Chemistry - Study Mode

[#391] The most extensive, commercially useful source of thorium as monazite sand occurs in India at
Correct Answer

(B) Travancore coast

Explanation

Solution: The most extensive, commercially useful source of thorium as monazite sand occurs in India at Travancore coast.

[#392] The main active constituent of tea and coffee is
Correct Answer

(C) caffeine

Explanation

Solution: Caffeine is the main active constituent of tea and coffee.

[#393] The maximum number of isomers for an alkene with molecular formula C 4 H 8 is
Correct Answer

(B) 4

Explanation

Solution: The maximum number of isomers for an alkene with molecular formula C 4 H 8 is 4.

[#394] What is the mass percentage of oxygen in carbon dioxide (CO 2 )?
Correct Answer

(D) 72.7 %

Explanation

Solution: The mass percentage of oxygen in carbon dioxide is 72.7 %.

[#395] Number of 6.023 × 10 23 atoms present in one mole of a gas at STP is
Correct Answer

(B) 6.023 × 10 23

Explanation

Solution: Number of 6.023 × 10 23 atoms present in one mole of a gas at STP is 6.023 × 10 23 .