CHEMISTRY

DAILY PRACTICE SHEET

Class Xl

Some Basic Concepts of ChemistryINSTRUCTIONS

• D'S cent2its 45 topicwise questions and 5 exam section questions.

• has of wh«h only ore option correct.

• Van the cottect in the OMR Sheet given at the erud of the DRS.

Oate•

• Each question carries 4 markK

• For every incorrect answer deduct 1 mark.

Vlrne : 50 minutes

Marks 200

General Introduction Laws of Chemical Combinations

students X and Y repot t the weight of the same substance

as 40 g and 4.00 g respectively. of the following

statement is correct?

(a) Both are equally accurate

(b) X is more accurate than Y.

(c) Y is more accurate than X.

(d) Both are scientifically.

2. Which set of ågun•s Will be obtained after rounding up the

following up to three significant figures?

34216, 004597, 104107

(a) 343.00461, 10.4(c) 0.460. 1040

3. Match the followtng,

List r

A. Faraday

B. Dyne

C, Joule

t). I Litte

E, i Erg

(a) A.(iv),

(b) A.(ii), B-(i),

(c) A-(i), B-(ii),'

(d) A-(v); B.(iii),

(b) 342. 00460, 10.4

(d) 34.21, 4 597,

00

(iii)(iv)

(v)

List

02390 cal

2.389 x cal

9.6487 104 coulomb

mg

(D)Åv), (E)Åiii)

(D)/ii).

5.

6.

7.

Ihe following data are obtained when dinitrogen and

dioxygen react together to form different compounds :

Mass of dinitrogen Mass of dioxygen

14

14

28 g

28

16 b_

32

32 g

sogWhich law of chemical combination is obeyed by the above

experimental data?

(a) Law of conservation of mass

(b) Law of definite proportions

(c) Law of multiple proportions

(d) Avogadro's tÄiW

Which of the following statement is correct about the reaction

given below?

(b)

(c)

Total mass of iron and oxygen in reactantstotal mass of iron and oxygen in product; therefore it

fcAIows law of conservation of mass.

'10tal mass of reactants z total mass of product; therefore.

jaw of multiple proportions is followe€l

Gount of Fe203 can be increased by taking any one of

the reactants (iron or oxygen) in exce"

4. Mark the rule which is not correctly statcd about the

determination of significant figures.

(a) Zeros preceding to first non-zero digi! are not

significanc

(b) Zeros between two non-zero digits are not significant.

(c) Zeros at the end or right of the number are significant if

they are on the right side of decimal point.

(d) Amount of produced wili decrease, if the amount

of any one of the reactants (iron or oxygen) is taken in

When burnt in air, 14.0 g mixture ofcarbon and sulphur gives

a mixture oi C02 and S02 in the volume ratio of 2 : volume

being measured at the same conditions ef tempetatute and

pressure. Number of moles of carbon in the mixture is

All non-zero digits are significant. . 0.75 0.25

t'

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8. masses 02 and have been taken

a, container of volume V at temperature 27*C in

idcatical condilions. The ratio of the volumes of gases

02 would

9. Which of the foilowing statements indicates that law of

multiple proportion is being followed?

(a) Sample of carbon dioxide taken from any source will

always have carbon and oxygen in the ratio 1 : 2.

(b) Carbon forms W/o oxides namely C02 and CO, where

masses of oxygen which combine with fixed mass of

carbon are in the simple ratio 2:1.

(c) When magnesium burns in oxygen, the amount of

magnesium taken for the reaction is equal to the amount

of magnesium in magnesium oxide formed.

(d) At constant temperature and pressure, 200 mL of

hydrogen will combine with 100 mL of oxygen to

produce 200 mL of water vapour.

Dalton's Atomic Theory

O. Which law directly explains the law of conservation of

mass?

(a) Dalton's law (b) Avogadro's law

(c) Berzillius law (d) Hund's rule

I I. Which of the following postulates of Dalton's atomic theory

explains the law of constant proportion?

Atoms of given element are identical in mass and

chemical properties.

(b) Atoms combine in the ratio of small whole numbers to

form compounds.

(e) The relative number and kind of atoms are constant in a

given compound.

(d) All of these.

Atonuc and Molecular Masses

Tone gram of a metal carbonate gave O,S6 g of its oxide on

healing, theo equivalent weight

(b)

of

40

the metal will

e.

List 1 List

Mass of H2 produced

when 03 mole of zinc

reacts with excess of TIC*

Q

R.

S.

(a)

(b)

(c)

(d)

Mass of a molecule of a

compound with formula

C70H22

Numbet of molecu}es in

35.5 g

Number of molecules in

64 g of S02

2.

