Chemistry Book FSC CH 1 CLASS 11 Class 12 HSSC Chemistry INTRODUCTION.
Many elements have fractional atomic masses. This is because:
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If we are given the mass of a substance ,we can calculate the _________ of the other substance with the help of a balanced chemical equation:
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The amount of reactant according to the balanced chemical equation is called as?
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Greater the number of moles, _________ will be the number of molecules.
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In which of the following will water evaporate earlier?
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Correct representation of elements with atomic number and atomic mass is?
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How many molecules are there in 2.1 moles of CO2:
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The empirical formula of the compound was found to be 𝐶𝐻2𝑂. If the molar mass of the compound is 150𝑔/𝑚𝑜𝑙. The molecular formula of the compound is:
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Identify the value of R at STP:
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Mass of an atom ranges from?
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Avogadro’s constant is the number of:
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Which of the following have the same number of molecules?
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What is the mass of 2 dm3 of oxygen at S.T.P?
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A compound has an empirical formula CH2Cl and molecular formula mass as 99gmol-1, identify the compound:
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2 moles of octane (C8H18) burn with 25 moles of oxygen (O2) and produced ___________ moles of carbon dioxide along with 18 moles of water.
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A compound has an empirical (simple) formula, C2H2O. If the experimental molecular weight is found to be in the range 160–170, the molecular formula of this compound is:
(Atomic weight: C = 12.1, H = 1.008, O = 16).
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A compound of sodium oxide has 74.2% of sodium and 25.8% of Oxygen. The empirical formula of the compound is?
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The mass of one mole of electron is:
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The mass of 𝑁𝑎𝑂𝐻 needed to prepare 0.2 molal solution in 500𝑔 pure water at 4℃ is:
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Which of the following contains 1 mole of the stated particles?
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The amount of reactant according to the balanced chemical equation is called as?
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If 9.8g of sulfuric acid is dissolved in excess quantity of water, it will yield ____ moles of hydrogen ion (H+) and _____ moles of sulphate ions (SO42-):
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Which of the following will react with water?
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The atomic mass, molecular mass, ionic mass or formula mass of a substance expressed in grams is called:
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X-ray work in 20th century shows that diameter of the atoms are of the order:
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The number of atoms present in a molecule determines its:
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If 9.8g of sulfuric acid is dissolved in excess quantity of water, it will yield _______ moles of hydrogen ion (H+) and _________ moles of sulphate ions (SO42-).
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Which of the following has six isotopes?
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Indicate the incorrect statement from the following:
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The volume of 𝐶𝑂2 produced by heating 33.5𝑔 𝐿𝑖2𝐶𝑂3 at room temperature and pressure is (𝑀𝑟 𝐿𝑖2𝐶𝑂3 = 67𝑔/𝑚𝑜𝑙):
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Number of neutrons in 6630Zn is:
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During combustion analysis, which one is used for absorbing carbon dioxide?
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The total number of neutrons in 5g of H2O are:
1 NA = 6.023 x 10^23
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Calculate the grams of H2O formed when 8g of CH4 burns in excess of oxygen:
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Which of the following has six isotopes?
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Different kinds of atoms of the same element are called isotopes having different __________ but same ___________ properties.
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Determine the number of moles of O in 10.6g of Na2CO3:
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A sample of 0.7 moles of metal ‘M’ reacts completely with an excess of fluorine to form 45 g of MF2. How many moles of F are present in it?
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Formula mass is considered for ___________ compounds instead of their molecular mass:
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What is the mass in grams of 1.69 moles of phosphoric acid?
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Natural gas in homes burns in excess of oxygen, what is the limiting reactant in this case?
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27g of Al will react with how much mass of O2 to produce Al2O3?
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Which of the following have the same number of molecules?
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A sample of 0.7 moles of metal ‘M’ reacts completely with an excess of fluorine to form 45g of MF2. How many moles of F are present in it?
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The unit used to express the relative atomic mass is called?
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The atoms of hemoglobin is heavier than H-atoms:
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Which of the following statement about Avogadro’s hypothesis is correct?
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Number of neutrons in 6630Zn is:
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Which one is monoisotopic element?
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_______ is a macromolecule found in blood.
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Isotopes are?
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Limiting reactant controls the amount of ___________ ?
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Avogadro’s hypothesis is applicable to _______ only.
