If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula

\( ^{234}_{90}Th → ^{234}_{91}Pa + X \) In the nuclear reaction above, X is

The type of reaction ethyne mainly undergoes is

Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below? M(s)+2HC1(aq) → MCI2 (aq) + H2(g)

When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as

The most efficient absorber of ultraviolet radiation in the atmosphere is

Chlorine atom forms Cl- by

What is the colour of phenolphthalein indicator in a basic medium?

Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m5Nm-2pressure becomes 300cm3 at 1.0 × 105Nm-2 pressure?