3.

4.

3.01 x {023 molecules

6.023 molecules

1.43 g

2 1

1 2

4 34 3

3

3 4

1 2

2

16. The density of a liquid is 1.2 g/mL 'Ihere are 35 drops in

2 ml. The number of molecules in t drop is (moiecular

weight of liquid = 70)

NA (c) A2 NA (d)(35)2

17. If 3.01 x 1020 molecules are removed from 9B tng of HISC)+

then the number of moles ofH2S04 left is

(a) 0.1 x 10-3 (b) 0.5 x 10

(d) 9.95 x 10-2

18. How many valence electrons are present in 0.53 g of NazCOJ?

(a) 40 x 6.023 x 1023 (b) 0.2 6.023 1023

(c) 0.4 x 6023 x 1023 (d) 2 6.023 x ton

19. The total number of electrons present in 18 mi. of water

(density of water is I g mt. -I ) is

(a) 6.02* 1023 (b) 6.02 x

(c) 6-02 x 1024 (d) 6.02

20. A 5 L vessel contains 2.8 g of N2, When heated K.

30% molecules are dissociated into atoms. Identify thecorrect

(a) Total cumber of moles in the container be(b) Total number of molecules in the container will be

0.78 x 1023.

(c) Total number of atoms in the container bc 0.06,

(d) 20(4) AL of the above.

icnai

i Oxygen "O

•(.)eOiS.999

Jasge*t

number of io g - 6023 Xofisotopes GO. FO

15,995 16999 and 2.0478k

Percentag;.• cotopcsnion

ib

.22. metal 27.6% zod of cgygctiOf the. fitsi ogi,de ts MA then

(d) *1302g •a containing C, H and Oare preggc

0.44 g C02 and 0.18 g If molemolecuhtformuJa the

C'H.02

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filled waterWhat rnolarity of

0.85M (b) 0040M (c) 0.0046M (d) 00/9 M

A toetol oxide hat the f0fJi)0jj Z/ n, It be byhydrogen to give and water. 0, g ofoxide requite; O of' for complete reduction,'Ibe weight of the metal(a) 27.9 (c) 79.8

Match the I with List Il and using the code given below the list" :

List

't.5 m solution of(density 1.45 g/mJ.)

Q, 100 ml. of 3 Mmixed with mL ofi M solution

R. 14.6 m solution of Ca

s. .10 is added to

2,

3.

4.

the cortcct amwer

List JlMole fraction of

Mass of the solute360 g

Molarity M

Molarity M

dd. 'fhc of 3 M g

(b) 'the tno)e

(c) 'fhe tnoj;dity Of NC 7,74 is 3-8'/.

(d) above,

experiment requiret 100 of

Lid p/c,rnS, blow concentratc,d acid density

I M) g/otn'

diluted w/'bj water to prepare

(a) g,) ctnS

b/ beacid the

2 L of 'i M NaOJI solution

EXAM SECTION46. Suppose the elements X and Y combine to form two

compounds XYZ and X3Y2. When 0.1 mole of XYZ weighs

10 g and 0.05 mole X3Y2 weighs 9 g, the atomic weight', of

X and Y are

(a) 40, 30 (b) 60,40 (c) 20.30 (d) 30, 20(NEVI' Phase-Il 2016)

47. The number of water molecules is maximum in

(a) J .8 gram of water (b) 18 gram of water

(c) 18 moles of water (d) 18 molecules of water,

(AIPMT20J5)

48. If Avogadro number NA. is changed from

6.022 x 1023 mol" I to 6.022 x 1020 mol -J . thi% would change

(a) the mass of one mole of carbon

(b) the ratio of chemical species to each other in a balanced

equation

(c) the ratio to each other in compound(d) the definition in of grams.

(AfPMT20/5)

What i' the mau of the precipitate formed when SO Of16.9% colution of i' mixed wit}' 50 ml, ofsolution?

(Ago 1078, 14, oz M,

(a) 3.5g (d) 28 g(AJPMT201S)

50. A mixture ofgaseo contains and 02 gazes in the ratio ofI 4 (w/w). What i' the molar ratio of the two vases in themixture?

(a) 16:1

(AfPMT20'5)

OMR SHEET

Use HB pencil only and darken each circle completely.

Mark only ono choice for oach question as indicated.C«reet

Check your score! If your score is

SELFCHECK/EXCELLENT WORK C' -you prepared

GOOD WORK t 9004

questions attempted

No, Of questions

' Marks seoredinpercentaøe L@hÄBOtSATßFACTORY1•

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