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Isotopes are the atoms of same element having different number of _________:
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The volume occupied by 4.4g of CO2 at STP is?
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11.207 dm3 of methane at STP has ________ moles of hydrogen atoms:
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The volume of 𝐶𝑂2 produced by heating 33.5𝑔 𝐿𝑖2𝐶𝑂3 at room temperature and pressure is (𝑀𝑟 𝐿𝑖2𝐶𝑂3 = 67𝑔/𝑚𝑜𝑙):
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Atoms having same mass number but different atomic numbers are called?
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Which one is not true about isotopes:
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Molecular ions are formed by passing:
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The number of neutrons in H2SO4 are ________:
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The number of moles of CO2 that contain 8g of oxygen is:
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Limiting reactant controls the amount of ___________ ?
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Actual yield is always less than theoretical yield due to:
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The percentage of nitrogen in ammonium nitrate is:
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The relative abundance of isotopes of elements are measured by?
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Which of the following is not true for a mole?
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Many elements have fractional atomic masses. This is because:
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The mass number of an atom is:
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The number of moles of CO2 that contain 8g of oxygen is:
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Which one is the molar volume of the gas at STP?
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11.2L of CO2 at STP corresponds to how many number of moles?
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Chemical equations do not tell about the ________ because of certain limitations:
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Glucose(C6H12O6) is the most important nutrient in a cell for generating chemical potential energy, what is the mass percent of carbon in 1.5g of sample?
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The number of moles of CO2 which contains 16g of oxygen:
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Mass of one mole of chlorine gas is?
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The bond formed when two or more atoms complete their electron shells by sharing electrons is called __________:
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The relative atomic mass of oxygen is 16 amu. What is the mass of 2 moles of oxygen gas?
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In stoichiometry, we follow law of ________ while doing calculations:
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What is the mass in grams of 1.69 moles of phosphoric acid?
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The break down of molecular ions from natural products give important information about?
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A compound of sodium oxide has 74.2% of sodium and 25.8% of Oxygen. The empirical formula of the compound is?
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The amount of product according to the balanced chemical equation is called as?
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Different kinds of atoms of the same element are called isotopes having different __________ but same ___________ properties.
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30 grams of 2-propanol were mixed with excess acidified K2Cr2O7 and boiled under reflux for 20 minutes. The organic product was then collected by distillation. The yield of product was 75.0%. What is the mass of product produced?
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Isotopes are?
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Identify the value of R at STP:
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The efficiency of a chemical reactions can be checked by calculating ________ yield.
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Find the mass in grams of 1.69 mol of phosphoric acid:
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The _____ study of composition of pure substance in 17th century clearly shows that few elements are components of many substances
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The actual yield is always less than the theoretical yield due to:
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What mass of NaOH is present in 0.5 mol of sodium hydroxide?
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Spectrometry is used when reactants and products absorb _____.
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Avogadro’s constant is the number of:
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The equivalent weight of iron in Fe2O3 would be:
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If the number of molecules of different gases are the same at S.T.P., the occupied volume will be __________:
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A mole of a substance contains _____ particles.
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The smallest number of molecules are present in?
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In the gaseous state, the distance between the molecules is ___________ than their diameters:
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What is the mass of 2 dm3 of oxygen at S.T.P?
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Molecular ions are produced by passing a high-energy electron beam or an x-ray beam through:
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Choose the correct option regarding number of particles associated with one mole of a substance:
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The negative ions having group of atoms is/are:
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The calculation of the efficiency of a chemical reaction can be checked by knowing the amount of:
The relative abundance of isotopes of elements are measured by?
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Choose the correct option regarding number or particles associated with one mole of a substance:
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An atom is composed of electrons, protons, neutrons and _________:
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It is the fact that 22.414 cm3 of any gas has a different mass but the same number of:
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30 grams of 2-propanol were mixed with excess acidified K2Cr2O7 and boiled under reflux for 20 minutes. The organic product was then collected by distillation. The yield of product was 75.0%. What is the mass of product produced?
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Atomicity is determined by number _________ of present in a molecule:
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The total number of neutrons in 5g of H2O are:
1 NA = 6.023 x 1023
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Correct representation of element with atomic number and atomic mass is:
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Which one is the molar volume of a gas at STP?
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In mass spectrometer, detector or collector measures the:
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