Which of the following compounds is used as the starting material for the preparation of potassium dichromate?

What is the composition of the alloy that exhibits the property of shape memory?

Consider the following reactions:
$NaCl + K_{2}Cr_{2}O_{7} + H_{2}SO_{4}$ (conc.) $\rightarrow (A) +$ side products
$(A) + NaOH \rightarrow (B) +$ side product
$(B) + H_{2}SO_{4}$ (dilute) $+ H_{2}O_{2} \rightarrow (C) +$ side product
The sum of the total number of atoms in one molecule each of $(A)$,$(B)$,and $(C)$ is:

On heating $KMnO_4$,one among the following is not formed:

When a mixture of manganese dioxide,potassium hydroxide and potassium chlorate is fused,the product obtained is

Which of the following statements regarding copper salts is not true?