chemistry

Subject : Chemistry Topic : DPP No. __

IJSO (WORKSHOP)DAILY PRACTICE PROBLEMS

SESSION-2011-12IIT-JEE | AIPMT | AIEEE | OLYMPIADS | KVPY | NTSE

1. If each orbital can take maximum of three electrons, the number of elements in the third period of theperiodic table will be :(A) 12 (B) 5 (C) 8 (D) 24

2. The number of elements which can be accommodated in the present set-up of the long form of theperiodic table is :(A) 120 (B) 118 (C) 122 (D) 124

3. What would be the atomic number of the next halogen if discovered in future ?(A) 115 (B) 119 (C) 117 (D) 121

4. The electronic configurations for some neutral atoms are given below -(1) 1s2, 2s2, 2p6,3s2 (2) 1s2, 2s2, 2p6, 3s1

(3) 1s2, 2s2 2p6, 3s2 3p2 (4) 1s2, 2s2, 2p6, 3s2, 3p3

Which of these is expected to have the highest second ionisation enthalpy ?(A) 1 (B) 2 (C) 3 (D) 4

5. Which of the following is wrong statement ?(A) All the actinide elements are radioactive.(B) Alkali and alkaline earth metals are s-block elements.(C) Chalcogens and halogens are p-block elements.(D) The first member of the lanthanide series is lanthanum.

6. Which of the following is the correct statement ?(A) The second ionisation potential of an atom is always less than the first ionisation potential.(B) The addition of an electron to a neutral atom is an endothermic process.(C) Fluorine has the maximum electronegativity.(D) The size of the cation is always less than the size of the neutral atom.

7. (A), (B) (C) are elements in the third short period. Oxide of (A) is ionic, that of (B) is amphoteric and of (C)a giant molecule. (A), (B) and (C) have atomic number in the order :(A) (A) < (B) < (C) (B) (C) < (B) < (A) (C) (A) < (C) < (B) (D) (B) < (A) < (C)

8. Match the list I with list II and select the correct answerList I List II

(A) Most electronegative element (1) Chlorine(B) The element having highest electron affinity (2) Hydrogen(C) Most abundant element in the universe (3) Nitrogen(D) Most abundant gas in atmosphere (4) Fluorine

A B C D(A) 1 2 3 4(B) 4 3 2 1(C) 4 1 2 3(D) 2 3 4 1

9. The five successive ionisation energies of the element are 800, 2427, 3658, 25024 and 32824 kJ mol�1

respectively. The number of valence electrons is :(A) 3 (B) 5 (C) 4 (D) 2

10. Following statements regarding the periodic trends of chemical reactivity of the alkali metals and thehalogens are given. Which of these statements gives the correct picture ?(A) The reactivity decreases in the alkali metals but increases in halogens with increase in atomicnumber down the group(B) In both the group, the chemical reactivity decreases with increases in atomic number down in thegroup(C) In both the groups, the chemecially reactivity increases with increases atomic number down thegroup(D) In alkali group, the chemical reactivity increases but decreases in the halogens with increases inatomic number down the group.

PERIODIC TABLE 01

id27515437 pdfMachine by Broadgun Software - a great PDF writer! - a great PDF creator! - http://www.pdfmachine.com http://www.broadgun.com




1. The radioactivity of uranium minerals is usually more in comparison to pure uranium. This is due topresence of ------ in the mineral.(A) actinium (B) thorium (C) radium (D) plutonium

2. The ionising power of , and -rays is in the decreasing order :(A) > > (B) > > (C) > > (D) > >

3. If a radioactive substance is placed in vacuum at 100ºC , its rate of distintegration in comparison to one

atmospheric pressure.(A) is not affected (B) increases(C) decreases (D) increases when the product is gas

4. A radioactive sample has a half-life period 1500 years . A sealed tube containing 1 g of the sample willcontain after 3000 year -(A) 1 g of the sample (B) 0.5 g of the sample

