pakmcqs chemistry

PakMCQs Chemistry for Sailors Jobs

If you want to prepare tests for the initial tests of PN Cadet, SSC of Pak Navy, Operational Branch, Mechanical Branch, Weapon Engineering branch, Ordnance Branch, Education Branch, Special Branch, Merchant Navy, General Sailors, Marine Sailors, Technical Sailors or Navy Civilian Jobs then learn Pakmcqs Chemistry for Pak Navy tests and see below,

  •                   is NOT a state of matter.  (Energy)
  • The atomic number of carbon is            .  (6)
  •                elements is a noble gas.  (Helium)
  • The chemical symbol for gold is                .  (Au)
  • The formula for water is              . (H2O)
  •                   is an example of a chemical change.  (Burning wood)
  • The pH of a neutral solution is            . (7)
  •              is a greenhouse gas.  (Carbon dioxide)
  • The chemical formula for table salt is             .  (NaCl)
  •               subatomic particle has a negative charge.  (Electron)
  • The plum pudding model of the atom was proposed            (J.J. Thomson)
  • The nucleus of an atom contains              .  (Protons and neutrons)
  •               particles has a positive charge.  (Proton)
  • The atomic number of an element is determined by the number of              . (Protons)
  • Isotopes of an element have the same number of              . (Protons)
  •               subatomic particle has a negligible mass.  (Electron)
  • The electron configuration of an atom determines its              .  (Chemical properties)
  • The maximum number of electrons that can occupy the first energy level of an atom is             . (2)
  • The mass number of an atom is equal to the number of             . (Protons and neutrons combined)
  • Oxidation occurs at the              . (Anode)
  • Reduction occurs at the              (Cathode)
  •              is true about oxidation and reduction reactions. (Oxidation involves the loss of electrons)

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  • The electrode where oxidation occurs is called the             (Anode)
  • The electrode where reduction occurs is called the              . (Cathode)
  • In a galvanic cell, the flow of electrons is from the         . (Anode to cathode)
  • The standard reduction potential of a half-reaction           (The potential difference between the standard hydrogen electrode and the electrode in question)
  • The electromotive force (EMF) of a cell is a measure of             . (The potential difference between the anode and cathode)
  •            factor does NOT affect the cell potential.  (Pressure)
  • The Nernst equation relates the cell potential to            (Concentration of reactants)
  •              scientist is credited with the development of the modern periodic table.  (Dmitri Mendeleev)
  • Elements in the periodic table are arranged in order of increasing             . (Atomic number)
  • The horizontal rows in the periodic table are called            . (Periods)
  • The vertical columns in the periodic table are called               . (Groups)
  • Elements in the same group of the periodic table have similar                . (Chemical properties)
  •               group of elements in the periodic table is known as the “alkali metals.  (Group 1)
  •              element is located in period 3 and Group 17 of the periodic table. (Chlorine)
  • The elements in Group 18 of the periodic table are known as             . (Noble gases)
  • The element with atomic number 79 in the periodic table is              . (Gold)
  • The first element in the periodic table is              . (Hydrogen)
  • The shape of a water molecule (H2O) is               .  (Bent)
  •               bond type involves the sharing of electrons between atoms. (Covalent bond)
  • Sigma (σ) bonds present in a triple bond are            . (3)

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  •           . molecule has a linear shape.  (Carbon dioxide (CO2)
  • The molecular geometry of a molecule with four electron groups and no lone pairs is           .  (Tetrahedral)
  •                molecule has a trigonal pyramidal shape. (Ammonia (NH3) )
  • The lone pairs of electrons present in a molecule of oxygen (O2) are             . (0)
  • The bond angle in a molecule with a tetrahedral electron geometry is             . (109.5 degrees)
  •              . molecule has a trigonal bipyramidal shape. (Sulfur hexafluoride (SF6) )
  •                atoms are directly bonded to a central atom in a molecule with an octahedral electron geometry.  (6)
  • In all the three states of water, (i.e. ice, liquid and vapour) chemical composition of water           .  (remains same)
  • The statements is incorrect about the state of matter is            . (Bose-Einstein condensate is formed by heating gas of extremely low density.)
  •             is not a property of gas.  (Gases have a definite shape)
  • A form of matter that has no fixed shape but has a fixed volume. An example of this form of matter is ——.  (kerosene)
  • When heat is constantly supplied by a burner to boiling water, then the temperature of the water during vaporization            . (Does not rise at all)
  • The boiling point of water at sea level is ———————.  (373 K)
  • The process in which solid is directly converted to vapors state is called —————. ( sublimation)
  • The solid which undergoes sublimation is ——————.  (Naphthalene)
  •                            phenomena would increase on rising temperature. (Evaporation, diffusion, expansion of gases)
  •                            conditions is most favourable for converting gas into liquid. (High pressure, low temperature)
  • Mist (دھند) is an example of solution                   .  (Liquid in gas)
  •                 is a ‘ liquid in solid ‘ solution.  (Butter)
  • Concentration is ratio of                .  (solvent to solute,solute to solution)
  •                solution contains more water.   (0.25 M )

