Gamma rays have no charge and no mass. They are: MCQ with Answer and Explanation

Explanation:
Atomic radius decreases across a period because the effective nuclear charge increases while electrons are added to the same shell, pulling the electron cloud closer. Down a group, radius increases due to addition of new shells.

Explanation:
Phenolphthalein is a synthetic acid-base indicator, organic compound prepared in the lab. Litmus is a natural dye from lichens. Turmeric is a natural indicator (yellow in acid, reddish brown in base). Red cabbage juice is natural. Synthetic indicators are often used in titrations: methyl orange, phenolphthalein.

Explanation:
Cathode is where reduction (gain of electrons) takes place in both electrolytic and galvanic cells. Anode is where oxidation occurs. Mnemonic: RED CAT (Reduction at Cathode), AN OX (Oxidation at Anode).