Fill in the blanks by selecting correct word/term given in the brackets.
The metal which does not react with water or dilute `H_2 SO_4` but reacts with concentrated `H_2 SO_4` is __________ (Al/Cu/Zn/Fe)

Complete the following by selecting the correct option from the choices given : The metal which does not react with water or dilute H_2SO_4 but reacts with concentrated H_2SO_4 is ________ .( Al//Cu//Zn//Fe )

Fill in the blanks by selecting correct word/term given in the brackets. Brass is an alloy of copper and __________ (zinc/tin)

Metal which does not react with cold water but evolves H_(2) with steam is :

Fill in the blanks by selecting correct word/term given in the brackets. An alloy of copper and tin is called __________ .(brass/bronze)

Fill in the blanks by selecting correct word/term given in the brackets. Zinc carbonate is converted into __________ by calcination. (ZnO/ZnS)

Fill in the blanks by using the correct word/term given in the brackets. The pH of water decreases when _____ is dissolved in it. (NH_(3)//SO_(2))

Fill in the blanks by selecting correct word/term given in the brackets. Froth floatation process is used to concentrate __________ ores. (oxide/sulphide)

Fill in the blanks by selecting correct word/term given in the brackets. Impure ____________ is used as anode in the electrolytic refining of copper. (zinc/copper)

Fill in the blanks by using the correct word/term given in the brackets. An acid _____ change the colour of phenolphthalein. (must/does not)

Which of the following react with dil H_(2)SO_(4) ?