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The pair of compounds having metals in their highest oxidation state is :

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On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam :

If the number of terms in the expansion of $(1−x2 +x_{2}4 )_{n},x=0,$is 28, then the sum of the coefficients of all the terms in this expansion, is :

If $y=sec(tan_{−1}x)$, then $dxdy $at $x=1$is equal to

The coagulating power of electrolytes having ions $Na_{+},Al_{3+}andBa_{2+}$ for arsenic sulphide sol increases in the order:

Consider :Statement I : $(p^q)pq^ ^ $is a fallacy.Statement II : $(pq )↔(q p)$is a tautology.

A train is moving on a straight track with speed $20ms_{−1}$. It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound $=320ms_{−1}$) close to :

If z is a complex number of unit modulus and argument q, then $arg(1+z1+z )$equal

The number of integers greater than $6,000$ that can be formed, using the digits $3,5,6,7and8,$ without repetition, is :