No. If a card effect would cause a Synchro Monster to be returned to the Deck or the hand, it is placed back in the Extra Deck instead.
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Generally, Synchro Summoning sends cards from the field to the Graveyard. There are some cards that allow you to use monsters in your hand as Synchro Material Monsters instead, such as Eccentric Boy.Eccentric BoyAttribute: WINDType: Spellcaster/Tuner/EffectLevel: 3ATK: 800DEF: 200When using this card as a Synchro Material Monster, the other Synchro Material Monsters is 1 monster in your hand. The Synchro Monster that used this card as a Synchro Material Monster cannot activate its effect, its effect(s) is negated, and is removed from play when removed from the field.
No, Synchro material must be face-up.
No, you do not 'tribute' the Synchro Material for a Synchro Summon. They are sent to the graveyard, not tributed. You can tribute an opponents synchro monster for "Assault Mode Activate!" to summon the assault mode monster from your deck.
The conditions for Synchro Summoning are the same as in real life:You must have a face-up Tuner monster and non-Tuner monster(s) on your side of the field.The combined levels of the monsters must equal that of the Synchro Monster you want to Synchro Summon from your Extra Deck.If there are any specific monsters or types of monsters listed on the Synchro Monster, that/ those monster/ monsters must be face-up on the field.Once the above conditions are met, you must:Select your Extra Deck, then select "Activate".From there, you will see a window pop up of the possible monster(s) to Synchro Summon. Select one of the Synchro Monsters.Now select which cards on your side of the field to send to the Graveyard; they will have an outline around them.After a short animation, select if you want you Syncho Monster to appear on the field in face-up attack or defense position and you will Synchro Summon your Synchro Monster.
The situation that you are describing, in the first place, cannot exist (a Fusion monster being in your hand). If a Fusion monster on the field is supposed to be "sent to the top of the owner's deck" or "returned to the owner's hand" by an effect it is instead returned to the Extra/ Fusion deck.