes given below the lists ( and m are

respectively the azimuthai and magnetic quantum no.)

List-I List-II

(A) Number of value of for an energy level (1) 0, 1, 2, ............. (n - 1)

(B) Value of for a particular type of orbital (2) + to through zero

(C) Number of values of m for = 2 (3) 5

(D) Value of 'm' for a particular type of orbitals (4) n

3. The atoms of various isotopes of a particular element differ from each other in the number of -

(A) electron in the outer shell only (B) protons in the nucleus

(C) electrons in the inner shells only (D) neutrons in the nucleus

4. An electron in an atom -

(A) moves randomly around the nucleus.

(B) has fixed space around nucleus.

(C) is stationary in various energy levels.

(D) moves around its nucleus in definite energy levels.

5. S1

: Bohr model is applicable for Be2+ ion.

S2: Total energy coming out of any light source is integral multiple of energy of one photon.

S3: Number of waves present in unit length is wave number.

S4: q/m ratio in cathode ray experiment is independent of the nature of the gas.

(A) F F T T (B) T T F F (C) F T T T (D) T F F F

6. Choose the correct statement among the following -

(A) Thomson atomic model is also known as plum-pudding model.

(B) Rutherford atomic model led to the discovery of the nucleus.

(C) According to Bohrs atomic model , electrons revolve around the nucleus in well defined orbits.

(D) All statements are correct.

7. Atomic number -

(i) is denoted by Z.

(ii) is no. of protons in an atom.

(iii) is no. of electrons in charged atom.

(iv) is equal to sum of protons and neutrons in an atom.

Correct statement is -

(A) (i) to (iv) all (B) (i) and (ii) only (C) (ii) and (iv) only (D) (iii) and (iv) only

8. For the energy levels in an atom which one of the following statement is correct ?

(A) The 4s sub-energy level is at a higher energy than the 3d sub-energy level.

(B) The M- energy level can have maximum of 32 electrons.(C) The second principal energy level can have four orbitals and contain a maximum of 8 electrons.

(D) The 5th main energy level can have maximum of 50 electrons.

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9. The order of increasing energies of the orbitals follows -

(A) 3s, 3p, 4s, 3d, 4p (B) 3s, 3p, 3d, 4s, 4p

(C) 3s, 3p, 4s, 4p, 3d (D) 3s, 3p, 3d, 4p, 4s

10. The number of electrons in an atom with atomic number 105 having ( n+ )=8 is

(A) 15 (B) 17 (C) 19 (D) 21

11. In Cu ( Atomic no. 29 )

(A) 13 electrons have spin in one direction and 16 electrons in other direction.

(B) 14 electrons have spin one direction and 15 electrons in other direction.

(C) one electron can have spin only in the clockwise direction.

(D) none of the above is correct.

12. Consider the ground state of Cr atom.The number of electrons with the azumithal quantum numbers

= 1 and 2 are respectively-

(A) 12 and 4 (B) 12 and 5 (C) 16 and 4 (D) 16 and 5


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T ABLE

1. Without looking at the periodic table, select the elements of IIIA group of the periodic table (atomicnumbers are given) :

(A) 3, 11, 19, 37 (B) 5, 13, 21, 39 (C) 7, 15, 31, 49 (D) 5, 13, 31, 49

2. Which pair is different from the others :

(A) Li Mg (B) B Si (C) Be Al (D) Li Na

3. Which of the following series of elements have nearly the same atomic radii ?

(A) F, Cl, Br, I (B) Na, K, Rb, Cs (C) Li, Be, B, C (D) Fe, Co, Ni, Cu

4. The elements having highest ionization enthalpies within their periods are called -

(A) halogens (B) noble gases (C) alkali metals (D) transition elements

5. The correct order of size among Cl, Cl+ and Cl is -

(A) Cl+ < Cl < Cl (B) Cl+ > Cl > Cl (C) Cl+ < Cl < Cl (D) Cl < Cl < Cl+

6. Which of the following properties generally decreases along a period ?

(A) Ionisation energy (B) Atomic radii (C) Electron affinity (D) Valency

7. The correct order of increasing atomic radius of the following elements is

(A) S < O < Se < C (B) O < C < S < Se (C) O < S < Se < C (D) C < O < S < Se

8. The electron affinities of halogens are :

F = 332, Cl = 349, Br = 324, I = 295 kJ mol1

The higher value of Cl as compared to that of F is due to :

