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The pair in which phosphorous atoms have a formal oxidation state of +3 is:

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The period of oscillation of a simple pendulum is $T=2πgL .$ Measured value of L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using wrist watch of 1 s resolution. The accuracy in the determination of g is :

In the circuit shown, the current in the $1Ω$ resistor is :

Let A and B be two events such that $p(A∪B)=61 ,p(A∩B)=41 $ and $p(A)=41 $, where $A$stands for thecomplement of the event A. Then the events A and B are

Two short bar magnets of length 1 cm each have magnetic moments $1.20Am_{2}and1.00Am_{2}$ respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid - point O of the line joining their centres is close to (Horizontal component of earths magnetic induction is $3.6×10_{−5}Wb/m_{2})$

If 12 identical balls are to be placed in 3 identical boxes, then the probability that one of the boxes contains exactly 3 balls is :

Stability of the species $Li_{2},Li_{2}andLi_{2}$ increases in the order of:

A solution of (-) –1 - chloro - 1 - phenylethane is toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :

The standard Gibbs energy change at 300 K for the reaction $2A⇔B+C$ is $2494.2J.$ At a given time, the composition of the reaction mixture is $[A]=21 ,[B]=2and[C]=21 .$ The reaction proceeds in the : $[R=8.314J/K/mol,e=2.718]$