NDA Chemistry 2019/2020 Past Questions

Which of the following exhibits resonance

On exposing palm wine to air for some days, it becomes sour owing to the conversion of

When acidified KmNO₄ solution is decolorized by ethane, the gas acts as

What amount of hydrogen will be required for complete hydrogenation of one mole of pent-3-yne.

When excess carbon(iv)oxide is passed into lime water, the turbidity produced initially disappears due to the formation of

The following substances are non-electrolytes except

The hydrolysis of NH₄CI salt will give

Which of the following gases dissolves in water vapour to produce acid rain during rainfall?

Which of the following is not allotrope of carbon?

Which oxide is amphiprotic (amphoteric)?

The IUPAC name for the compound below is

Metal salts of long chain fatty acids are known as

The boiling of fat and aqueous caustic soda is referred to as

Hydrogen is released when dilute hydrochloric acid reacts with

Which of the following chlorides would exhibit the least ionic character?

The best way of collecting chlorine is

The chemical reaction which takes place at the anode (positive electrode) in electrolysis is

An clement X has 127 neutrons and 82 electrons. Its atomic number is

If 1 mole of aluminium contains 6 x e atoms of aluminium, how many atoms are contained in 0.09 g of aluminium (Al = 27)?

An element L forms the compounds with chlorine LCl₂, LCI₃, LCl₄. This illustrate the

An example of a suspension of solid particles in a gas is

In which of the following is the change in entroypy positive?

2SO_2(g) + O_2(g) <---> 2SO_3(g) ∆H = -ve The formation of SO₃ in the equation above will be favoured by

When ²³⁸₉₂U emits and x-ray and a B-ray, the product X has a mass number and an atomic number respectively

The producer gas is a mixture of

An excess 0.10moldm^-3 HCl was poured into a big beaker containing 2g of limestone. The unreacted acid required 25cm³ of 0.10moldm^-3 potassium carbonate to neutralize it. What was the original volume of the acid? [Ca = 40, C = 12, 0 = 16]

During the electrolysis of dilute tetraoxsulphate(VI) acid solution, 0.05 mole of electrons were passed. What volume of gas was produced at the anode?

Platinum electrodes are dipped into copper sulphate solution in a voltameter. The solution left after electrolysis is,

What volume of water is produced when a mixture of 150cm^3 of hydrogen and 100cm³ of oxygen is exploded in a eudiometer?

Given the half-cell reaction, 2Br ⟶ Br2, how many moles of electron will be required to produce 0.56dm3 of bromine at s.t.p.? [molar volume of gas at s.t.p. = 22.4dm3]

Which of the following ions is acidic?

The air pollutant unknown in nature is

The chromatographic separation of ink is based on the ability of the component to

A liquid that will dissolve fat is

25cm³ if a gas x combines z molecules at 15°C and 75mmHg. How many molecules will 25cm³ of another gas y contain at the same temperature and pressure?

What quantity of electrons (in mole) is lost when one more of iron (II) ions oxidize to form iron (III) ions?

The common feathers of reactions at the anode is that

Ethene undergoes mainly addition reactions because it is

The position of equipment in a reversible reaction is affected by

The reactions between alkanoic acids and alkanoic in the presence of a mineral acid is known as