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NDA – Chemistry – 2003

Challengemoi - NDA Past Questions and Answers

This quiz consist of over 50 NDA Chemistry past questions and answers. The answers are well explained. Retake the quiz as many times as you feel the need. Success!

This is a timed quiz. You will be given 1200 seconds to answer all questions. Are you ready?

1200

Calculate the root mean square velocity of propane molecules at 27oC. (C = 12, H = 1)

Correct! Wrong!

CaIculate the volume of 0.1M hydrochloric acid which would exactly react with 25cm3 of 0.5 mol of sodium hydroxide.

Correct! Wrong!

The following are colligative properties of solution except

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Which of the following is the true equation representing the action of dil nitric acid on copper'?

Correct! Wrong!

Permanent hardness of water is due to the presence of calcium sulphate and is not softened by boiling. Which of the following chemical is normally used to soften it?

Correct! Wrong!

In group IV - Vll the valency exhibited by an element is the

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Which compound sucrose or sucrose octa-acetate would you expect to be more soluble in water dichloromethane?

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Which of the following statement is correct when hydrogen peroxide reacts with acidified potassium iodide solution,

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Nitrogen is very uncreative because

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A compound and its solution in water are black, it probably means that

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The root mean (rms) speed of H2 at a fixed temperature T, is 1600 m/sec. What is the (rms) speed O2 at the same temperature?

Hint: rms = square-root 3RT
Show hint
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The driving tendency of a reaction is from left to right, when

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The electronic configuration of Ca = [Ar] 3do4s2 which is most correct among the following

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2.40g of Copper (II) tetra-oxosulphate (VI) crystals are prepared from 0.45g of copper (II) oxide. The copper (II) tetraoxosulphate (VI) crystals contain 0.45g of water of crystallization. What mass of water crystallization would be obtained from 1.2g of copper (II) oxide

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Calculate the mass of trioxonitrate (V) acid necessary to react with 10g of Lead oxide and the mass of Lead trioxonitrate (V) salt formed in the (pb= 207, N = 14, H = 1, O = 16)

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A suitable indicator used titration of oxalic acid and sodium hydroxide

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It is impossible to define simultaneously the exact momentum and position of a body. This is

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Choose a suitable indicator for the reaction between tetraoxosulphate(VI) acid and sodium hydroxide below

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What mass of silver is deposited when 96500 C of electricity is passed through a solution containing silver ions?

(Ag = 108, 1F = 96500C)
Show hint
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The volume of a given mass of gas is 360 cm3 at 15oC, at what temperature will the volume be 480 cm3 assuming constant pressure?

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Sublimation can be used to separate this mixture of compound

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The chemical laws between the elements are collectively known as:

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Calculate the mass of hydrogen formed when 0.81g of sodium react with water

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Epsom salts contains 9.8% Mg, 13.0% S, 26.0% oxygen and 51.2% H2O is the formula of the compound (Mg=24 S = 32, O = 16, H = 1)

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Sulphur oxide is prepared by the action of conc H2SO4 on copper. The gas SO2, produced is moist and is dried by passing the gas

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A compound and its solution in water are colourless because

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Calculate the concentration in mol/dm3 of a solution containing 1.6g of copper tetra-oxosulpahte(vi) in 250cm3

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A 0.512cm3 sample of a gas weigh 1.236g at 20oC and a pressure of one atmosphere. Calculate the relative molecular mass of the gas. (R = 8.314KJ-1mol-1)

Hint: M = nRT/PV
1 atm pressure = 101325Nm-2
Show hint
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The solubility of sugar at 50oC is 260g/100g water and at 0oC is 180g/100g water. What mass of sugar will deposited if 60g of the saturated solution at 50oC, is cooled to 0oC?

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Which of the following elements has the least number of electrons in its outer-most shell?

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When liquid was left open to the atmosphere, some-particles escape into the gas phase by means of evaporation. The rate of this evaporation increases with the exception of:

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When the pressure applied to a concentrated solution is greater than the osmotic pressure solvent flows from the concentrated solution through the membrane into the dilute solution. This process is referred to as

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Calculate the mass of solute in 50cm3 of 0.25mndm3 sodium trioxocarbonate (IV). (Na = 23, C = 12, O = 16)

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Select the equation representing the action of steam on red hot iron.

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The existence of fractional atomic weights can be explained by

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Aqua-regia is a mixture Of

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Which of the following chemical reaction is not exothermic?

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Potassium nitrate decompose according to the equation 2KNO3--> 2KNO2+O2. What is the volume of oxygen at STP that can be produced from 101 g of potassium nitrate? (k = 39, N=14, 0=16)

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In NO-3+8H++6e-->NH3+OH+2H2O; the Nitrogen is reduced from the oxidation state

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Monoclinic and Rhombic Sulphur are two allotoropic forms of sulphur. The forms differ from each other in their

Correct! Wrong!

NDA - Chemistry - 2003
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