(C) 0.25 g of the sample (D) 0.025g of the sample

5. The reaction , 5B8

4Be8 takes place due to

(A) decay (B) decay (C)electron capture (D) positron decay

6. In - decay n/p ratio(A) remains unchanged (B) may increases or decrease(C) increases (D) decreases

7. The ratio of the e/m values of a proton and an - particle is -(A) 2 : 1 (B) 1 : 1 (C) 1 : 2 (D) 1 : 4

8. The first nuclear explosion by India was carried out at -(A) Puskar (B) Narora (C) Pokhran (D) Mumbai

9. A radioactive atom �X� emits a -particle to produce an atom �Y� which then emits an -particle to givean atom �Z� -(a) The atomic number of �X� is less than that of �Z�

(b) The atomic number of �Y� is less than that of �Z�

(c) The mass number of �X� is same as that of �Y�

(A) (a), (b) and (c) are correct (B) (a) and (b) are correct(C) (b) and (c) are correct (D) (c) is correct

10. In radioactive decay UTh 23492

23490 the number of and particles emitted respectively are -

(A) 0, 2 (B) 2, 0 (C) 1, 2 (D) 2, 1

11. The nucleus resulting from 92

U238 after successive emission of two - and four - particles is -(A)

90Th230 (B)

94Pu230 (C)

88Ra230 (D)

92U230

12. Which one of the following is an artificial fuel for nuclear reactors ?

(A) U238 (B) Pu239 (C) U235 (D) Th232

13. Which of the following does not contain material particles ?(A) -rays (B) -rays (C) -rays (D) Anode rays

RADIOACTIVITY 02




1. Three mole of Na2CO

3 is reacted with 6 moles of HCl solution. Find the volume of CO

2 gas produced at

STP. The reaction is -

Na2CO

3 + 2HCl 2NaCl + CO

2 + H

2O

(A) 67.2 L (B) 67.02 L (C) 66 L (D) 65 L

2. The molar composition of polluted air is as follows :

Gas At. Wt. mole percentage composition

Oxygen 16 16%

Nitrogen 14 80%

Carbon dioxide 44 03%

Sulphurdioxide 64 01%

What is the average molecular weight of the given polluted air ? (Given, atomic weights of C and S are

12 and 32 respectively.

(A) 30 (B) 29.48 (C) 27.48 (D) 28.49

3. Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately

67200.Calculate the number of iron atoms (at. wt. of Fe = 56) present in one molecule of haemoglobin.

(A) 3.9 amu (B) 4 amu (C) 3.7 amu (D) 3.6 amu

4. Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallisation. If the law of constant propor

tions is true, calculate the weight of zinc required to produce 20 g of the crystals.

(A) 4g (B) 3.53 g (C) 4.53 g (D) 5.53 g

5. A sample of (C2H

6) ethane has the same mass 107 molecules of methane. How many C

2H

6 molecules

does the sample contain ?

(A) 5.34 × 1011 (B) 5.34 × 108 (C) 5.55 × 108 (D) 5.23 × 1011

6. How many gram of N2 is produced when 170 g NH

3 (M = 17) decomposes ?

(A) 28 g (B) 27 g (C) 140 g (D) 32 g

7. Which of the following sample contains the maximum number of atoms ?

(A) 1 mg of C4H

10(B) 1 mg of N

2(C) 1 mg of Na (D) 1 ml of water

8. 2.76 g of silver carbonate on being strongly heated yields a residue weighing -

(A) 2.16g (B) 2.48 g (C) 2.32 g (D) 2.64 g

9. From 160 g of SO2(g) sample, 1.2046 × 1024 molecules of SO

2 are removed then find out the volume of

left over SO2(g) at STP.

(A) 11.1 lit. (B) 11.2 lit (C) 11.3 lit (D) 11.4 lit

10. 14 g of nitrogen gas and 22 g of CO2 gas are mixed together. Find the volume of gaseous mixture at

STP.

(A) 22.4 lit. (B) 22.2 lit. (C) 30 lit. (D) 20 lit.

MOLE CONCEPT 03




ACIDS AND BASE , METALS AND NON METALS

1. When copper is heated in air

(A) CuO is formed. (B) Cu2O2 is formed. (C) Cu2O is formed. (D) CuO2 is formed.

