Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee.

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee:

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Q) A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with concentration H_{2}*S*O_{4} The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be: (2018)

a. 1.4

b. 3.0

c. 4.4

d. 2.8

Solution: d. 2.8

Q) In which case is number of molecules of water maximum? (2018)

a. 18 mL of water

b. 0.18 g of water

c. 10 mol of water

d. 0.00224 L of water vapours at 1 atm and 273 K

Solution: a. 18 mL of water

Q) What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO, is mixed with 50 mL of 5.8% NaCl solution? ( Ag = 107.8 , N = 14 O = 16 Na = 23 Cl = 35.5 ) (2015 Re)

a. 3.5 g

b. 7 g

c. 14 g

d. 28 g

Solution: b. 7 g

Q) A hydrocarbon contains 85.7% of Carbon and 14.3% of Hydrogen. If 42 mg of the compound contains 3.01 * 10 ^ 20 molecules, the molecular formula of the compound will be:

(2017-Gujarat)

a. C_{2}*H_{4}

b. C_{3}*H_{6}

c. C_{6}*H_{12}

d. C_{12}*H_{24}

Solution: c. C_{6}*H_{12}

Q) The mole fraction of the solute in one molal aqueous solution is: (2005)

a. 0.054b

b. 0.042

c. 0.018

d. 0.009

Solution: c. 0.018

Q) Suppose the elements X and Y combine to form two compounds X*Y_{2} and X_{3}*Y_{2} When 0.1 mole of X*Y_{2} weighs 10 g and 0.05 mole of X_{3}*Y_{2} weighs 9 g, the atomic weights of X and Y are: (2016-II)

a. 20, 30

b. 30, 20

c. 40, 30

d. 60, 40

Solution: c. 40, 30

Q) The number of water molecules is maximum in: (2015 Re)

a. 18 moles of water

b. 18 molecules of water

c. 1.8 gram of water

d. 18 gram of water

Solution: a. 18 moles of water

Q) If Avogadro number N_{A} is changed from 6.022 * 10 ^ 23 * mo * l ^ – 1 to 6.022 * 10 ^ 20 * mo * l ^ – 1 this would change: (2015 Re)

a. The ratio of elements to each other in a compound

b. The definition of mass in units of grams

c. The mass of one mole of carbon

d. The ratio of chemical species to each other in a balanced equation

Solution: c. The mass of one mole of carbon

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO, is mixed with 50 mL of 5.8% NaCl solution? ( Ag = 107.8 , N = 14 O = 16 Na = 23 Cl = 35.5 ) (2015 Re)

a. 3.5 g

b. 7 g

c. 14 g

d. 28 g

Solution: b. 7 g

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) The weight of silver (atomic weight=108) displaced by a quantity of electricity which displaces 5600 mL of O{2} at STP will be: (2014)

a. 10.8 g

b. 54.0 g

c. 108.0 g

d. 5.4 g

Solution: c. 108.0 g

Q) Camphor is often used in molecular mass determination because: (2004)

a. It has a very high cryoscopic constant

b. It is volatile

c. It is solvent for organic substances

d. It is readily available

Solution: a. It has a very high cryoscopic constant

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) When 22.4 litres of H_{2}(g) is mixed with 11.2 litres of Cl{2}(g) each at STP, the moles of HCI(g) formed is equal to: (2014)

a. 2 mol of HCl(g)

b. 0.5 mol of HCl(g)

c. 1.5 mol of HCl(g)

d. 1 mol of HCl(g)

Solution: d. 1 mol of HCl(g)

Q) 1.0 g of magnesium is burnt with 0.56 g O{2} in a closed vessel. Which reactant is left in excess and how much?

(Atomic weight Mg = 24 O = 16)

(2014)

a. O{2} 0.16 g

b. Mg, 0.44 g

c. O{2} 0.28 g

d. Mg. 0.16 g

Solution: d. Mg. 0.16 g

Q) Equal masses of H{2} ,O{2} and methane have been taken in a container of volume V at temperature 27 degree C in identical conditions. The ratio of the volumes of gases H{2} : O{2} : methane would be: (2014)

a. 8:16:1

b. 16:8:1

c. 16:1:2

d.8:1:2

Solution: c. 16:1:2

Q) 6.02 * 10 ^ 20 molecules of urea are present in 100 mL. of its solution. The concentration of solution is: (2013)

a. 0.02 M

b. 0.01 M

c. 0.001 M

d. 0.1 M

Solution: b. 0.01 M

Q) An excess of AgNO, is added to 100 ml of a 0.01 M solution of dichlorotetraaquachrominum(III) chloride. The number of moles of AgCl precipitated would be:

a. 0.001

b. 0.002

c. 0.003

d. 0.01

Solution: a. 0.001

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 Μ ΗΝΟ,? The concentrated acid is 70% HNO, (2013)

a. 45.0 g conc. HΝΟ,

b. 90.0 g conc. HΝΟ,

c. 70.0 g conc. HNΟ,

d. 54.0 g conc. HΝΟ.

