In the 3d series of transition elements, the element more likely to exhibit +1 oxidation state is :

Which of the following classes of compounds on hydrolysis yields carboxylic acids?
(A) RCN
(B) \(RCONH_{2}\)
(C) RCOCl
(D) RCOOR'
Choose the \textbf\{correct answer\} from the options given below:

The unit of rate constant for -2.5 order reaction is:

Match List - I with List - II.

List - I (Process)	List - II (Metal)
A. Electrolytic reduction	I. Iron
B. Bessemerization	II. Zinc
C. Smelting	III. Aluminium
D. Reduction from oxide	IV. Copper

Choose the correct answer from the options given below:

Propene on addition with bromine in CCl4 gives

The purest form of commercial iron is

The product A is
\(\text{C}_6\text{H}_5\text{NH}_2 + \text{CHCl}_3 + \text{KOH (alc.)} \to \text{A}\)

Use of biocontrol measures greatly reduce our dependence on:

A 10 cm long air-core solenoid of cross-sectional area \( 1.0 \, \text{cm}^2 \) contains 300 turns. Its inductance is:

The statement which is not true -
(A) Boiling point of ethanol is greater than that of ethoxyethane due to H -bonding
(B) Ethoxyethane is soluble in water due to H-bonding
(C) Ethanol is soluble in water due to H -bonding
(D) Ethoxyethane has nearly same boiling point as that of butanol
Choose the correct answer from the options given below :

A telescope has an objective of focal length \(3 0 ~ c m\) and an eyepiece of focal length \(3 . 0 ~ c m\). It is focused on a scale distant 2.0 m . For seeing with relaxed eye, the separation between the objective and eyepiece would be:

A semiconductor device is connected in series circuit with a battery and resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops at almost zero. The device may be

Read the passage carefully and answer the questions based on the passage:
Pollen pistil interaction involves all events from the landing of pollen grains on the stigma until the pollen tube enters the embryo sac (when the pollen is compatible). When a pollen tube grows through the style and enters into the ovules, it finally discharges two male gametes in one of the synergids. Syngamy and triple fusion are two fusion events occur in angiosperms. Thus, angiosperms exhibit double fertilization. The products of these fusions are the diploid zygote and triploid primary endosperm nucleus. Zygote develops into embryo and primary endosperm cell forms the endosperm tissue. The developing embryo passes through different stages before maturation.
If there are 38 chromosomes in the zygote, how many chromosomes will be there in its haploid egg cell?