Half-lives of elements A and B are 1h and 2h respectively. Which of the following is correct?

Which of the following is/are correct for H atom?

If electronegativity of element A,B,C & D are 1.2, 3, 1.8 & 2.8 respectively then which of the following hydroxide is most basic in nature in aqueous solution:- Question Type: Single Correct Type (1) A-O-H (2) B-O-H (3) C-O-H (4) D-O-H

If A, G and H are the arithmetic, geometric and harmonic means between a and b respectively, then which one of the following relations is correct?

The angles of elevation of the top of a tower from the top and foot of a pole are respectively 30^(@) and 45^(@) . If h_(T) is the height of the tower and h_(P) is the height of the pole, then which of the following are correct? 1. (2h_(P)h_(T))/(3+sqrt(3))=h_(P)^(2) " " 2. (h_(T)-h_(P))/(sqrt(3)+1)=(h_(P))/(2) 3. (2(h_(P)+h_(T)))/(h_(P))=4+sqrt(3) Select the correct answer using the code given below.