Red hot carbon will remove oxygen from the oxides `XO` and `Yo` but not from `ZO.Y` will remove oxygen from `XO`. Use this evidence to deduce the order of activity of the three metals `X,Y,` and `Z,` putting the most reactive first.

Red hot carbon removes oxygen from the oxide XO and YO but not from ZO. Y will remove oxygen from XO. Use this evidence to deduce the order of activity of the three metals X, Y and Z putting the most active first.

Red hot carbon will remove oxygen from the oxides XO and YO but not form ZO . Y will remove oxygen from XO . Use this evidence to reduce the order of activity of the three metals X,Y and Z putting the most reactive first :

Red hot carbon will remove oxygen from the oxide XO " and " YO but not from ZO . Y will remove oxygen from XO . Use this evidence to deduce the order of acitivity of the three metals X, Y and Z putting the most active frist:

An amount of Rs 7000 is invested in three types of investments x,y and z the rate of 3%, 4%, and 5% interst respectively. The total annual income is Rs 280. If the combined income from x and y is Rs 80 more than that from z, then (i) Represent the above situation in form of linear equations. (ii) Is it possible to frame the given linear equations in the form of matrix to obtain the three values x, y and z using matrix multiplication? If yes, find. (iii) Which value is more beneficial to invest?

A black metal oxide XO_(2) is used as catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO_(2) is also used in ordinary dry cells. The metal oxide XO_(2) cannot be reduced satisfactorily with carbon to form metal X. (a) Name the metal X. (b) Name the metal oxide XO_(2) (c) Which reducing agent can be used to reduce XO_(2) to obtain metal X? (d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.