Which compound is referred to as "white vitriol"?

In the following question, select the missing number from the given series. 

142, 150, 123, 187, 62, ? 

Select the figure from the options that when placed in the blank space of the given figure will complete the pattern.

Select the correct combination of mathematical signs to sequentially replace the * signs and balance the given equation.

33 * 4 * 15 * 3 * 61 = 188

Choose the right water image of the given question from the given options.

Which one of the following is NOT an element?

Select the figure from the given options that when put in place of the question mark (?) will logically complete the series. 

Select the number from the given options to complete the series.

35, 38, 43, 50, 59, ___

In a certain code language, if ‘raghav plays hockey’ is written as ‘xfjdni rzzmo ubghzs’, then ‘arun works  hard’ will be written as: