Which of the following statements is not true?
- A$K_2Cr_2O_7$ solution in acidic medium is orange
- B$K_2Cr_2O_7$ solution becomes yellow on increasing the $pH$ beyond $7$
- COn passing $H_2S$ through acidified $K_2Cr_2O_7$ solution,a milky colour is observed
- D$Na_2Cr_2O_7$ is preferred over $K_2Cr_2O_7$ in volumetric analysis
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Four resistors $A, B, C$ and $D$ form a Wheatstone bridge as shown in the figure. The bridge is balanced when $C = 100 \Omega$. If $A$ and $B$ are interchanged,the bridge balances for $C = 121 \Omega$. The value of $D$ is (in $\Omega$)
The method of zone refining of metals is based on the principle of:
The approximate value of $(1.0002)^{3000}$ is
$A$ force of $(2\hat i + 3\hat j + 4\hat k) \; N$ acts on a body for $4 \; s$,producing a displacement of $(3\hat i + 4\hat j + 5\hat k) \; m$. The power used is ....... $W$. (in $.5$)
Match the following columns:
Column-$I$ Column-$II$ $a$. Superior Vena Cava $p$. Carries deoxygenated blood to the lungs $b$. Inferior Vena Cava $q$. Carries oxygenated blood to the heart $c$. Pulmonary Artery $r$. Brings deoxygenated blood from lower body parts to the right atrium $d$. Pulmonary Vein $s$. Brings deoxygenated blood from upper body parts to the right atrium
| Column-$I$ | Column-$II$ |
|---|---|
| $a$. Superior Vena Cava | $p$. Carries deoxygenated blood to the lungs |
| $b$. Inferior Vena Cava | $q$. Carries oxygenated blood to the heart |
| $c$. Pulmonary Artery | $r$. Brings deoxygenated blood from lower body parts to the right atrium |
| $d$. Pulmonary Vein | $s$. Brings deoxygenated blood from upper body parts to the right atrium |
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