Solution: a. 45.0 g conc. HΝΟ

Q) Which has the maximum number of molecules among the following? (2011 Mains)

a. 8 g H{2}

b. 64 g SO{2}

c. 44 g CO{2}

d. 48 g O{3}

Solution: a. 8 g H{2}

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) The number of atoms in 0.1 mol of a triatomic gas is: (N{A} = 6.02 * 10 ^ 23 mol^ -1): (2010 Pre)

a. 1.8 * 10 ^ 22

b. 6.026 * 10 ^ 22

c. 1.806 * 10 ^ 23

d. 3.6 * 10 ^ 23

Solution: c. 1.806 * 10 ^ 23

Q) 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be: (2009)

a. 3 mol

b. 4 mol

c. 1 mol

d. 2 mol

Solution: b. 4 mol

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C-38.71% and H-9.67%. The empirical formula of the compound would be: (2008)

a. CH{4}O

b. CH{3}O

C. CH{2}O

d. CHO

Solution: b. CH{3}O

Q) What volume of oxygen gas (O{2}) measured at 0 degree C and 1 atm, is needed to burn completely 1 L of propane gas (C{3}H{8}) measured under the same conditions? (2008)

a. 10 L

b. 7 L

c. 6 L

d. 5 L

Solution: d. 5 L

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) How many moles of lead(II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g HCI? (2008)

a. 0.011

b. 0.029

c. 0.044

d. 0.333

Solution: b. 0.029

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) An element X, has the following isotopic composition: 200X: 90% ^ 199 (X / 8)% ^ 202 (X / 2)% The weighed average atomic mass of the naturally occurring element X is closest to: (2007)

a. 201 amu

b. 202 amu

c. 199 amu

d. 200 amu

Solution: d. 200 amu

Q) Volume of CO₂ obtained by the complete decomposition of 9.85 gm BaCO, is: (2000)

a. 2.24 L

b. 1.12 L

c. 0.84 L

d.0.56 L

Solution: b. 1.12 L

Q) Camphor is often used in molecular mass determination because: (2004)

a. It has a very high cryoscopic constant

b. It is volatile

c. It is solvent for organic substances

d. It is readily available

Solution: a. It has a very high cryoscopic constant

Q) The maximum number of molecules is present in: (2004)

a. 5 L of N{2} gas at STP

b. 0.5 g of H{2} gas

c. 10 g of O{2} gas

d. 15 L of H{2} gas at STP

Solution: d. 15 L of H{2} gas at STP

Q) Which has maximum molecules: (2002)

a. 7 g N{2}

b. 2 g H{2}

c. 16 g NO{2}

d. 16 g O{2}

Solution: b. 2 g H{2}

Q) The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then empirical formula is: (2002)

a. C{3}H{13}N{3}

b. CH{2}N

c. CH{4}N

d. CH{6}N

Solution: c. CH{4}N

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee

Q) Find the molarity of liquid HCl if density of liq. HCl is 1.17 g/cc: (2001)

a. 36.5

b. 18.25

с. 32.05

d. 42.10

Solution: с. 32.05

Q) A hydrocarbon contains 85.7% of Carbon and 14.3% of Hydrogen. If 42 mg of the compound contains 3.01 * 10 ^ 20 molecules, the molecular formula of the compound will be:

(2017-Gujarat)

a. C_{2}*H_{4}

b. C_{3}*H_{6}

c. C_{6}*H_{12}

d. C_{12}*H_{24}

Solution: c. C_{6}*H_{12}

Q) Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight = 78.4) then minimum molecular weight of peroxidase anhydrous enzymes is: (2001)

a. 1.568 * 10 ^ 4

b. 1.568 * 10 ^ 3

c. 15.68

d. 2.136 * 10 ^ 4

Solution: a. 1.568 * 10 ^ 4

Q) Specific Volume of cylindrical virus particle is 6.02 * 10 ^ – 2 * cc / g whose radius and length are 7 Å and 10 Å respectively. If N{A} = 6.02 * 10 ^ 23 Find molecular weight of virus: (2001)

a. 15.4 kg/mol

b. 1.54 * 10 ^ 4 * kg / mol

c. 3.08 * 10 ^ 4 * kg / mol

d. 3.08 * 10 ^ 3 * kg / mol

Solution: a. 15.4 kg/mol

Class 11 Chemistry Chapter 1 Important Questions For Neet and Jee/ Class 11 chemistry chapter 1 important previous year questions for neet and jee.

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