NDA Chemistry 2011/2012 Past Questions

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

Which of these groups of elements react with cold water?

To 2.0cm³ of a solution of sample X, NaOH solution was added drop by drop until in excess, a reddish-brown ppt insoluble in excess NaOH. The cation contained in sample X is:

Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore,

Complete oxidation of CH₃CH₂CH₂OH yields:

Give the IUPAC name for this compound

The ground state electronic configuration of calcium, Ca (Z = 20) is:

What type of bond is indicated by the arrow in the following structure?
$[\table , , H, , ; , , ∣, ; H , -, N, -, H; , , ∣, , ; , , H, ;]^+$

Which of the following reactions gives the silver mirror product.

The product of the reaction: Benzene + CH₃COCl (with AlCl₃ as catalyst) is ⟶

Potassium nitrate decomposes according to the equation 2KNO₃ ⟶ 2KNO₂ + O₂. What volume of oxygen will be produced at STP? Given (N=14, O=16, K=39).

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

Which of the following chemical reaction is not exothermic?

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

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

A suitable indicator used for titration of oxalic acid and sodium hydroxide is.

Which of the following mixtures can be separated by Sublimation?

In the equation below:
NO₃^- + 8H⁺ ⟶ NH₃ + 2H₂O
Nitrogen is reduced from oxidation state.

Nitrogen is very uncreative because_____

A brand of ink containing cobalt (II), copper (II) and iron can best be separated into its various components by:

Which of the following substances is a mixture?

The atomic numbers of two elements X and Y are 12 and 9 respectively. The bond in the compound formed between the two elements is?

In the purification of town water supply, alum is used principally to:

An increase in temperature causes an increase in the pressure and the _____

The energy change accompanying the addition of an electron to a gaseous atom is called:

An eruption polluted an environment with a gas suspected to be H₂S, a poisonous gas. A rescue team should spray the environment with:

The atomic number of Cesium is 55 and its atomic mass is 133. The nucleus of the Cesium atom therefore contains:

Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is a noble gas?

If ZnO dissolves in sodium hydroxide and mineral acid solutions to give soluble products in each case, ZnO is therefore referred to as:

Chromatography is used to separate components of mixtures which differ in their rates of

Which of the following is an example of a chemical change?

The number of Hydrogen ions in 4.9g of tetraoxosulphate (V) acid is
[S = 32, O = 16, H = 1, N_A = 6.02 x 10²³]

What volume of oxygen will remain after reacting 8cm³ of hydrogen with 20cm³ of oxygen?

A gas sample with an initial volume of 3.25dm³ is heated and allowed to expand to 9.75dm³ at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature?

Two cylinders A and B each contain 30cm³ of oxygen and nitrogen respectively at the same temperature and pressure. If there are 5.0 moles of nitrogen, then the mass of oxygen is

A liquid begins to boil when______

A particle that contains 8 protons, 9 neutrons and 7 electrons could be written as

Use the periodic table below to answer questions 39 and 40

1							L
G	X	5	6	7	J	E	10
11	M	R	14	15	T	17	18

Which of the letters indicate an alkaline metal and a noble gas respectively?

Use the periodic table below to answer questions 39 and 40

1							L
G	X	5	6	7	J	E	10
11	M	R	14	15	T	17	18

Which letter represents a non-metal that is a solid at room temperature?

The law which states that the amount a gas dissolved in a liquid is proportional to its partial pressure is ___.