Question

(1) Which of the following contains least number of molecules?

(a) 22.4 litre of SO2 gas at STP (b) 0.2 mole of SO2 gas

(c) 32 gram of SO2 gas (d) 11,200 ml of SO2 gas at STP

(2) The amt. of CO2 produced when 1 mole of C is burnt in 16 g of oxygon would be

(a) 22 g (b) 32 g (c) 16 g (d) 44 g

(3) How many protons are present in 10 gm of calcium carbonate?

(a) 3.0115



1024 (b) 1.5057



1024 (c) 2.0478



1024 (d) 4.0956



1024

(4) How many grams of glucose will be required to have solution having 10 % w/w concentration?

(a) 30 gram (b) 60 gram (c) 10 gram (d) 20 gram

(5) How many moles of oxygen required for combustion of 92 g ethanol?

(a) 3 (b) 6 (c) 2 (d) 4

(6) The total number of neutrons present in 540 gram water are...........

(a)

A

240 N

(b)

A

30 N

(c)

A

540 N

(d)

A

18 N

(7) Mention the number of valence electrons in 4.2 gram

N3

−

ion. (NA = Avogadro's number)

(a) 2.1 NA (b) 4.2 NA (C) 1.6 NA (d) 3.2 NA

(8) How many grams of Al will be consumed when Al metal reacts with 1.5 mole oxygen to produce

A12O3?

(a) 81 gm (b) 54 gm (c) 40.5 gm (d) 27 gm

(9) How many grams of Zn will react with dilute

H SO2 4

, as to obtain 224 ml H2 gas at STP? (Zn = 65 g

mol–1

)

(a) 65 gm (b) 0.065 gm (c) 0.65 gm (d) 6.5 gm

(10) 21.6 gm boron element is obtained by the reduction of Boron trichloride with hydrogen at 273 K

temperature and 1 atm. pressure. (Atomic mass = 10.8 g mole–1

), then what will be the volume of H2

gas used during the reaction?

(a) 67.2 litre (b) 44.8 litre (c) 22.4 litre (d) 89.6 litre

(11) 19.7 kg gold is seized from a thief, then how many molecules of gold are seized by him?

(Atomic weight of gold = 197 gram mole–1

)

(a) 6.022



1024 (b) 6.022



1023 (c) 6.022



1025 (d) 6.022



1021

(12) The number of moles and the number of atoms of carbon in 100 gm CO2 are respectively..........

(Molecular mass of CO2 = 44 g mol–1

)

(a) 2.27 and 1.366



1023

(b) 22.7 and 13.669



1023

(c) 2.27 and 13.669



1023

(d) 227 and 1.366



1023

(13) Which of the following has same molecules as that are present in 16 gm of O2?

(I) 32 gm SO2 (II) 22 gm CO2 (III) 7 gm NO (IV) 14 gm N2

(a) III and IV (b) II and III (c) I and IV (d) I and I​

Answer 1

Answer:

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