All three gears on the chain ring are riveted together and fixed to the crank arm, getting a bit perplexed at the moment.
It appears that all bike chain is of the same pitch.Must admit I thought the same ie a mismatch between chain and sprockets but got them both from Halfords where you do not get a choice !
The chain fits correctly over the front rings.
Ditto, some cheaper chains have rivet ends that can catch on sprocket ramps, made worse sometimes by poor profiling of the outer chain plates.Should be compatible then. Personally, i always buy Shimano or SRAM for drivetrain components (Shimano for 'rings and cassettes/freewheels and SRAM for chains usually), the smaller brands or unbranded stuff can often perform poorly, or wear out very fast.