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For the identification of β-naphthol using dye test, it is necessary to use
(A) dichloromethane solution of β-naphthol.
(B) acidic solution of β-naphthol.
(C) neutral solution of β-naphthol.
(D) alkaline solution of β-naphthol.

Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is
(A) Be2
(B) B2
(C) C2
(D) N2

Six cards and six envelopes are numbered 1,2,3,4,5,6 and cards are to be placed in envelopes so that each envelope contains exactly one card and no card is placed in the envelope bearing the same number and moreover the card numbered 1 is always placed in envelope numbered 2. Then the number of ways it can be done is
(A) 264
(B) 265
(C) 53
(D)67

Heater of an electric kettle is made of a wire of length L and diameter d. It takes 4 minutes to raise the temperature of 0.5kgwater by 40K. This heater is replaced by a new heater having two wires of the same material, each of length L and diameter 2d.The way these wires are connected is given in the options. How much time in minutes will it take to raise the temperature of the same amount of water by 40 K?
(A)4 if wires are in parallel
(B) 2 if wires are in series
(C)1 if wires are in series
(D)0.5 if wires are in parallel





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