Chemistry Questions & Answers (Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)

The reaction

Consider the following compounds

A device that converts energy of combustion of fuels
like hydrogen and methane, directly into electrical
energy is known as :-

In which of the following compounds, then C - Cl
bond ionisation shall give most stable carbonium ion?

The number of d-electrons in Fe²+ (Z = 26) is not
equal to the number of electrons in which one of
the following?

If the value of an equilibrium constant for a particular reaction is 1.6 × 10¹², then at equilibrium the system will contain :-

Maximum bond angle at nitrogen is present in which
of the following ?

Solubility of the alkaline earth's metal sulphates in
water decreases in the sequence :-

The total number of p-bond electrons in the following
structure is :-

Nitrogen dioxide and sulphur dioxide have some
properties in common. Which property is shown by
one of these compounds, but not by the other ?

Which one of the following electrolytes has the same
value of van't Hoff's factor (i) as that of the Al₂(SO₄)₃

(If all are 100% ionised)

A given metal crystallizes out with a cubic structure
having edge length of 361 pm. If there are four
metal atoms in one unit cell, what is the radius of
one atom?

Magnetic moment 2.84 B.M. is given by :-

(At. nos, Ni = 28, Ti = 22, Cr = 24, Co = 27)

The electrolytic reduction of nitrobenzene in strongly
acidic medium produces :-

Which of the following options represents the correct
bond order ?

An organic compound 'X' having molecular formula
C₅H_10O yields phenyl hydrazone and gives negative
response to the Iodoform test and Tollen's test. It
produces n-pentane on reduction. 'X' could be :-

Which of the following pairs of ions are isoelectronic
and isostructural ?

The activation energy of a reaction can be
determined from the slope of which of the following
graphs ?

The species Ar, K+ and Ca²⁺ contain the same
number of electrons. In which order do their radii
increase ?

The correct bond order in the following species is:-

"Metals are usually not found as nitrates in their
ores".
Out of the following two (a and b) reasons which
is/are true for the above observation ?
(a) Metal nitrates are highly unstable.
(b) Metal nitrates are highly soluble in water.

Bithional is generally added to the soaps as an
additive to function as a/an :-

The Ksp of Ag₂CrO₄, AgCl, AgBr and AgI are
respectively, 1.1 × 10^–12, 1.8 × 10^–10, 5.0 × 10^–13,
8.3 × 10^–17. Which one of the following salts will
precipitate last if AgNO3 solution is added to the
solution containing equal moles of NaCl, NaBr, NaI
and Na₂CrO₄ ?

 In Duma's method for estimation of nitrogen, 0.25
g of an organic compound gave 40 mL of nitrogen
collected at 300 K temperature and 725 mm pressure.
If the aqueous tension at 300 K is 25 mm, the
percentage of nitrogen in the compound is :-

The reaction of C6H5CH = CHCH3 with HBr
produces:-

the central dogma of molecular genetics states that the genetic information flows from

Which one of the following nitro-compounds does not react with nitrous acid