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Free MCQs & Online Quiz Practice for Exams

Q: If water samples are taken from sea, river, clouds, lakes or snow, they will be found to contain hydrogen and oxygen in the ratio of 1:8 by weight. This indicates the law of: (Entry test 2006)

A) Definite proportion

B) Multiple proportions

C) Reciprocal proportion

D) None of these

Answer: A. Definite proportion

Q: Which one of the following contains the greatest number of atoms? (Entry test 2008)

A) 4g of hydrogen

B) 4g of magnesium

C) 71g of chlorine

D) 127g of iodine

Answer: A. 4g of hydrogen

Q: How many moles of NaCl are produced from the reaction of 6.022×10²³? (Entry test 2008)

A) 6.022×10²³ mol

B) 0.5 mol

C) 3.011×10²³ mol

D) 1 mole

Answer: D. 1 mole

Q: If 28.0g of nitrogen gas reacts with 8.0g of hydrogen gas to form ammonia, the limiting reactant among the two will be: (Entry test 2008)

A) N₂

B) H₂

C) Both a & b

D) None

Answer: A. N₂

Q: 10L of Cl₂ gas reacts with 40L of H₂ gas under the same conditions of temperature and pressure. How much volume of HCl should be produced? (Entry test 2008)

A) 40L

B) 30L

C) 20L

D) 10L

Answer: C. 20L

Q: A gas at STP contains only 6.02×10²³ atoms and is mono-atomic It will occupy: (Entry test 2010)

A) 1.2 L

B) 22.4 L

C) 30.5 L

D) 44.8 L

Answer: B. 22.4 L

Q: The combustion of one mole of propane (C₃H₈) produces how many moles of water? (Entry test 2011)

A) 2

B) 3

C) 4

D) 5

Answer: C. 4

Q: How many grams of water are produced in burning 2.24 dm³ of hydrogen at STP? (Entry test 2011)

A) 180 g

B) 81g

C) 1.8g

D) 0.18g

Answer: C. 1.8g

Q: How many hydrogen atoms are present in one mole of water? (Entry test 2012)

A) 1.086×10²⁴

B) 1.204×10²⁴

C) 3.01×10²³

D) 6.02×10²³

Answer: B. 1.204×10²⁴

Q: The volume occupied by 3.2 g of oxygen at STP is: (Entry test 2012)

A) 22.4 dm³

B) 2.24 dm³

C) 11.2 dm³

D) 16.0 dm³

Answer: B. 2.24 dm³

Q: How many atoms are contained in one mole of Ca(OH)₂? (Entry test 2012)

A) 5×6.02×10²³

B) 30×6.02×10²³

C) 3×6.02×10²³

D) 6×6.02×10²³

Answer: A. 5×6.02×10²³

Q: One mole is the amount of substance which contains as many elementary entities as contained in: (Entry test 2012)

A) 0.12 kg of ₆C¹²

B) 1.2 kg of ₆C¹²

C) 0.012 kg of ₆C¹²

D) 0.12 kg of ₈O¹⁶

Answer: C. 0.012 kg of ₆C¹²

Q: 1 amu is equal to 1.661×10⁻²⁴ g, then 1.0 g will be equal to: (Entry test 2012)

A) 6.02×10²³ amu

B) 6.02×10⁻²³ amu

C) 6.02×10⁻²⁴ amu

D) 6.02×10²⁴ amu

Answer: A. 6.02×10²³ amu

Q: Which gas occupies the largest volume at STP? (Entry test 2013)

A) 16g of CH₄

B) 32g of O₂

C) 4g of H₂

D) 28g of N₂

Answer: C. 4g of H₂

Q: A sample of carbon-12 has a mass of 3.0 g. Which expression gives the number of atoms in the sample? (Nₐ = Avogadro’s constant) (Entry test 2013)

A) 0.0030Nₐ

B) 0.25Nₐ

C) 3.0Nₐ

D) 4.0Nₐ

Answer: B. 0.25Nₐ

Q: How many molecules are present in 0.20 g of hydrogen gas? (Entry test 2013)

A) (0.20×1.008)×6.02x10²³

B) 0.20×2.016

C) (0.20×2.016)x6.02×10²³

D) (0.20×0.70)x6.02×10²³

Answer: C. (0.20×2.016)x6.02×10²³

Q: Choose the correct relation about the percent yield. It is equal to: (Entry test 2014)

A) (actual yield/theoretical yield)×100

B) (theoretical yield/actual yield)×100

C) (actual yield/theoretical yield)×10⁶

D) (actual yield/theoretical yield)×10³

Answer: A. (actual yield/theoretical yield)×100

Q: Which of the following contains maximum number of atoms? (Entry test 2015)

A) 6 mol of sulfur (S)

B) 2 mol of S₈

C) 5 mol of SO₂

D) 44.8 dm³ of CO₂ at STP

Answer: B. 2 mol of S₈

Q: The number of atoms in 18 g of H₂O are equal to: (Entry test 2015)

A) 6.02×10²³

B) 6.02×10²⁴

C) 1.806×10²⁴

D) 3.052×10²³

Answer: C. 1.806×10²⁴

Q: Theoretical yield is always: (Entry test 2015)

A) Less than practical yield

B) Greater than actual yield

C) Both are equal

D) None of the above

Answer: B. Greater than actual yield