CBSE Questions for Class 11 Medical Chemistry Some Basic Concepts Of Chemistry Quiz 2 - MCQExams.com

Uncertainty Principle was given by:
  • Heisenberg
  • Thomson
  • Rutherford
  • Bohr
Who proposed atom as an indestructible entity?
  • Rotherford
  • Dalton
  • Thomson
  • Pauli
Determine the mass by mass percentage concentration of a 100g salt solution which contains 20g salt.
  • 30%
  • 20%
  • 80%
  • none of these
Who performed the gold foil experiment?
  • Thomson
  • Goldstein
  • Chadwick
  • Rutherford

Who is given the credit for creation of first nuclear reactor.
  • Fermi
  • Niels Bohr
  • Einstein
  • Oppenheimer
Which one of the following scientist's proposed the law of conservation of mass?
  • J.J. Thomson
  • John Dalton
  • Rutherford
  • Berzelius
According to Indian and Greek philosophers at 400 B.C. ,the continuous sub-division of matter would ultimately yield _______.
  • atom
  • electron
  • proton
  • neutron
The weight ratio of roasted ore, coke and limestone fed into the blast furnace in the manufacture of cast iron is:
  • $$8:1:4$$
  • $$6:4:1$$
  • $$8:4:1$$
  • $$8:4:3$$
$$4.6\times 10^{22}$$ atoms of an element weight $$13.8$$ g. What is the atomic mass of the element?
  • 290 u
  • 180.6 u
  • 34.4 u
  • 104 u
The isotopes of chlorine with mass numbers $$35$$ and $$37$$ whose average mass is 35.5 exist in the ratio of:
  • $$1:1$$
  • $$3:1$$
  • $$3:4$$
  • $$3:2$$
The main constituent of LPG is butane. Then
(A) Butane can be liquefied easily under high pressure
(B) Butane is liquefied by chemically reacting with ethane and propane.
  • Only A is true
  • Only B is true
  • Both A and B are true
  • Both A and B are false
Number of ions present in $$1$$ ml of $$0.1$$ M barium nitrate solution is:
  • $$1.8\times $$ $$10^{20}$$
  • $$6\times $$ $$10^{19}$$
  • $$1.8\times $$ $$10^{23}$$
  • $$1.8\times $$ $$10^{-20}$$
A solution is prepared by adding $$2$$ g of substance $$A$$ to $$18$$ g of water. The mass percent of the solute is:
  • $$10$$
  • $$20$$
  • $$40$$
  • $$25$$
  • Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • Assertion is correct statement but reason is wrong statement.
  • Assertion is wrong statement but reason is correct statement.
Which of the following gives the maximum number of ions?
  • $$1$$ mole of $$K_{4} [Fe(CN)_{6}]$$
  • $$1$$ mole of $$[Co(NH_{3})_{6} ] Cl_{3}$$
  • $$1$$ mole of $$NaCl$$
  • $$1$$ mole of $$K_{3}[Fe(CN)_{6}]$$
The number of $$Cl^{-}$$ and $$Ca^{2+}$$ ions in $$222$$g of $$CaCl_{2}$$ is:
  • $$4N_A, 2N_A$$
  • $$2N_A, 4N_A$$
  • $$1N_A, 2N_A$$
  • $$2N_A, 1N_A$$
Which of the following is the best example to demonstrate the law of conservation of mass?
  • 12 gm of carbon combines with 32 gm of oxygen to form 44 gm of $$CO_{2}$$.
  • When 72 gm of carbon is heated in a vacuum and no change in its mass takes place.
  • The weight of a piece of platinum is the same before and after heating in air.
  • None of these
In which of the following electrolytes, largest number of ions are present?
  • $$50\:g\:K_{2} SO_{4}\ (mol. wt. = 174)$$
  • $$50\:g\:NaCl\ (mol. wt. = 58.5)$$
  • $$50\:g\:NH_{4}Cl \ (mol. wt. = 53.5)$$
  • $$50\:g\:CaCl_{2\ }(mol. wt. = 111)$$
When 4 L of nitrogen completely reacts with hydrogen, what would be the volume of ammonia gas formed?
  • $$2 L$$
  • $$4 L$$
  • $$5 L$$
  • $$8 L $$
$$10.0\ g$$ of $$CaCO_{3}$$ on heating gave $$4.4\ g$$ of $$CO_{2}$$ and $$5.6\ g$$ of $$CaO$$. This observation is in agreement with the:
  • law of constant composition
  • law of multiple proportion
  • law of reciprocal proportion
  • law of conservation of mass
What will be the ratio of $$Cl^{35}$$ and $$Cl^{37}$$ respectively in ordinary chlorine if the atomic weight of chlorine is 35.5 ?
  • 1:3
  • 3:1
  • 1:2
  • 2:1
18 carat gold contains ?
  • 18 % gold
  • 24 % gold
  • 75 % gold
  • 60 % gold
Active mass of 6% solution of compound X is 2. Molecular weight of X would be :
  • $$6$$
  • $$30$$
  • $$60$$
  • $$90$$
What is the mass percent of carbon in carbon dioxide?
  • $$0.034$$%
  • $$27.27$$%
  • $$3.4$$%
  • $$28.7$$%
Two gases A and B are taken in same volume containers under similar conditions of temperature and pressure. In container A, there are '2N' molecules of gas A. The number molecules does container B have :
  • N
  • 0.5N
  • 2N
  • 4N
Gram molar volume for a gas is always considered at ___ conditions.
  • NTP
  • STP
  • variable temperature
  • none of these
Chemical compounds are formed to have constant composition irrespective of their
  • Method of formation (or) Source
  • Conditions for formation
  • Substances taken for formation
  • Time of formation
If 25% (w/v) of solution has a density of 1.12 g ml$$^{-1}$$, then:
  • weight of the solvent in 100 ml solution is 87 g.
