Which of the following statement (s) is/...

Which of the following statement `(s)` is`//`are correct ?

Mendeleev's periodic law was based on atomic number of the element.

Zero group was not present in the periodic table when Mendeleev presented it.

The effective nuclear charge `(Z_(eff))` is the atomic number minus shielding effect.

There are four transition series in the periodic table each one consists of `10` elements.

Text Solution

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The correct Answer is:

B, C, D

Statement (b,c and d) are correct.
a. False. Thus law was based on atomic masses of the elements.

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Which of the following statements (s) is/are correct ?

In an inertial frame `W_("conservative") +W_("non-conservative") + W_("other -force") = K _(2) - K_(1)`

In a non - inertial frame : `W_("conservative") +W_("non conservative ") +W_("other -force") +W_("pseudo - force ") = K_(2) - K_(1)`

Work done by conservative forces is independent of path followed .

Work done by non - conservative forces depends on path followed .

Which of the following statements (s) is (are) correct?

The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons

The rest mass of a stable nucleus is greater than the rest masses of its separated nucleons

The nuclear fusion, energy is released by fusing two nuclei of medium mass. (approx. 100 am u)

In nuclear fission, energy is released by fragmentation of a very heavy nucleus.

Which of the following statements(s) is/are correct?

Aldehydes are generally oxidised under vigorous conditions

Ketones are easily oxidised to carboxylic acids even under mild oxidising agents

Oxidation of ketone involves carbon-carbon bond cleavage to give a mixture of carboxylic acids having lesser number of carbon atoms than the parent ketones

All of the above