Which of the following is correct about atomic size and electronegativity along a period from left to right?

P. decreases, Increases
Q. increases, Increases
R. increases, Decreases

1. Only P
2. Only Q
3. Only R
4. Both P and Q

A compound which liberates reddish brown gas around the anode during electrolysis in its molten state is

1. lead (II) nitrate
2. lead (II) sulphate
3. lead (II) oxalate
4. lead (II) bromide

The atomic mass of sulphur (S), oxygen (O) and carbon (C) are approximately 32, 16 and 12 respectively. Which of the following statements regarding the number of mole in 88 g of CO₂ and 128 g of SO₂ is correct?

P. 88g of CO₂ contains equal number of moles in 128 g of SO₂.

Q. 88g of CO₂ contains double the number of moles in 128g of SO₂

1. Only P
2. Only Q
3. Both P and Q
4. Neither P nor Q

The metal whose hydroxide is soluble in excess of sodium hydroxide solution is

1. magnesium
2. lead
3. silver
4. copper