Chemistry — 1997

The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as?

The mass number of an element is the sum of its

How many unpaired electrons are there in an atom of an element with the following electronic configuration? 1s 2 2s 2 2p 6

Radon is used as a tracer in medical research because it

What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?

In linear molecules, the bond angle is

A sodium atom and a sodium ion have the same

If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is

An increase in the pressure of a gas results in a decrease in its

A given volume of methane diffuses in 20 seconds. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions? [CH\(_4\) = 16; SO\(_2\) = 64]

An acid is a substance which in the presence of water produces

Which of the following is a general method of preparing acids?

Which of the following is a general method of preparing acids?

The loss of molecules of water of crystallization to the atmosphere by some crystalline salts is known as

Which of the following ions will migrate to the cathode during electrolysis?

What quantity of electrons (in mole) is lost when one mole of iron (ll) ions is oxidized to iron (lll) ions?

The common feature of reactions at the anode is that

From the following equations, what is the order of decreasing reactivity of X, Y and Z? Y (s) + X 2+ (aq) → Y 2+ (aq) + X (s) X (s) + Z 2+ (aq) → X 2+ (aq) + Z (s)

What is the value of x in the following equation? MnO- 4 + 4H + + xe- → MnO 2 + 2H 2 O

If the value of ∆H for a reaction is negative, it means that the reaction is

How much heat will be liberated if 8g of hydrogen burns in excess oxygen according to the following equation? 2H 2 + O 2 → 2H 2 O,∆H = -571.7KJ (H = 1)

The position of equilibrium in a reversible reaction is affected by

Separation of mixture of solids by physical methods can be based on differences in the following except

Ethene undergoes mainly addition reactions because it is

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

Which of the following is the relative molecular mass of a compound which has empirical formula CH\(_2\)O? (H = 1; C = 12; O = 16)

The by-product of the fermentation of sugar to ethanol is

Alkanes react with the halogens mainly by

Which of the following is used widely in the manufacture of flavours and perfumes?

The use of diamond in abrasives is due ti its

Which of the substance lettered P to V in the equation below would be left on the filter paper if the reaction mixture were filtered? P (aq) + Q (aq) → V (s) + R (aq) + T (g)

When chlorine is added to slaked lime, the product obtained is

Which of the following when heated strongly in air will leave a metal as residue?

Which of the following is used as water softener?

The following oxides react with both acids and bases to form salts except

Which of the following metals is not extracted by electrolysis ?

Which of the following is an ore of aluminium?

Lead and tin are the components of

An atom 17 protons, 17 electrons and 18 neutrons has a mass number of

If an element R belongs to the same group as sodium, an aqueous solution of ROH will

Element X, with electronic configuration 2, 8, 2 and element Y with electronic configuration 2, 8, 7 are like to combine by

The valence electrons of element 12 Mg are in the

Which of the following statements is correct about sodium chloride in the solid state?

Which of the following Group 1 elements has the highest ionization energy?

Boyle's law can be expressed mathematically as

What volume of oxygen at s.t.p would react with carbon to form 4.40g of CO 2 according to the following equation? C (s) + O 2(g) → CO 2(g) [O = 16; C =12; 1 mole of a gas occupies 22.4dm 3 at s.t.p]

A mixture of NaCI (s) and CaCO 3(s) is best separated by

What is the basicity of the acid in the followed reaction? NaCO + 2CHCOOH → 2CH COONa + H 2 O + CO 2