The specific heat of water is $1 c a l g^{- 1}^{o} C^{- 1}$ . Its value in S.I. units is approximately

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4.2

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420

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4200

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Solution

The correct option is D 4200
The specific heat of water is $1 c a l g^{- 1 o} C^{- 1}$ .
$1 c a l = 4.2 J, 1 k g = 1000 g$
SI unit is $1 j k g^{- 1 o} C^{- 1}$ using above transform we get
$1 c a l g^{- 1 o} C^{- 1} =$ $4200 J k g^{- 1 o} C^{- 1}$

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