Mortgage not to be questioned on insolvency of mortgagor

Notwithstanding anything contained in the Insolvency Act, 1955, a mortgage executed in favour of the Central Mortgage Bank or a primary mortgage bank, as the case may be, shall not be called in question on the ground that it was not executed in good faith for valuable consideration or on the ground that it was executed in order to give such mortgage bank a preference over the other creditors of the mortgagor.