IIT FOUNDATION
(IX_Ass- 2)
1) From 0.22g of CO2 2x1021 molecules are removed. The number of CO2 molecules left behind are
(A) 6.022x1021 (B) 12.044x1021 (C) 1.011x1021 (D) 1.501x1021
2) The weight of a piece of copper is 0.635g. The number of copper atoms present in it are
(A) 0.05 N (B) 0.1 N (C) 0.01 N (D) 1 N
3) The volume occupied by 6.022x1020 molecules at STP is
(A) 22.4 lit (B) 2.24 lit (C) 0.224 lit (D) 0.0224 lit
4) The weight of Aluminium which contain same number of atoms that present in 8g of oxygen
(A) 9 g (B) 6.75 g (C) 13.5 g (D) 18 g
5) Total number of molecules present in a mixture of 7g of N2 and 14g of CO are
(A) 6x1023 (B) 4.5x1023 (C) 3x1023 (D) 1.5x1023
6) 4.4g of CO2 and 2.24 litres of H2 at STP are mixed in a container. The total number of molecules present in the container will be
(A) 6.022x1023 (B) 1.2044x1023 (C) 2 moles (D) 6.023x1024
7) The number of molecules present in 16g of methane is
(A) 3.0x1023 (B) 6.02x1023 (C) x1023 (D) x1023
8) The weight of 11.2 litre of any gas at STP represents its
(A) Gram molecular weight (B) Gram equivalent weight
(C)Gram atomic weight (D) Vapour density
9) 1 mole of CO2 contains
(A) 3g atoms of CO2 (B) 18.1x1023 molecules of CO
(C) 6.02x1023 atoms of oxygen (D) 6.02x1023 atoms of carbon
10) How many atoms are present in one mole of sucrose
(A) 45x6.02x1023 atoms/mol (B) 20x6.02x1023 atoms/mol
(C) 5x6.02x1023 atoms/mol (D) None
11) How many atoms are present in a mole of acetic acid
(A) 8x6.02x1023 atoms/mol (B) 4x6.02x1023 atoms/mol
(C) 6x6.02x1023 atoms/mol (D) None
12) The number of moles of water present in 90g of water is
(A) 2 (B) 3 (C) 4 (D) 5
13) Weight of a single molecule of water is
(A) 3.0x10-23 g (B) 6.02x1023 g (C) 6.02x10-23 g (D) None
14) The number of atoms present in a mole of Ca(OH)2
(A) 30x6.02x1023 atoms/mol (B) 5x6.02x1023 atoms/mol
(C) 3x6.02x1023 atoms/mol (D) None



15) How many atoms are present in a mole of CH3COOC2H5 ?
(A) 14x6.02x1023 atoms/mol (B) 10x6.02x1023 atoms/mol
(C) 7x6.02x1023 atoms/mol (D) None
16) How many grams of magnesium is present in one mole of MgSO4 ?
(A) 120.4 (B) 130.2 (C) 12.04 (D) 360
17) 5.6 litre of oxygen at NTP is equivalent to
(A) 1 mole (B) ½ mole (C) ¼ mole (D) 1/8 mole
18) 1 mole of a compound contains 1 mole of C and 2 moles of O. The molecular weight of the compound is
(A) 3 (B) 12 (C) 32 (D) 44
19) The number of atoms present in 16g of oxygen gas is
(A) 6.02x1011.5 (B) 3.01x1023 (C) 3.01x1011.5 (D) 6.02x1023
20) 8g of O2 has the same number of molecules as
(A) 7g of CO (B) 11g of CO2 (C) 7g of N2 (D) All
21) Which of the following contains the least number of molecules ?
(A) 4.4g of CO2 (B) 1.4 g of N2 (C) 2g of H2 (D) 1g of O2
22) A gaseous mixture contains (in grams) CO2 and O2 in the ratio 11:8. Therefore the ratio of the number of moles of CO2 and O2
(A) 1:2 (B) 1:1 (C) 2:1 (D) 11:8
23) The mass in grams of individual atom of nitrogen is equal to
(A) 28/6.023x1023 (B) 14/6.023x1023 (C) 14 (D) 28
24) If a sample of MgBr2 contains 4x1020 Br- ions, the number fo Mg2+ ions present in it is
(A) 4x1020 (B) 8x1020 (C) 2x1020 (D) 1x1020
25) The molecular mass of Na is 23.0g. Therefore the weight of 1000 atoms of sodium is
(A)23.0x1000 (B) (C) (D)
26) What weight of iron must be weighed out to have a sample that contain 0.25x1023 atoms ?
(A) 0.25g (B) 0.25x1023g
(C) x 55.85g (D) 0.25x1023 x atomic weight of iron
27) At STP the density of a gas (mol.wt=45) in g/lit
(A) 2 (B) 22.4 (C) 11.2 (D) 1000
28) The weight ratio of O2 and N2 gaseous mixture is 1:4. The ratio of molecules in that mixture is
(A) 1:4 (B) 7:32 (C) 3:6 (D) 3:32
29) Which contain least number of molecules ?
(A) 4g of O3 (B) 3g of PH3 (C) 10g of COCl2 (D) 4g of N2O
30) If the weight of 5.6 litre fo gas at NTP is 11.0g. the gas may be
(A) Phosphine (B) Phosgene (C) Nitric oxide (D) Nitrous oxide
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