Q1 The label on a stock bottle of an acid reads: 56% by
mass and 1.25 specific gravity. If the molar mass of the acid is 56,
the volume of this acid that is required to prepare $$250cm^{3}$$ of 1.0
molar concentration of the acid is .
Q2 If actual yield of an ester is 32.7g and theoretical yield is 35.1g .The percentage yield of the ester will be .
Q3 The number of gram-equivalent weight of solute in one cubic decimeter of solution is _.
Q4 Calculate the formular mass of potassium carbonate.(Relative atomic masses : K=39.10amu, C=12.01amu, 16.00amu).
Q5 $$6.02Χ10^{23}$$ is called _.
Q6 Calculate the percentage by mass of Oxygen in $$CH_{3}OH$$ _.
Q7 The amount of energy required to break a particular bond is called _.
Q8 In a chemical reaction, the balanced chemical equation which shows
the quantitative relationship between masses of reactants and products
is known as _.
Q9 The amount of product expected from given amounts of starting materials is called _.
Q10 The amount of product obtained from an experiment is called _.
Q11 Calculate the percentage by mass of Hydrogen in $$NH_{3}$$ _.
Q12 In a solution, the component in smaller amount is called _.
Q13 In balancing this equation $$Na_{2}CO_{3}$$ —› ? NaOH + CaCO_{3}$$ . ? is _.
Q14 The formula for caustic soda is _.
Q15 Mixtures with particle sizes greater than 1000 nanometres are called _.
Q16 The label on a stock bottle of acid reads : 56% by mass and 1.25
specific gravity. If the molar mass of the acid is 56, what is the the
concentration in grams per dm_{3} _.
Q17 Mixtures with particle sizes between 2 to 1000 nanometre are called _.
Q18 Convert 500g of $$ Na_{2}CO_{3}$$ to moles _.
Q19 When propane reacts with oxygen, the products are and _.
Q20 The molar mass of $$Na_{2}CO_{3}$$
Q21 Convert 2 moles of NaOH to grams of NaOH. Answer is _.
Q22 Dissolution 0f sodium chloride in water results in type of mixture.
Q23 A mixture in which the components are evenly distributed and the
composition is uniform throughout the mixture is called mixture.
Q24 When two or more elements combine chemically in fixed proportion by mass, is formed.
Q25 Calculate the $$[H^{+}] $$of an aqueous solution wity $$[OH^{-}]
of 1× 10^{-10}M$$. What is the pH of the solution? Is the solution
acidic or basic?
Q26 An acid HA has a pka of 4.5. What is the concentration of $$H_{3}^{+} $$ in 0.110M solution of the acid ?
Q27 An acid HA has a pka of 4.5, what is the Ka value?
Q28 Calculate the $$[OH^{-}]$$ of an aqueous solution of Ph=11
Q29 The number of protons or electrons in the atom of an element is equal to the of the element.
Q30 The actual yield of product (in g or moles) expressed as a
percentage of the theoretical yield (in g or moles ) is called _.
Q31 A high percentage yield implies that _.
Q32 The reagent that will not make any significant contribution to the theoretical yield is _.
Q33 A separation technique that is used to isolate a desired solid
from a solid -liquid mixture or for freeing a desired liquid of solid
impurities is called _.
Q34 The process by which traces of water is removed by treating the liquid with suitable drying agents is called _.
Q35 An apparatus that can be used to remove traces of water from a substance is _.
Q36 The condensate collected during the vaporization of liquid is called
Q37 The separation technique employed to separate mixtures of two or
more liquids with slightly different boiling points is called _.
Q38 The technique employed for the separation of colours is called _.
Q39 The technique of separation employed to purify an organic solid that may be contaminated by impurities is called _.
Q40 The base unit of a measured liquid called volume is _.
Q41 An undergraduate weighed out 20grams of sodium hydroxide pellets.
If Na =23, O = 16 andH = 1, What is the mole of this sodium hydroxide.
Q42 is the quantitative isolation of a substance by precipitation and weighing of the precipitate.
Q43 Gravimetric analysis can be generalized into types.
Q44 The weakly bound water in efflorescent compound is known as _.
Q45 Pure substances combine with water in a fixed mole ratio to yield compounds called _.
Q46 is the amount of heat released per amount of fuel.
Q47 represent a large portion of the world energy supply.
Q48 substances are hydrates that lose water when simply exposed to the atmosphere.
Q49 substances readily absorb moisture from the air and are used as drying agents.
Q50 The complex ion formed above is in colour.
Q51 The complex ion formed by Aluminium and hydroxyl ion is known as
Q52 The atoms in a compound are held together by __.
Q53 is the simplest way to express information about the atoms that constitute any given chemical compound.
Q54 Reactions i which substances undergo changes in oxidation number are referred to as _.
Q55 is the drying agent used only at temperatures below 30 °C
Q56 is the most effective drying agent.
