NDA Chemistry 2015/2016 Past Questions

The apparatus used in the industrial separation of crude oil into its various fractions

Which of the following statements is not correct about group VII elements? They are

Which of the following molecules has two lone pairs of electrons and is SP³ hybridised?

What is the half-life of a radioactive nuclide whose decay constant is 0.0522yr^-1

In the reaction 4NH_3(g) + 5O_2(g) ⟶ 4NO_(g) + 6H₂O, 1.0mol of ammonia and 1.0mol of oxygen are made to react. Therefore,

Steam changes the colour of anhydrous cobalt (II) chloride from

The electronic configuration of excited carbon atom is

For the reaction: 2H⁺ + Zn ⟶ H₂ + Zn²⁺
∆G = -147KJmol. What is the corresponding value of E° cell?

The atomic number of Iron is 26. What is the number of unpaired electrons in Fe³⁺

Baking soda and hydrochloric acid react according to the following equation:
NaHCO_3(aq) + HCl_(aq) ⟶ NaCl_(aq) + CO_2(g) + H₂O_(g) Calculate the mass of baking soda (NaHCO₃) that would produce 10.0g of carbon (IV) oxide [Cl = 35.5, Na 23.0, O = 16, C = 12 H = 1]

What is the main gas found in the air we breathe?

What is the first most abundant element in the universe in terms of mass

The most common bleaching agent is?

The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is'?

Which is the chemical formula for Iron (III) sulphate

NH₄Cl_(s) ⇋ NH_3(g) + HCl_(g)
The reaction above can only attain equilibrium if?

For elements in the left-most column of the Periodic Table, properties that have increasing values as the atomic number increases, include which of the following?
I Ionization Energy (Potential)
II Atomic radius
III Atomic mass

The number of oxygen atoms in 0.50 Mole of KHSO₄ is

Which of the following is not a separation technique?

An increase in the rate of a chemical reaction on heating is due to an increase in

Calculate the mass of solute in 50cm³ of 0.25mdm^-3 sodium trioxocarbonate (IV)
(Na = 23, C= 12, O = 16).

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_____

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

Nitrogen is very uncreative because

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, O = 16, H = 1)

X has an empirical formula C₂H₅, and relative molecular mass of 58. X is

The cracking of petroleum increases the yield of gasoline because it converts

what is the pH of 0.01 M hydrochloric acid solution?

Aqua-regia is a mixture of_____

Graphite conducts electricity because?

Which of the following compounds is composed of Al, Si, O and H?

The nucleus of an atom consists of

What is the advantage of an alloying lead with tin?

Which of the following statement is correct about Osmotic Pressure

In the Haber process for the manufacture of ammonium, the catalyst commonly used is finely divided

A mixture of sand, ammonium chloride and sodium is best separated by

The densities of two gases, X and Y, are 0.5g dm^-3 and 2.0g dm^-3 respectively. What is the rate of diffusion of X relative to Y?

The number of electrons in the valence shell of an element of atomic number 14 is

A solid that absorbs water from the atmosphere and forms an aqueous solution is

How many moles of HCl will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?