In a family of four person 15 chapaties were consumed in a day. `1/5` of the chapaties were commmed by the mother and `3/5` were consumed by the children and the remaining were eaten by the father : What fraction of the total chapaties has been eaten by the father?

In a family of four person 15 chapaties were consumed in a day. 1/5 of the chapaties were commmed by the mother and 3/5 were consumed by the children and the remaining were eaten by the father : How many chapaties were eaten by the mother?

In a family of four person 15 chapaties were consumed in a day. 1/5 of the chapaties were commmed by the mother and 3/5 were consumed by the children and the remaining were eaten by the father : How many chapaties were eaten by the children?

A sample of FeSO_(4).7H_(2)O crystals has been left open to the air and some of the iron (II) has been converted to iron (III). 4.2 gm of the impure crystals were dissolved in a total 250 cm^(3) water and dilute sulphuric acid. 25cm^(3) portion of this solution was titrated with a solution of potenssium bicarbonate. The concentration of dichromate (VI) ions in this solution was 0.1"mol"dm^(-3) . The averge volume used was 23.5cm^(3) o.2 mol dm^(-3) . The average volume used to 23.5cm^(3) . The percentage purity of the cyrstal is

A sample of FeSO_(4).7H_(2)O crystals has been left open to the air and some of the iron (II) has been converted to iron (III). 4.2 gm of the impure crystals were dissolved in a total 250 cm^(3) water and dilute sulphuric acid. 25cm^(3) portion of this solution was titrated with a solution of potenssium bicarbonate. The concentration of dichromate (VI) ions in this solution was 0.1"mol"dm^(-3) . The averge volume used was 23.5cm^(3) o.2 mol dm^(-3) . The average volume used to 23.5cm^(3) . What mass of Fe^(+2) ions should have been present in the 4.2 gmiof crystalsl?

A sample of FeSO_(4).7H_(2)O crystals has been left open to the air and some of the iron (II) has been converted to iron (III). 4.2 gm of the impure crystals were dissolved in a total 250 cm^(3) water and dilute sulphuric acid. 25cm^(3) portion of this solution was titrated with a solution of potenssium bicarbonate. The concentration of dichromate (VI) ions in this solution was 0.1"mol"dm^(-3) . The averge volume used was 23.5cm^(3) o.2 mol dm^(-3) . The average volume used to 23.5cm^(3) . How many moles of Fe^(+2) ions would there havebeen in the 250 cm^(3) of stock solutio?

In an optical fibre, core and cladding were made with materials of refractive indices 1.5 and 1.414 respectively. To observe total internal reflection, what will be the range of incident angle with the axis of optical fibre?

Three electrolytic cells A,B,C containing solutions of ZnSO_(4) , AgNO_(3) and CuSO_(4) , respectively are connected in series. A steady current of 1.5 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited?

In a quiz positive marks were given for correct answers and negative marks for incorrect answers.If Guru's scores in five successive rounds were 35,-10,-15,-20 and 5,what is his total score at the end ?