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Aqueous solution of which salt will not contain ons with the electronic configuration $1s_{2}2s_{2}2p_{6}3s_{2}3p_{6}$?

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If the coefficients of $x_{3}$and $x_{4}$in the expansion of $(1+ax+bx_{2})(1−2x)_{18}$in powers of x are both zero, then (a, b) is equal to

The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is :

Arrange the following compounds in order of decreasing acidity:

If the vectors $AB=3i^+4k^$ and $AC=5i^−2j^ +4k^$are the sides of a triangle ABC, then the length of the median through A is

A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of $CO_{2}.$ The empirical formula of the hydrocarbon is:

If $∫f(x)dx=ψ(x)$, then $∫x_{5}f(x_{3})dx$is equal to

The negation of $s∨(r∧s)$ is equivalent to :

A sonometer wire of length 1.5 m is made of steel. The tension in it produces an elastic strain of 1 %. What is the fundamental frequency of steel if density and elasticity of steel are $7.7×10_{3}kg/m_{3}and2.2×10_{11}N/m_{2}$ respectively?