2. Aqua regia consists of HCl and HNO3 in the ratio:

(A) 3 part HCl + 1 part HNO3 (B) 1 part HCl + 3 part HNO3

(C) 3 part HCl + 1 part HNO2 (D) 3 part HCl + 1 part H2SO4

3. Pair of metals that have very low melting points (less than 30ºC) are

(A) sodium and gallium. (B) potassium and cesium.

(C) gallium and cesium. (D) sodium and potassium.

4. When SO2 is passed through lime water, it turns milky. The milkiness is due to the formation of -

(A) CaSO3

(B) Ca(OH)2

(C) H2O (D) SO

2

5. Which is the correct order of the acidic strength ?

(A) HClO4 > HClO

3 > HClO

2(B) H

3PO

4 > H

3PO

3 > H

3PO

2

(C) HF > HCl > HBr (D) H2S > HF > HCl

6. Which of the following statements incorrect ?

(A) Liquid ammonia is an amphiprotic like water.

(B) In the equation , Ag+ + 2CN� [Ag(CN)2]� , Ag+ ion acts as a Lewis acid.

(C) I� ion is a Lewis as well as Bronsted base.

(D) BF3 is a Lewis as well as Bronsted acid

7. Acids are the substance that yield H+ ions in aqueous solutions while bases yield OH� ions. In a neutral

solution :

(A) There are no H+ ions

(B) There are no OH� ions

(C) There are neither H+ nor OH� ions

(D) H+ and OH� ions are present in very small but equal number

8. In which of the following cases the acidic strength is highest ?

(A) pka = 5 (B) pk

a = 4 (C) pk

a = 6 (D) pk

a = 3

9. Which of the following gases on dissolution in water make the solution acidic ?

(1) CO, (2) CO2

(3) SO3

(4) PH3

(A) (1) and (2) (B) (2) and (3) (C) (3) and (4) (D) (2) and (4)

10. One litre of an acidic solution of pH = 2 is mixed with two litre of other acidic solution of pH = 3. The

resulting pH of the mixture is - (log10

4 = .6020)

(A) 2.39 (B) 4 (C) 7 (D) 9

11. The pH of 10�8 molar HCl solution at 25ºC is nearly (log10

11 = 1.0414)

(A) 10 (B) 7 (C) 8 (D) 14

12. The compound whose aqueous solution has the highest pH is -

(A) NaCl (B) Na2CO

3(C) NH

4Cl (D) NaHCO

3

04




1. The compound soluble in ether is

(A) Sodium chloride. (B) Magnesium chloride. (C) Methyl chloride. (D) Aluminium chloride.

2. Which combination will give the strongest ionic bond ?

(A) Na+ and Cl� (B) Mg2+ and Cl� (C) Na+ and O2� (D) Mg2+ and O2�

3. Which of the following have identical bond order ?

(I) CN� (II) O2� (III) NO+ (IV) CN+

(A) I, III (B) I, II (C) II, IV (D) I, II, III

4. Which of the following species is diamagnetic in nature ?

(A) He2+ (B) H

2(C) H

2+ (D) H

2�

5. The number and type of bonds between two carbon atoms in calcium carbide are :

(A) one sigma, one pi (B) one sigma, two pi

(C) two sigma, one pi (D) two sigma, two pi

6. [In Ag (CN)2]� , the number of -bonds is :

(A) 2 (B) 3 (C) 4 (D) 6

7. Molecular shapes of SF4 CF

4 and XeF

4 are -

(A) the same with 2,0 and 1 lone pair of electrons

(B) the same with 1,1 and 1 lone pair of electrons

(C) different with 0,1 and 2 lone pair of electrons

(D) different with 1,0 and 2 lone pair of electrons

10. Which of the following is correct ?

(A) The number of electrons present in the valence shell in SF6 is 12.

(B) The rates of ionic compounds are very slow.

(C) According to VSEPR, SnCl2 is linear molecule.

(D) The correct order of ability to form ionic compounds among Na+, Mg2+, and Al3+, > Mg2+ > Na+

11. Which has maximum covalent character ?

(A) NaCl (B) SiCl4

(C) AlCl3

(D) MgCl2

12. The compound which contains both ionic and covalent bond is -

(A) CH4

(B) H2

(C) KCN (D) KCI

CHEMICAL BONDING 05

chemistry

Documents