0.56 g of gas occupies 280cm3 at NTP. Then its molecular mass is:
A. 4.8 B. 44.8 C. 11.2 D. 22.4 Solution: (B) At NTP, 280 cc or 0.28 L weigh 0.56 g... View Article
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Number of atoms in 560 g Fe (atomic mass 56 g mol-1) is:
A. Twice that of 70 g N B. Half that of 20 g H C. Both A and B D.... View Article
Total number of atoms in 44g of CO2 is;
A. 6.02 × 1023 B. 6.02 × 1024 C. 1.806 × 1024 D. 18.06 × 1022 Solution: (A) Molecular mass... View Article
How many moles of Al2(SO4)3 would be in 50g of the substance?
A. 0.0843 mol B. 0.952 mol C. 0.481 mol D. 0.140 mol Solution: (D) Number of moles = Mass /... View Article
A signature written with carbon pencil weighs 1 mg. What is the number of carbon atoms present in the signature?
A. 6.02 × 1020 B. 0.502 × 1020 C. 5.02 × 1023 D. 5.02 × 1020 Solution: (B) 1 mg... View Article
The mass of one mole of electron is;
A. 9.1 × 10−28 g B. 0.55 mg C. 9.1 × 10−24 g D. 6 × 10−12 g Solution: (B)... View Article
Calculate the total number of protons in 10g of calcium carbonate is (N0 = 6.023 × 1023):
A. 3.01×1024 B. 4.06×1024 C. 2.01×1024 D. 3.02×1024 Solution: (A) 1 mole of CaCO3 = 20 × 1 + 6... View Article
How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
A. 0.02 B. 3.125 x 10-2 C. 1.25 x 10-2 D. 2.5 x 10-2 Solution: (B) In one molecule of... View Article
The value of amu is which of the following?
A. 1.57 × 10−24 kg B. 1.66 × 10−24 kg C. 1.99 × 10−23 kg D. 1.66 × 10−27 kg... View Article
In the following questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below:
Assertion: Equal moles of different substances contain the same number of constituent particles. Reason: Equal weights of different substances contain... View Article
Law of constant composition is same as the law of:
A. Conservation of mass B. Conversation of energy C. Multiple proportion D. Definite proportion Solution: (D) Law of definite proportions... View Article
Gram molecular volume of oxygen at STP is;
A. 3200 cm3 B. 5600 cm3 C. 22400 cm3 D. 11200 cm3 Solution: (C) Gram Molecular volume is the volume... View Article
Which one of the following has maximum number of oxygen atoms?
A. 2 g of water B. 2 g of sulphur dioxide C. 2 g of carbon dioxide D. 2 g... View Article
The number of gram molecules of chlorine in 6.02×1025 hydrogen chloride molecules is;
A. 5 B. 50 C. 100 D. 10 Solution: (C) 1 Mole of HCl = 1 + 35.5 = 36.5... View Article
Number of atoms of He in 100u of He (atomic wt of He is 4) are;
A. 25 B. 100 C. 50 D. 100 × 6 × 10−23 Solution: (A) No.ofatoms= Mass of substance / Atomic... View Article
0.1 mole of a carbohydrate with empirical formula CH2O contains 1g of hydrogen. What is its molecular formula?
A. C5H10O5 B. C6H12O6 C. C4H8O4 D. C3H6O3 Solution: (A) Let molecular formula be (CH2O)n In one mole of carbohydrate,... View Article
80g of oxygen contains as many atoms as in;
A. 80g of hydrogen B. 1g of hydrogen C. 10g of hydrogen D. 5g of hydrogen Solution: (D) Oxygen atom... View Article
Mass of 0.1mole of methane is;
A. 1g B. 16g C. 1.6g D. 0.1g Solution: (C) Mass of one mole of methane (CH4) = 16g Mass... View Article
The number of formula units of calcium fluoride, CaF2 present in 146.4g of CaF2 (the molar mass of CaF2 is 78.08g/mol) is.
A. 1.129 × 1024CaF2 B. 1.146 × 1024CaF2 C. 7.808 × 1024CaF2 D. 1.877 × 1024CaF2 Solution: (A) CaF2 =... View Article
What will 1 mole of CO2 contain?
A. 6.023 x 1023 atoms of C B. 6.023 x 1023 atoms of O C. 18.1 x 1023 molecules of... View Article