  • weight of the solution per 100 ml is 106 g.
  • weight of the solution per 100 ml is 112 g.
  • weight of the solution in 100 ml of solution is 100 g.
Barium chloride reacts with sodium sulphate to form Barium sulphate and sodium chloride. Then, according to the law of conservation of mass:
  • the total mass of reactants, barium chloride, and sodium sulphate taken is greater than the total mass of products, barium sulphate, sodium chloride formed
  • the total mass of reactants, barium chloride, and sodium sulphate is less than the total mass of products, barium sulphate, and sodium chloride
  • the total mass of the reactants is equal to the total mass of products
  • none of the above
A solution is prepared by dissolving 5.64 g of glucose in 60 g of water. Calculate the mass percent of glucose.
  • 8.59%
  • 6.85%
  • 9.34%
  • 3.59%
The volume occupied by half a mole of a gas at STP is:
  • 5.6 L
  • 11.2 L
  • 22.4 L
  • 44.8 L
What is the mass of one atom of $$C-12$$ in grams?
  • 1.992$$\displaystyle \times 10^{-23}$$ gm
  • 1.989$$\displaystyle \times 10^{-23}$$ gm
  • 1.892$$\displaystyle \times 10^{-23}$$ gm
  • 1.965$$\displaystyle \times 10^{-23}$$ gm
A neutral atom of an element has a nucleus with a nuclear charge 13 times and mass 27 times that of hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?
  • 27 : 13
  • 10 : 19
  • 10 : 13
  • 10 : 14
Bromine atom is available in two isotopes, $$^{79}_{35}Br$$ (49.7%) and $$^{81}_{35}Br$$ $$(50.3\%)$$, the average atomic mass of bromine atom is :
  • $$79.016$$
  • $$80.076$$
  • $$80.006$$
  • $$81.016$$
Boron has two stable isotopes, $$^{10}B (19\%)$$ and  $$^{11}B(81\%)$$. Average atomic weight for boron in the periodic table is:
  • 10.8
  • 10.2
  • 11.2
  • 10.0
Which isotope of carbon is used for getting relative atomic masses?
  • C-12
  • C-13
  • C-14
  • C-15
One a.m.u. or one 'u' is equal to :
  • $$1.66053892 10^{-27} kg$$
  • $$1.66053892 10^{-29} kg$$
  • $$1.23457656 10^{-27} kg$$
  • $$1.23457656 10^{-29} kg$$
The modern atomic mass unit is based on the mass of :
  • C-12 isotope
  • hydrogen
  • oxygen
  • nitrogen
The pair of species having different percentage (by mass) of carbon is :
  • $$CH_{3}COOH$$ and $$C_{6}H_{12}O_{ 6}$$
  • $$CH_{3}COOH$$ and $$C_{2}H_{5}OH$$
  • $$HCOOCH_{3}$$ and $$HCOOH$$
  • $$C_{2}H_{5}OH$$ and $$CH_{3}OCH_{3}$$
If the fertilizers listed below are priced according to their nitrogen content, which will be the least expensive per $$50$$ kg bag?
  • Urea, $$(NH_2)_2CO$$
  • Ammonia, $$NH_3$$
  • Ammonium nitrate, $$NH_4NO_3$$
  • Guanidine, $$HNC(NH_2)_2$$
If an equivalent weight of an element is $$32$$, then the percentage of oxygen in its oxide is : 
  • $$16$$
  • $$40$$
  • $$32$$
  • $$20$$
Which of the following has the largest mass of carbon per gram?
  • $$H_2CO_3$$
  • $$CH_3CO_2H$$
  • $$CH_3OH$$
  • $$CH_3CH_2OH$$
All the substances listed below are fertilizers that contribute nitrogen to the soil. Which of these is the richest source of nitrogen on a mass percentage basis?
  • Urea, $$(NH_2)_2CO$$
  • Ammonium nitrate, $$NH_4NO_3$$
  • Guanidine, $$HNC(NH_2)_2$$
  • Ammonia, $$NH_3$$
Cost of a fertilizer is based on the percentage of nitrogen in it. Which of the fertilizers should be priced maximum?
  • $$ NH_4NO_3 $$
  • $$ NH_2CONH_2 $$
  • $$ KNO_3 $$
  • None of the above
State true or false.
Out of $$CH_3Cl,$$  $$C_6H_6Cl_6$$ and $$CCl_3CHO$$, maximum percentage of chlorine is in $$C_6H_6Cl_6$$.
  • True
  • False
$$Na_2SO_3\cdot xH_2O$$ has $$50\%$$ $$H_2O$$ by mass. Hence, $$x$$ is :
  • $$4$$
  • $$5$$
  • $$6$$
  • $$7$$
Cortisone is a molecular substance containing $$21$$ atoms of carbon per molecule. The mass percentage of carbon in cortisone is $$69.98\%$$. It's molar mass is:
  • $$176.5$$
  • $$252.2$$
  • $$287.6$$
  • $$360.1$$
Which has maximum percentage of $$Cl$$?
  • $$C_6H_6Cl_6$$
  • $$CHCl_3$$
  • $$C_6H_5Cl$$
  • $$CH_3Cl$$
$$1$$ amu is equal to $$1.66\times 10^{-24}$$ g.
  • True
  • False
A certain metal sulphide, $$MS_2$$, is used extensively as a high temperature lubricant. If $$MS_2$$ is $$40.06\%$$ by mass of sulphur, metal $$M$$ has atomic mass :
  • $$160$$ amu
  • $$64$$ amu
  • $$40$$ amu
  • $$96$$ amu
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