Chemistry Tests of Sailors as PakMCQs Chemistry

  • A 5 percent (w/w) sugar solution means that                .  (5 g of sugar is dissolved in 95 g of water)
  • If the solute-solute forces are strong enough than those of solute-solvent forces . The solute                   .  (does not dissolve)
  •                    will show negligible effect of temperature on its solubility.  (NaCl)
  •                    is heterogeneous mixture. (milk of magnesia)
  • Tyndall effect is shown by                   .   (jelly)
  • Tyndall effect is due to                   .   (scattering of beam of light)
  •  If 10 cm3 of alcohol is dissolved in 100 g of water , it is called                   . (% v/w)
  • When a saturated solution is diluted it turns into                   .  (unsaturated solution)
  • Molarity is the number of moles of solute dissolved in                   . (1 dm3 of solution)
  • According to Lewis concept, an acid is                    .  (electron pair acceptor)
  • Ostwald’s dilution law is applicable to                   .  (Weak electrolyte only)
  • The pH of a solution of hydrochloric acid is 4. The molarity of the solution is                . (0.0001)
  • The strong conjugate base is                    .   (CH3COO)
  •                     pairs constitutes a buffer.  (HNO2 and NaNO2)
  • Le Chatelier’s principle is applicable to                    .  (all systems, chemical or physical in equilibrium.)
  •                     is the weakest base.    (NH4OH)
  • When NH4Cl is added to NH4OH solution the dissociation of ammonium hydroxide is reduced. It is due to                    .   (common ion effect)
  • For the reversible reaction N2 (g) + 3H2(g) ⇋ 2NH3 + Heat, The equilibrium shifts in forward direction by                    .  (by increasing pressure and decreasing temperature)
pakmcqs chemistry for sailors job

Pak Navy Chemistry Tests as PakMCQs Chemistry

  • A base according to Bronsted concept is a substance which can                    .  (accept protons)
  • Acid  present in Tomato is                    .    (Oxalic Acid)
  •                      is a strong acid.   (HCl pH 1)
  • Na2CO3.10H2O is known as                    .  (Washing soda)
  • pH value less than 7 indicates that the solution is                    .  (Acidic)
  •                     is neutral salt.    (CH3COONH4)
  • Lactic Acid is present in                    .  (Curd)
  • Farmers neutralise the effect of Acidity on the soil by adding                    .  (Slaked lime)
  •                     are present in a dilute Aqueous solution of hydrochloric acid. (H3O + Cl– )
  • CuSO4.5H2O: In this Compound, the water molecule is called                    .  (Water of crystallisation)
  •                       salts does not contain water of crystallisation.   (Baking soda)
  • In                     pH range does our body work to survive in the atmosphere. (7.0 to 7.8)
  • The chemical formula of POP (Plaster of Paris) is                    .   (CaSO4.1/2H2O)
  •                     salt is acidic in nature.    (NH4Cl)
  • At                     temperature is gypsum heated to form Plaster of Paris.  (100°C)
  • Sodium carbonate reacts with hydrochloric acid and produces                    (NaCl, CO2, H2O )
  •                     acid is present in tamarind.  (Tartaric acid)
  •                    is an example of an aldehyde.   (Formaldehyde)
  • The functional group present in an alcohol is                    .   (-OH (hydroxyl group) )
  •                     is a primary alcohol.    (Methanol)
  • The reaction between an acid and an alcohol to form an ester is called                    . (Esterification reaction)
  • The general formula for an alkane is                    .   (CnH2n+2 )
  •                    is an example of a saturated hydrocarbon.   (Methane)
  •                     is a characteristic of aromatic compounds.  (They have a planar structure)
  • The process of converting an alkene into an alkane is called                    . (Hydrogenation)
  • The functional group present in a carboxylic acid is                    . (-COOH (carboxylic acid group) )
  •                    is an example of a nucleophile.   (Alcohol)

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