(A) higher atomic radius of F (B) smaller electronegativity of F(C) weaker electron repulsion in Cl (D) more vacant p-subshell in Cl

9. In the modern periodic table which one of the following does not have appropriate position ?

(A) Inert gases (B) Inner-transition elements

(C) Transition elements (D) Fluorine

10. Element of which of the following atomic nos. has lowest EN?

(A) 37 (B) 55 (C) 87 (D) 105

11 Match the following :

Column-I Column-II

(element/ elements) (group number)(A) An element whose fourth shell contains two p-electrons (p) 8th group

(B) An element whose valence shell contains one unpaired p-electron (q) 12th group

(C) An element which receives last electron in(n 1) d-subshell (r) 14th group

(D) An element with the ground-state electron configurationa[Ar]4s23d10 (s) 17th group

12. Arrange the following in increasing radii

(a) Li+, Na+, K+ (b) K+, Ca2+, Ar

(c) Mg, Mg+, Mg2+ (d) O2, N3, F

(e) O, O, O2 (f) Mg2+, Ca2+

(g) Na+

, Ne (h) P3

, N3

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TOPIC : NUCLEAR CHEMISTR

1. Radioactivity is due to -(A) stable electronic configuration (B) unstable electronic configuration

(C) stable nucleus (D) unstable nucleus

2. -rays have ionisation power because they possess -

(A) lesser kinetic energy (B) higher kinetic energy

(C) lesser penetration power (D) higher penetration power

3. A magnet will cause greatest deflection of -

(A) -rays (B) -rays (C) -rays (D) neutrons

4. The ionising power of , and rays is in the decreasing order -

(A) > > (B) > > (C) > > (D) > >

5. Which of the following radiation have least effect on both the photographic plate and zinc sulphide screen ?

(A) -rays (B) -rays (C) - rays (D) All have equal effect

6. In -decay n/p ratio -

(A) may increase or decrease (B) remains constant

(C) decreases (D) increases

7. U23892 emits an alpha particle, the product has mass number and atomic number -

(A) 236, 92 (B) 234,90 (C) 238, 90 (D) 236, 90

8. The isotope U23592 decays in a number of steps to an isotope of Pb20782 . The groups of particles emitted in

this process will be -

(A) 4 , 7 (B) 6, 4 (C) 7, 4 (D) 10, 1

9. When Ra22688 emits an -particle , the new element formed belongs to -

(A) third group (B) zero group (C) fourth group (D) second group

10. The U23892 disintegrates to give 4 and 6 particles. The atomic no. of the end product is -

(A) 92 (B) 96 (C) 84 (D) 90

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Ques 1 2 3 4 5 6 7 8 9 10 11 12

Ans C A C A C D D A D C A B

Ques 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Ans C C A B D D D A D B D B C D B

Ques 1 2 3 4 5 6 7 8 9 10

Ans A C B D B B B C B C

Ques 1 2 3 4 5 6 7 8 9 10 11 12

Ans C D D C D B C A B B B

CHEMISTRY _IJSO STAGE-IDPP-3

CHEMISTRY _IJSO STAGE-IDPP-5

Ques 1 2 3 4 5 6 7 8 9 10

Ans D D D B C B B C B B

Ques 1 2 3 4 5 6 7 8 9 10

Ans D B B A C D B C B D

2. (A)-(4), (B)-(1), (C)-(3), (D)-(2)

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Chemistry IJSO Stage-1