Q57 If an acid is splashed on your skin, wash at once with __.
Q58 Distillation is used to remove from a solution.
Q59 Ionic compounds that crystallize from solutions containing sulfate
ion, a trivalent cation and a monovalent cation are known as .
Q60 The complex ion formed by Aluminium and hydroxyl ion is known as .
Q61 What is the oxidation state of iodine in iodate ion?
Q62 When diluting acids, always pour _________.
Q63 ______________________must not be carried through a group of students.
Q64 Students with open skin wounds on hands must ___________.
Q65 If any equipment is not working properly, you must ___________.
Q66 Each laboratory activity should be Prepared by reading _____________.
Q67 __________ is used whenever a reaction mixture has to be kept boiling for an appreciable time and the solvent is volatile
Q68 The stoichiometric ratio is_________.
Q69 A__________ is the reagent that is completely consumed during a chemical reaction.
Q70 The percentage of nitrogen in atomsphere is ____________.
Q71 To determine the percent composition, the amounts of each gas can be measured both by ___________.
Q72 A student measuring a gas should be careful of these except ________.
Q73 The total mass of each element in a compound depends on the number of___________.
Q74 _____________helps identify each constituent
element by its chemical symbol and indicates the number of atoms of each
element in the compound.
Q75 ___________ is a homogeneous mixture of gases
such as nitrogen, oxygen, argon, and trace amounts of other elemental
gases and carbon dioxide.
Q76 The atoms in a compound are held together by _____________.
Q77 ___________ is the simplest way to express information about the atoms that constitute any given chemical compound.
Q78 ____________ may be used to remove any brown stains left on the glassware.
Q79 An algebraic decrease in oxidation number or a process in which electrons are gained________.
Q80 An algebraic increase in oxidation number, or a process in which electrons are lost _________.
Q81 Reactions in which substances undergo changes in oxidation number are referred to as__________.
Q82 ___________________ is the drying agent used only at temperatures below 30 °C.
Q83 _____________ is the most effective drying agent.
Q84 A vacuum desiccator is used to __________.
Q85 In setting up of apparatus,which of these is not a way of loosening seized joints.
Q86 If a solid to be weighed has big crystals or lumps, we are to _________.
Q87 ______________ is the amount of heat released per amount of fuel .
Q88 ___________substances are hydrates that lose water when simply exposed to the atmosphere.
Q89 ________________ substances readily absorb moisture from the air and are used as drying agents.
Q90 _________ substances absorb water from the air until they form a solution.
Q91 ___________ is an alkaline substance, and reacts with conc. HCl to form Boric acid.
Q92 The product formed between a cation and some multidentate ligand to form a ring structure is called a _____________.
Q93 _______________are formed by reactions between cations and anions.
Q94 ______________ precipitating agent is used to precipitate sulphate ion.
Q95 ___________ precipitating agent is used to precipitate halide ions such as chloride.
Q96 The empirical formula does not indicate the exact number of__________ in a single molecule.
Q97 There are __________ types of hardness of water.
Q98 ___________ is the indicator that enables the detection of when the EDTA has completely chelated the metal impurities.
Q99 ____________ is a substance whose molecules can form several bonds to a single metal ion.
Q100 _________ ions make the most significant contribution to water hardness.
Q101 __________ is the substance to be analysed.
Q102 Gravimetric analysis by definition is based upon the measurement of_________.
Q103 _________ are crystalline salts that are bonded to water molecules in definite proportions.
Q104 _____________ is used for the removal of coloured impurities from crude materials.
Q105 The energy rating of a fossil fuel gives us information about its ___________________.
Q106 A very important property of a fuel is its_______.
Q107 ____________ is a light black residue consisting
of carbon, and any remaining ash, obtained by removing water and other
volatile constituents from animal and vegetation
Q108 ______________ is the loss of water (or a
solvent) of crystallization from a hydrated or solvated salt to the
atmosphere on exposure to air.
Q109 ___________________ the process in which a soluble substance picks up water vapor from the air to form a solution.
Q110 ________is the ability of a substance to attract and hold water molecules from the surrounding environment.
Q111 Borax is treated with conc. HCl because it is __________ in nature.
Q112 The major requirements for a good gravimetric analysis are these except _____________.
Q113 Organic precipitating reagents contain functional groups that combine with inorganic ions to form____________.
Q114 Potassium, ammonium, rubidium, and cesium ions can be precipitated by ________.
Q115 Precipitation is effected by_____________ types precipitating agents.
Q116 _________ analysis is concerned with the determination of a substance by the process of weighing.
Q117 Hard water contains one of these metal ions.
Q118 Temporary hardness of water is removed by _____________.
Q119 To establish the exact amounts of various metal ions in a sample of hard water, a ______________ is required.
Q120 Potassium aluminum sulphate dodecahydrate is also called___________.