A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then, the true statement about the scale reading is

the scale of the lower one reads M kg and of the upper one zero

the reading of the two scales can be anything, but the sum of the reading will be M kg

The effect on the interference fringes if the monochromatic source is replaced by a source of white light would be:

Interference pattern disappears

Fringe separation remains fixed

Fringe closest to the central fringe is red.

For a first order reaction A P, the temperature (T) dependent rate constant (k) was found to follow the equation log The pre-exponential factor A and the activation energy E a respectively are

1.0 × 10 6 s -1 and 9.2 kJ mol -1

1.0 × 10 6 s -1 and 16.6 kJ mol -1

1.0 × 10 6 s -1 and 38.3 kJ mol -1

Identify the incorrect statement.

Cl 2 reacts with excess of NH 3 to give N 2 and HCl.

Br 2 reacts with hot and strong NaOH solution to give NaBr, NaBrO 3 and H 2 O.

Ozone reacts with SO 2 to give SO 3 .

Silicon reacts with NaOH(aq) in the presence of air to give Na 2 SiO 3 and H 2 O.

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